Belkin F1DN102MOD-BA-4, F1DN202MOD-BA- 4, F1DN104MOD-BA-4, F1DN204MOD-BA-4, F1DN108MOD-BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN102MOD-PP-4, F1DN102MOD-DD-4, F1DN202MOD-HH-4, F1DN202MOD-PP-4, F1DN202MOD-DD-4, F1DN104MOD-HH-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN104MOD-DD-4, F1DN204MOD-HH-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4, F1DN204MOD-DD-4, F1DN104MOD-XX-4, F1DN204MOD-XX-4 Firmware Version 44404-E7E7 Peripheral Sharing Devices Security Target Doc No: 2149-001-D102B2 Version: 1.6 8 July 2021 Belkin International, Inc. 12045 E. Waterfront Drive Playa Vista, CA 90094 USA Prepared by: EWA-Canada, An Intertek Company 1223 Michael Street North, Suite 200 Ottawa, Ontario, Canada K1J 7T2 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page i of v CONTENTS 1 SECURITY TARGET INTRODUCTION.............................................1 1.1 DOCUMENT ORGANIZATION........................................................... 1 1.2 SECURITY TARGET REFERENCE....................................................... 2 1.3 TOE REFERENCE........................................................................... 2 1.4 TOE OVERVIEW............................................................................ 2 Security Features ...........................................................................3 TOE Environment ...........................................................................5 1.5 TOE DESCRIPTION ....................................................................... 6 Evaluated Configuration ..................................................................6 Physical Scope ...............................................................................7 Logical Scope.................................................................................9 2 CONFORMANCE CLAIMS.............................................................10 2.1 COMMON CRITERIA CONFORMANCE CLAIM .................................... 10 2.2 PROTECTION PROFILE CONFORMANCE CLAIM................................. 10 2.3 PACKAGE CLAIM......................................................................... 11 2.4 MODULE CLAIM.......................................................................... 11 2.5 CONFORMANCE RATIONALE ......................................................... 11 3 SECURITY PROBLEM DEFINITION..............................................12 3.1 THREATS .................................................................................. 12 3.2 ORGANIZATIONAL SECURITY POLICIES ......................................... 13 3.3 ASSUMPTIONS........................................................................... 13 4 SECURITY OBJECTIVES..............................................................14 4.1 SECURITY OBJECTIVES FOR THE TOE ............................................ 14 4.2 SECURITY OBJECTIVES FOR THE OPERATIONAL ENVIRONMENT......... 18 4.3 SECURITY OBJECTIVES RATIONALE............................................... 19 5 EXTENDED COMPONENTS DEFINITION......................................24 5.1 CLASS FDP: USER DATA PROTECTION ........................................... 24 FDP_APC_EXT Active PSD Connections............................................24 FDP_CDS_EXT Connected Displays Supported..................................25 FDP_FIL_EXT Device Filtering ........................................................26 FDP_IPC_EXT Internal Protocol Conversion......................................27 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page ii of v FDP_PDC_EXT Peripheral Device Connection....................................27 FDP_RDR_EXT Re-Enumeration Device Rejection .............................29 FDP_RIP_EXT Residual Information Protection .................................30 FDP_SPR_EXT Sub-Protocol Rules ..................................................31 FDP_SWI_EXT PSD Switching ........................................................31 FDP_UDF_EXT Unidirectional Data Flow.........................................33 5.2 CLASS FPT: PROTECTION OF THE TSF ........................................... 33 FPT_FLS_EXT Failure with Preservation of Secure State ....................33 FPT_NTA_EXT No Access to TOE.....................................................34 FPT_TST_EXT TSF Testing .............................................................35 5.3 CLASS FTA: TOE ACCESS ............................................................ 35 FTA_CIN_EXT Continuous Indications .............................................35 6 SECURITY FUNCTIONAL REQUIREMENTS...................................37 6.1 CONVENTIONS AND APPLICABILITY .............................................. 37 Conventions ................................................................................37 Section Applicability......................................................................37 6.2 SECURITY FUNCTIONAL REQUIREMENTS FOR ALL DEVICES .............. 38 User Data Protection (FDP)............................................................40 Protection of the TSF (FPT)............................................................43 TOE Access (FTA).........................................................................44 6.3 ADDITIONAL SECURITY REQUIREMENTS FOR F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN108MOD-BA-4, F1DN102MOD-HH-4, F1DN104MOD- HH-4 44 User Data Protection (FDP)............................................................46 6.4 ADDITIONAL SECURITY REQUIREMENTS FOR F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN208MOD-BA-4, F1DN202MOD-HH-4, F1DN204MOD- HH-4 47 User Data Protection (FDP)............................................................48 6.5 ADDITIONAL SECURITY REQUIREMENTS FOR F1DN102MOD-PP-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4................................................... 49 User Data Protection (FDP)............................................................50 6.6 ADDITIONAL SECURITY REQUIREMENTS FOR F1DN102MOD-DD-4, F1DN104MOD-DD-4 .............................................................................. 52 User Data Protection (FDP)............................................................53 6.7 ADDITIONAL SECURITY REQUIREMENTS FOR F1DN202MOD-PP-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4................................................... 53 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page iii of v User Data Protection (FDP)............................................................55 6.8 ADDITIONAL SECURITY REQUIREMENTS FOR F1DN202MOD-DD-4, F1DN204MOD-DD-4 .............................................................................. 56 User Data Protection (FDP)............................................................57 6.9 ADDITIONAL SECURITY REQUIREMENTS FOR F1DN104MOD-XX-4...... 57 User Data Protection (FDP)............................................................59 6.10 ADDITIONAL SECURITY REQUIREMENTS FOR F1DN204MOD-XX-4...... 61 User Data Protection (FDP) ..........................................................63 7 SECURITY ASSURANCE REQUIREMENTS ....................................66 8 SECURITY REQUIREMENTS RATIONALE.....................................67 8.1 SECURITY FUNCTIONAL REQUIREMENTS RATIONALE ....................... 67 8.2 DEPENDENCY RATIONALE............................................................ 67 8.3 SECURITY ASSURANCE REQUIREMENTS RATIONALE ........................ 68 9 TOE SUMMARY SPECIFICATION.................................................69 9.1 USER DATA PROTECTION ............................................................ 69 System Controller ........................................................................69 Keyboard and Mouse Functionality..................................................70 Video Switching Functionality.........................................................72 9.2 PROTECTION OF THE TSF ............................................................ 76 No Access to TOE .........................................................................76 Anti-tampering Functionality..........................................................77 TSF Testing .................................................................................77 9.3 TOE ACCESS.............................................................................. 77 Continuous Indications..................................................................77 Wired Remote Control...................................................................78 10 TERMINOLOGY AND ACRONYMS ................................................79 10.1 TERMINOLOGY........................................................................... 79 10.2 ACRONYMS................................................................................ 79 11 REFERENCES..............................................................................81 ANNEX A – LETTER OF VOLATILITY .................................................... A-1 ANNEX B – SFR DEVICE MATRIX......................................................... B-1 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page iv of v LIST OF TABLES Table 1 – Non-TOE Hardware and Software................................................. 5 Table 2 – TOE Peripheral Sharing Devices and Features ................................ 7 Table 3 – Remote Control Devices ............................................................. 8 Table 4 – Modular Secure KVM Series Models and Cables .............................. 8 Table 5 – Logical Scope of the TOE .......................................................... 10 Table 6 – Applicable Technical Decisions ................................................... 11 Table 7 – Threats.................................................................................. 12 Table 8 – Assumptions........................................................................... 13 Table 9 – Security Objectives for the TOE ................................................. 18 Table 10 – Security Objectives for the Operational Environment ................... 19 Table 11 – Security Objectives Rationale .................................................. 23 Table 12 – Functional Families of Extended Components ............................. 24 Table 13 – Devices and Applicable Sections............................................... 38 Table 14 – Summary of Security Functional Requirements........................... 40 Table 15 – Summary of Additional Security Functional Requirements for F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN108MOD-BA-4, F1DN102MOD-HH-4 and F1DN104MOD-HH-4 ....................................... 45 Table 16 – Summary of Additional Security Functional Requirements for F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN208MOD-BA-4 and F1DN204MOD-HH-4 ......................................................................... 48 Table 17 – Summary of Additional Security Functional Requirements for F1DN102MOD-PP-4, F1DN104MOD-PP-4 and F1DN108MOD-PP-4............. 50 Table 18 – Summary of Additional Security Functional Requirements for F1DN102MOD-DD-4 and F1DN104MOD-DD-4 ....................................... 52 Table 19 – Summary of Additional Security Functional Requirements for F1DN202MOD-PP-4, F1DN204MOD-PP-4 and F1DN208MOD-PP-4............. 54 Table 20 – Summary of Additional Security Functional Requirements for F1DN202MOD-DD-4 and F1DN204MOD-DD-4 ....................................... 56 Table 21 – Summary of Additional Security Functional Requirements for F1DN104MOD-XX-4.......................................................................... 59 Table 22 – Summary of Additional Security Functional Requirements for F1DN204MOD-XX-4.......................................................................... 63 Table 23 – Security Assurance Requirements............................................. 66 Table 24 – Functional Requirement Dependencies ...................................... 68 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page v of v Table 25 – Terminology ......................................................................... 79 Table 26 – Acronyms............................................................................. 80 Table 27 – References ........................................................................... 81 Table 28 – Security Functional Requirements and Devices .......................... B-2 LIST OF FIGURES Figure 1 – Simplified Switching Diagram..................................................... 5 Figure 2 – KVM Switch Evaluated Configuration ........................................... 6 Figure 3 – Display EDID Read Function..................................................... 72 Figure 4 – Display EDID Write Function .................................................... 73 Figure 5 – Display Normal Mode .............................................................. 74 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 1 of 81 1 SECURITY TARGET INTRODUCTION This Security Target (ST) defines the scope of the evaluation in terms of the assumptions made, the intended environment for the Target of Evaluation (TOE), the Information Technology (IT) security functional and assurance requirements to be met, and the level of confidence (evaluation assurance level) to which it is asserted that the TOE satisfies its IT security requirements. This document forms the baseline for the Common Criteria (CC) evaluation. 1.1 DOCUMENT ORGANIZATION Section 1, ST Introduction, provides the Security Target reference, the Target of Evaluation reference, the TOE overview and the TOE description. Section 2, Conformance Claims, describes how the ST conforms to the Common Criteria, Protection Profile (PP) and PP Modules. Section 3, Security Problem Definition, describes the expected environment in which the TOE is to be used. This section defines the set of threats that are relevant to the secure operation of the TOE, organizational security policies with which the TOE must comply, and secure usage assumptions applicable to this analysis. Section 4, Security Objectives, defines the set of security objectives to be satisfied by the TOE and by the TOE operating environment in response to the problem defined by the security problem definition. Section 5, Extended Components Definition, defines the extended components which are then detailed in Section 6. Section 6, Security Functional Requirements, specifies the security functional requirements that must be satisfied by the TOE and the IT environment. Section 7, Security Assurance Requirements, specifies the security assurance requirements that must be satisfied by the TOE and the IT environment. Section 8, Security Requirements Rationale, provides a rationale for the selection of functional and assurance requirements. Section 9, TOE Summary Specification, describes the security functions that are included in the TOE to enable it to meet the IT security functional requirements. Section 10, Terminology and Acronyms, defines the acronyms and terminology used in this ST. Section 11, References, provides a list of documents referenced in this ST. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 2 of 81 1.2 SECURITY TARGET REFERENCE ST Title: Belkin F1DN102MOD-BA-4, F1DN202MOD- BA-4, F1DN104MOD-BA-4, F1DN204MOD- BA-4, F1DN108MOD- BA-4, F1DN208MOD- BA-4, F1DN102MOD-HH-4, F1DN102MOD-PP-4, F1DN102MOD-DD-4, F1DN202MOD-HH-4, F1DN202MOD-PP-4, F1DN202MOD-DD-4, F1DN104MOD-HH-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN104MOD-DD-4, F1DN204MOD-HH-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4, F1DN204MOD-DD-4, F1DN104MOD-XX-4, F1DN204MOD-XX-4 Firmware Version 44404-E7E7 Peripheral Sharing Devices Security Target ST Version: 1.6 ST Date: 8 July 2021 1.3 TOE REFERENCE TOE Identification: Belkin F1DN102MOD-BA-4, F1DN202MOD-BA-4, F1DN104MOD-BA-4, F1DN204MOD-BA-4, F1DN108MOD-BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN102MOD-PP-4, F1DN102MOD-DD-4, F1DN202MOD-HH-4, F1DN202MOD-PP-4, F1DN202MOD-DD-4, F1DN104MOD-HH-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN104MOD-DD-4, F1DN204MOD-HH-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4, F1DN204MOD-DD-4, F1DN104MOD-XX-4, F1DN204MOD-XX-4 Firmware Version 44404-E7E7 Peripheral Sharing Devices TOE Developer: Belkin International, Inc. TOE Type: Peripheral Sharing Device (Other Devices and Systems) 1.4 TOE OVERVIEW The Belkin Secure Peripheral Sharing Devices are part of the Modular Secure KVM Series product line. These KVMs are modular KVM switches that support keyboard, mouse and video switching only. The units natively support High- Definition Multimedia Interface (HDMI) for switching, but also support DisplayPort, Digital Visual Interface -D (DVI-D), Video Graphics Array (VGA) and Universal Serial Bus Type C (USB-Type C) with DisplayPort as an alternate function video protocols through the use of proprietary cables. For devices that Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 3 of 81 support DisplayPort, DVI-D, VGA and USB-Type C, the cables convert the source protocol to HDMI. The cables are considered to be part of the TOE. A breakdown of the models, base model and cables may be found in Table 4, below. Security Features The Belkin Secure Keyboard, Video, Mouse (KVM) Switches allow users to share keyboard, video, and mouse peripherals between a number of connected computers. Security features ensure isolation between computers and peripherals to prevent data leakage between connected systems. The following security features are provided by the Belkin Peripheral Sharing Devices (PSDs): • Video Security • Computer video input interfaces are isolated through the use of separate electronic components, power and ground domains • The display is isolated by dedicated, read-only, Extended Display Identification Data (EDID) emulation for each computer • Access to the monitor’s EDID is blocked • Access to the Monitor Control Command Set (MCCS commands) is blocked • Both DisplayPort and High-Definition Multimedia Interface (HDMI) video is supported • Various video input protocols are supported:  HDMI is supported on the F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN202MOD-BA-4, F1DN204MOD-BA- 4, F1DN108MOD-BA-4, F1DN208MOD-BA-4, F1DN102MOD- HH-4, F1DN202MOD-HH-4, F1DN104MOD-HH-4, F1DN204MOD-HH-4, F1DN104MOD-XX-4 and F1DN204MOD- XX-4 models  DisplayPort is supported on the F1DN102MOD-PP-4, F1DN202MOD-PP-4, F1DN104MOD-PP-4, F1DN108MOD-PP- 4, F1DN204MOD-PP-4, F1DN208MOD-PP-4, F1DN104MOD- XX-4 and F1DN204MOD-XX-4 models  DVI-D is supported on the F1DN102MOD-DD-4, F1DN202MOD-DD-4, F1DN104MOD-DD-4, F1DN204MOD- DD-4 and F1DN204MOD-XX-4 models  VGA is supported on the F1DN104MOD-XX-4 model  USB Type C with DisplayPort as an alternate function is supported on the F1DN104MOD-XX-4 and F1DN204MOD-XX- 4 models • Various video peripheral types are supported: Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 4 of 81  DisplayPort peripherals are supported on the F1DN202MOD- PP-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4, F1DN104MOD-XX-4 and F1DN204MOD-XX-4 models  HDMI peripherals are supported on the F1DN102MOD-BA-4, F1DN202MOD-BA-4, F1DN104MOD-BA-4, F1DN204MOD-BA- 4, F1DN108MOD-BA-4, F1DN208MOD-BA-4, F1DN102MOD- HH-4, F1DN202MOD-HH-4, F1DN104MOD-HH-4, F1DN204MOD-HH-4, F1DN104MOD-XX-4 and F1DN204MOD- XX-4 models  DVI-D peripherals are supported on the F1DN102MOD-DD-4, F1DN202MOD-DD-4, and F1DN104MOD-DD-4 models • Keyboard and Mouse Security • The keyboard and mouse are isolated by dedicated, USB device emulation for each computer • One-way, peripheral-to-computer data flow is enforced through unidirectional optical data diodes • Communication from computer-to-keyboard/mouse is blocked • Non HID (Human Interface Device) data transactions are blocked • Hardware Anti-Tampering • Special holographic tampering evident labels on the product’s enclosure provide a clear visual indication if the product has been opened or compromised Belkin secure peripheral sharing devices use multiple isolated microcontrollers (one microcontroller per connected computer) to emulate connected peripherals in order to prevent display signaling, keyboard signaling, and power signaling attacks. Figure 1 is a simplified block diagram showing the TOE keyboard and mouse data path for two ports. A Host Emulator (HE) communicates with the user keyboard via the USB protocol. The Host Emulator converts user key strokes into unidirectional serial data. That unidirectional serial data is passed through the switch that is used to select between Computer A and Computer B. Isolated Device Emulators (DE) are connected to the data switch on one side and to the respective computers on the other side. Each key stroke is converted by the selected DE into a bi-directional stream to communicate with the computer. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 5 of 81 Figure 1 – Simplified Switching Diagram The TOE is a combined software and hardware TOE. A mapping showing the applicable Security Functional Requirements (SFRs) for each device is included in Annex B. TOE Environment The following components are required for operation of the TOE in the evaluated configuration. Component Description Connected Computers 2-8 General purpose computers Mouse General purpose USB mouse User display Standard computer display (HDMI 2.0, DVI-D, or DisplayPort 1.1, 1.2 or 1.3) Belkin KVM Cables USB Type-A to USB Type-B (mouse) Video cable (DisplayPort, DVI-D, VGA, USB-C and HDMI) Table 1 – Non-TOE Hardware and Software Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 6 of 81 1.5 TOE DESCRIPTION Evaluated Configuration Figure 2 – KVM Switch Evaluated Configuration Figure 2 shows a basic evaluated configuration. The TOE is connected to two or four computers. The base units support HDMI switching. The devices support HDMI, DisplayPort, USB-C or VGA video input. The video format is converted using proprietary cables purchased with the base unit. One or two displays are supported, and may be DisplayPort, HDMI or DVI-D. The TOE devices are used with the Belkin 2-4-8 Port Secure USB Keyboard w/Lighting remote control. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 7 of 81 Physical Scope The TOE consists of the devices shown in Table 2 and Table 3. Family Family Description Part Number Model Tamper Evident labels Video in Video out Number of supported displays KM Modular Secure KVM Series KVMs Secure KVM devices CGA18717 F1DN102MOD-BA-4 Yes Note 1 Note 1 1 Yes CGA18715 F1DN104MOD-BA-4 Yes Note 1 Note 1 1 Yes CGA18718 F1DN202MOD-BA-4 Yes Note 1 Note 1 2 Yes CGA18247 F1DN204MOD-BA-4 Yes Note 1 Note 1 2 Yes CGA22661 F1DN108MOD-BA-4 Yes Note 1 Note 1 1 Yes CGA22662 F1DN208MOD-BA-4 Yes Note 1 Note 1 2 Yes CGA19157 F1DN102MOD-HH-4 Yes HDMI HDMI 1 Yes CGA19159 F1DN102MOD-PP-4 Yes DisplayPort DisplayPort 1 Yes CGA19161 F1DN102MOD-DD-4 Yes DVI-D DVI-D 1 Yes CGA19162 F1DN202MOD-HH-4 Yes HDMI HDMI 2 Yes CGA19164 F1DN202MOD-PP-4 Yes DisplayPort DisplayPort 2 Yes CGA19167 F1DN202MOD-DD-4 Yes DVI-D DVI-D 2 Yes CGA19169 F1DN104MOD-HH-4 Yes HDMI HDMI 1 Yes CGA19170 F1DN104MOD-PP-4 Yes DisplayPort DisplayPort 1 Yes CGA22318 F1DN108MOD-PP-4 Yes DisplayPort DisplayPort 1 Yes CGA19173 F1DN104MOD-DD-4 Yes DVI-D DVI-D 1 Yes CGA19174 F1DN204MOD-HH-4 Yes HDMI HDMI 2 Yes CGA19177 F1DN204MOD-PP-4 Yes DisplayPort DisplayPort 2 Yes CGA22319 F1DN208MOD-PP-4 Yes DisplayPort DisplayPort 2 Yes CGA19179 F1DN204MOD-DD-4 Yes DVI-D DVI-D 2 Yes CGA19186 F1DN104MOD-XX-4 Yes VGA, USB-C, DisplayPort, HDMI HDMI 1 Yes CGA19187 F1DN204MOD-XX-4 Yes DVI-D, USB-C, DisplayPort, HDMI HDMI 1 Yes Table 2 – TOE Peripheral Sharing Devices and Features Note 1: This is a Modular Secure KVM Series base model. Video in and video out support depends upon the cables selected for use with the device. Internal switching is performed using HDMI. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 8 of 81 Description Part Number Model Belkin 2-4-8 Port Secure USB Keyboard W/Lighting CGA201664 F1DN008KBD Table 3 – Remote Control Devices Table 4 shows the Modular Secure KVM Series models included in the evaluation. The HDMI (HH), DisplayPort (PP) and DVI-D (DD) models are made up of the Base Unit (BA) and the cables required to support the video protocol. Part Number Model Base Unit Host Cable Console Cable CGA19157 F1DN102MOD-HH-4 F1DN102MOD-BA-4 F1DN1MOD-HC-H06 F1DN1MOD-CC-H06 CGA19159 F1DN102MOD-PP-4 F1DN102MOD-BA-4 F1DN1MOD-HC-P06 F1DN1MOD-CC-P06 CGA19161 F1DN102MOD-DD-4 F1DN102MOD-BA-4 F1DN1MOD-HC-D06 F1DN1MOD-CC-D06 CGA19162 F1DN202MOD-HH-4 F1DN202MOD-BA-4 F1DN2MOD-HC-H06 F1DN2MOD-CC-H06 CGA19164 F1DN202MOD-PP-4 F1DN202MOD-BA-4 F1DN2MOD-HC-P06 F1DN2MOD-CC-P06 CGA19167 F1DN202MOD-DD-4 F1DN202MOD-BA-4 F1DN2MOD-HC-D06 F1DN2MOD-CC-D06 CGA19169 F1DN104MOD-HH-4 F1DN104MOD-BA-4 F1DN1MOD-HC-H06 F1DN1MOD-CC-H06 CGA19170 F1DN104MOD-PP-4 F1DN104MOD-BA-4 F1DN1MOD-HC-P06 F1DN1MOD-CC-P06 CGA22318 F1DN108MOD-PP-4 F1DN108MOD-BA-4 F1DN1MOD-HC-P06 F1DN1MOD-CC-P06 CGA19173 F1DN104MOD-DD-4 F1DN104MOD-BA-4 F1DN1MOD-HC-D06 F1DN1MOD-CC-D06 CGA19174 F1DN204MOD-HH-4 F1DN204MOD-BA-4 F1DN2MOD-HC-H06 F1DN2MOD-CC-H06 CGA19177 F1DN204MOD-PP-4 F1DN204MOD-BA-4 F1DN2MOD-HC-P06 F1DN2MOD-CC-P06 CGA22319 F1DN208MOD-PP-4 F1DN208MOD-BA-4 F1DN2MOD-HC-P06 F1DN2MOD-CC-P06 CGA19179 F1DN204MOD-DD-4 F1DN204MOD-BA-4 F1DN2MOD-HC-D06 F1DN2MOD-CC-D06 CGA19186 F1DN104MOD-XX-4 F1DN104MOD-BA-4 F1DN1MOD-HC-V06 F1DN1MOD-HC-U03 F1DN1MOD-HC-H06 F1DN1MOD-HC-P06 F1DN1MOD-CC-H06 CGA19187 F1DN204MOD-XX-4 F1DN204MOD-BA-4 F1DN2MOD-HC-V06 F1DN2MOD-HC-U03 F1DN2MOD-HC-H06 F1DN2MOD-HC-P06 F1DN2MOD-CC-H06 Table 4 – Modular Secure KVM Series Models and Cables Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 9 of 81 1.5.2.1 TOE Delivery The TOE, together with its corresponding cables are delivered to the customer via trusted carrier, such as Fed-Ex, that provide a tracking service for all shipments. 1.5.2.2 TOE Guidance The TOE includes the following guidance documentation: • Quick Installation Guide 2/4/8 Port Single/Dual-Head Modular Secure KVM Switches, 8820-02949 Rev.B00 o https://www.belkin.com/support/assets/belkin/qig/Quick%20Install ation%20Guide%202_4_8%20Port%20Single_Dual- Head%20Modular%20Secure%20KVM%20Switches%2C%208820- 02949%20Rev.B00.pdf • Belkin Regulatory Information, 8820-02969 Rev. A00 o https://www.belkin.com/support/assets/belkin/others/Belkin%20Re gulatory%20Information%2C%208820-02969%20Rev.%20A00.pdf Guidance may be downloaded from the Belkin website (www.belkin.com) in .pdf format from the indicated locations. The following guidance is available upon request by emailing support@highseclabs.com: • Belkin F1DN102MOD-BA-4, F1DN202MOD-BA-4, F1DN104MOD-BA-4, F1DN204MOD-BA-4, F1DN108MOD-BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN102MOD-PP-4, F1DN102MOD-DD-4, F1DN202MOD-HH-4, F1DN202MOD-PP-4, F1DN202MOD-DD-4, F1DN104MOD-HH-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN104MOD-DD-4, F1DN204MOD-HH-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4, F1DN204MOD-DD-4, F1DN104MOD-XX-4, F1DN204MOD-XX-4 Firmware Version 44404-E7E7 Peripheral Sharing Devices Common Criteria Guidance Supplement, Version 1.2 Logical Scope The logical boundary of the TOE includes all interfaces and functions within the physical boundary. The logical boundary of the TOE may be broken down by the security function classes described in Section 6. Table 5 summarizes the logical scope of the TOE. Functional Classes Description User Data Protection The TOE provides secure switching capabilities for keyboard, video and mouse. The TOE ensures that only authorized peripheral devices may be used. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 10 of 81 Functional Classes Description Protection of the TSF1 The TOE ensures a secure state in the case of failure, provides only restricted access, and performs self-testing. The TOE provides passive detection of physical attack. TOE Access The TOE provides a continuous indication of which computer is currently selected. Table 5 – Logical Scope of the TOE 2 CONFORMANCE CLAIMS 2.1 COMMON CRITERIA CONFORMANCE CLAIM This Security Target claims to be conformant to Version 3.1 of Common Criteria for Information Technology Security Evaluation according to: • Common Criteria for Information Technology Security Evaluation, Part 1: Introduction and General Model; CCMB-2017-04-001, Version 3.1, Revision 5, April 2017 • Common Criteria for Information Technology Security Evaluation, Part 2: Security Functional Components; CCMB-2017-04-002, Version 3.1, Revision 5, April 2017 • Common Criteria for Information Technology Security Evaluation, Part 3: Security Assurance Components CCMB-2017-04-003, Version 3.1, Revision 5, April 2017 As follows: • CC Part 2 extended • CC Part 3 conformant The Common Methodology for Information Technology Security Evaluation, Version 3.1, Revision 5, April 2017 has been taken into account. 2.2 PROTECTION PROFILE CONFORMANCE CLAIM This ST claims exact conformance with the National Information Assurance Partnership (NIAP) PP‐Configuration for Peripheral Sharing Device, Keyboard/Mouse Devices, and Video/Display Devices [CFG_PSD‐KM‐VI_V1.0], which references the Protection Profile for Peripheral Sharing Device Version 4.0 [PP_PSD_V4.0], and the modules listed in Section 2.4. The Technical Decisions 1 TOE Security Functionality Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 11 of 81 in Table 6 apply to the PP and the modules and have been accounted for in the ST and in the evaluation. Technical Decision PP or Module TD0506 [MOD_VI_V1.0] TD0507 [MOD_KM_V1.0] TD0514 [MOD_VI_V1.0] TD0518 [PP_PSD_V4.0] TD0539 [MOD_VI_V1.0] TD0583 [PP_PSD_V4.0] TD0584 [MOD_VI_V1.0] TD0586 [MOD_VI_V1.0] TD0593 [MOD_KM_V1.0], [MOD_VI_V1.0] Table 6 – Applicable Technical Decisions 2.3 PACKAGE CLAIM This Security Target does not claim conformance with any package. 2.4 MODULE CLAIM The following PP‐Modules are specified in a PP‐Configuration with this PP: • PP‐Module for Keyboard/Mouse Devices, Version 1.0 • PP‐Module for Video/Display Devices, Version 1.0 2.5 CONFORMANCE RATIONALE The TOE modular Keyboard, Video, Mouse (KVM) switches are inherently consistent with the Compliant Targets of Evaluation described in the [PP_PSD_V4.0] and in the PP modules listed in Section 2.4, and with the PP‐ Configuration for Peripheral Sharing Device, Keyboard/Mouse Devices, and Video/Display Devices [CFG_PSD‐KM‐VI_V1.0]. The security problem definition, statement of security objectives and statement of security requirements in this ST conform exactly to the security problem definition, statement of security objectives and statement of security requirements contained in [PP_PSD_V4.0] and the modules listed in Section 2.4. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 12 of 81 3 SECURITY PROBLEM DEFINITION 3.1 THREATS Table 7 lists the threats described in Section 3.1 of the [PP_PSD_V4.0]. Mitigation to the threats is through the objectives identified in Section 4.1, Security Objectives for the TOE. Threat Description T.DATA_LEAK A connection via the PSD between one or more computers may allow unauthorized data flow through the PSD or its connected peripherals. T.SIGNAL_LEAK A connection via the PSD between one or more computers may allow unauthorized data flow through bit‐by‐bit signaling. T.RESIDUAL_LEAK A PSD may leak (partial, residual, or echo) user data between the intended connected computer and another unintended connected computer. T.UNINTENDED_USE A PSD may connect the user to a computer other than the one to which the user intended to connect. T.UNAUTHORIZED_DEVICES The use of an unauthorized peripheral device with a specific PSD peripheral port may allow unauthorized data flows between connected devices or enable an attack on the PSD or its connected computers. T.LOGICAL_TAMPER An attached device (computer or peripheral) with malware, or otherwise under the control of a malicious user, could modify or overwrite code or data stored in the PSD’s volatile or non‐volatile memory to allow unauthorized information flows. T.PHYSICAL_TAMPER A malicious user or human agent could physically modify the PSD to allow unauthorized information flows. T.REPLACEMENT A malicious human agent could replace the PSD during shipping, storage, or use with an alternate device that does not enforce the PSD security policies. T.FAILED Detectable failure of a PSD may cause an unauthorized information flow or weakening of PSD security functions. Table 7 – Threats Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 13 of 81 3.2 ORGANIZATIONAL SECURITY POLICIES There are no Organizational Security Policies applicable to this TOE. 3.3 ASSUMPTIONS The assumptions required to ensure the security of the TOE are listed in Table 8. Assumptions Description A.NO_TEMPEST Computers and peripheral devices connected to the PSD are not TEMPEST approved. The TSF may or may not isolate the ground of the keyboard and mouse computer interfaces (the USB ground). The Operational Environment is assumed not to support TEMPEST red‐black ground isolation. A.PHYSICAL The environment provides physical security commensurate with the value of the TOE and the data it processes and contains. A.NO_WIRELESS_DEVICES The environment includes no wireless peripheral devices. A.TRUSTED_ADMIN PSD Administrators and users are trusted to follow and apply all guidance in a trusted manner. A.TRUSTED_CONFIG Personnel configuring the PSD and its operational environment follow the applicable security configuration guidance. A.USER_ALLOWED_ACCESS All PSD users are allowed to interact with all connected computers. It is not the role of the PSD to prevent or otherwise control user access to connected computers. Computers or their connected network shall have the required means to authenticate the user and to control access to their various resources. A.NO_SPECIAL_ANALOG _CAPABILITIES The computers connected to the TOE are not equipped with special analog data collection cards or peripherals such as analog to digital interface, high performance audio interface, digital signal processing function, or analog video capture function. Table 8 – Assumptions Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 14 of 81 4 SECURITY OBJECTIVES The purpose of the security objectives is to address the security concerns and to show which security concerns are addressed by the TOE, and which are addressed by the environment. Threats may be addressed by the TOE or the security environment or both. Therefore, the CC identifies two categories of security objectives: • Security objectives for the TOE • Security objectives for the environment 4.1 SECURITY OBJECTIVES FOR THE TOE This section identifies and describes the security objectives that are to be addressed by the TOE, and traces each Security Functional Requirement (SFR) back to a security objective of the TOE. Security Objective Description O.COMPUTER _INTERFACE _ISOLATION The PSD shall prevent unauthorized data flow to ensure that the PSD and its connected peripheral devices cannot be exploited in an attempt to leak data. The TOE‐Computer interface shall be isolated from all other PSD‐Computer interfaces while TOE is powered. Addressed by: MOD_VI FDP_APC_EXT.1/VI, FDP_PDC_EXT.1 MOD_KM FDP_APC_EXT.1/KM, FDP_FIL_EXT.1/KM, FDP_PDC_EXT.1, FDP_RDR_EXT.1, FDP_SWI_EXT.3 O.COMPUTER _INTERFACE _ISOLATION _TOE_UNPOWERED The PSD shall not allow data to transit a PSD‐Computer interface while the PSD is unpowered. Addressed by: MOD_VI FDP_APC_EXT.1/VI, FDP_PDC_EXT.1 MOD_KM FDP_APC_EXT.1/KM, FDP_FIL_EXT.1/KM, FDP_PDC_EXT.1, FDP_RDR_EXT.1, FDP_SWI_EXT.3 O.USER_DATA _ISOLATION The PSD shall route user data, such as keyboard entries, only to the computer selected by the user. The PSD shall provide isolation between the data flowing from the peripheral device to the selected computer and any non‐selected computer. Addressed by: MOD_VI FDP_APC_EXT.1/VI, FDP_PDC_EXT.1 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 15 of 81 Security Objective Description MOD_KM FDP_APC_EXT.1/KM, FDP_FIL_EXT.1/KM, FDP_PDC_EXT.1, FDP_RDR_EXT.1, FDP_SWI_EXT.3 O.NO_USER _DATA_RETENTION The PSD shall not retain user data in non‐volatile memory after power up or, if supported, factory reset. Addressed by: PP_PSD FDP_RIP_EXT.1 MOD_KM FDP_RIP.1/KM O.NO_OTHER _EXTERNAL _INTERFACES The PSD shall not have any external interfaces other than those implemented by the TSF. Addressed by: PP_PSD FDP_PDC_EXT.1 O.LEAK _PREVENTION _SWITCHING The PSD shall ensure that there are no switching mechanisms that allow signal data leakage between connected computers. Addressed by: PP_PSD FDP_SWI_EXT.1, FDP_SWI_EXT.2 O.AUTHORIZED _USAGE The TOE shall explicitly prohibit or ignore unauthorized switching mechanisms, either because it supports only one connected computer or because it allows only authorized mechanisms to switch between connected computers. Authorized switching mechanisms shall require express user action restricted to console buttons, console switches, console touch screen, wired remote control, and peripheral devices using a guard. Unauthorized switching mechanisms include keyboard shortcuts, also known as “hotkeys,” automatic port scanning, control through a connected computer, and control through keyboard shortcuts. Where applicable, the results of the switching activity shall be indicated by the TSF so that it is clear to the user that the switching mechanism was engaged as intended. A conformant TOE may also provide a management function to configure some aspects of the TSF. If the TOE provides this functionality, it shall ensure that whatever management functions it provides can only be performed by authorized administrators and that an audit trail of management activities is generated. Addressed by: Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 16 of 81 Security Objective Description PP_PSD FDP_SWI_EXT.1, FDP_SWI_EXT.2, FTA_CIN_EXT.1 MOD_VI FDP_CDS_EXT.1(1), FDP_CDS_EXT.1(2), FTA_CIN_EXT.1 MOD_KM FDP_FIL_EXT.1/KM O.PERIPHERAL _PORTS_ISOLATION The PSD shall ensure that data does not flow between peripheral devices connected to different PSD interfaces. Addressed by: MOD_VI FDP_APC_EXT.1/VI, FDP_PDC_EXT.1 MOD_KM FDP_APC_EXT.1/KM, FDP_FIL_EXT.1/KM, FDP_PDC_EXT.1, FDP_RDR_EXT.1, FDP_SWI_EXT.3 O.REJECT _UNAUTHORIZED _PERIPHERAL The PSD shall reject unauthorized peripheral device types and protocols. Addressed by: PP_PSD FDP_PDC_EXT.1 MOD_VI FDP_PDC_EXT.2/VI, FDP_PDC_EXT.3/VI, FDP_IPC_EXT.1, FDP_SPR_EXT.1/DP, SPR_EXT.1/DVI-D, FDP_SPR_EXT.1/HDMI, FDP_SPR_EXT.1/USB, FDP_SPR_EXT.1/VGA MOD_KM FDP_APC_EXT.1/KM, FDP_FIL_EXT.1/KM, FDP_PDC_EXT.1, FDP_RDR_EXT.1, FDP_SWI_EXT.3, FDP_PDC_EXT.2/KM, FDP_PDC_EXT.3/KM O.REJECT _UNAUTHORIZED _ENDPOINTS The PSD shall reject unauthorized peripheral devices connected via a Universal Serial Bus (USB) hub. Addressed by: PP_PSD FDP_PDC_EXT.1 MOD_KM FDP_APC_EXT.1/KM, FDP_FIL_EXT.1/KM, FDP_PDC_EXT.1, FDP_RDR_EXT.1, FDP_SWI_EXT.3 O.NO_TOE_ACCESS The PSD firmware, software, and memory shall not be accessible via its external ports. Addressed by: Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 17 of 81 Security Objective Description PP_PSD FPT_NTA_EXT.1 O.TAMPER _EVIDENT _LABEL The PSD shall be identifiable as authentic by the user and the user must be made aware of any procedures or other such information to accomplish authentication. This feature must be available upon receipt of the PSD and continue to be available during the PSD deployment. The PSD shall be labeled with at least one visible unique identifying tamper‐ evident marking that can be used to authenticate the device. The PSD manufacturer must maintain a complete list of manufactured PSD articles and their respective identification markings’ unique identifiers. Addressed by: PP_PSD FPT_PHP.1 O.ANTI_TAMPERING The PSD shall be physically enclosed so that any attempts to open or otherwise access the internals or modify the connections of the PSD would be evident, and optionally thwarted through disablement of the TOE. Note: This applies to a wired remote control as well as the main chassis of the PSD. Addressed by: PP_PSD FPT_PHP.1 O.SELF_TEST The PSD shall perform self‐tests following power up or powered reset. Addressed by: PP_PSD FPT_TST.1 O.SELF_TEST _FAIL_TOE _DISABLE The PSD shall enter a secure state upon detection of a critical failure. Addressed by: PP_PSD FPT_FLS_EXT.1, FPT_TST_EXT.1 O.SELF_TEST _FAIL_INDICATION The PSD shall provide clear and visible user indications in the case of a self‐test failure. Addressed by: PP_PSD FPT_TST_EXT.1 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 18 of 81 Security Objective Description O.PROTECTED _EDID The TOE shall read the connected display Extended Display Identification Data (EDID) once during the TOE power up or reboot sequence and prevent any EDID channel write transactions that connected computers initiate. Addressed by: MOD_VI FDP_PDC_EXT.2/VI, FDP_SPR_EXT.1/DP, FDP_SPR_EXT.1/DVI-D, FDP_SPR_EXT.1/HDMI, FDP_SPR_EXT.1/USB, FDP_SPR_EXT.1/VGA O.UNIDIRECTIONAL _VIDEO The TOE shall enforce unidirectional video data flow from the connected computer video interface to the display interface only. Addressed by: MOD_VI FDP_UDF_EXT.1/VI O.EMULATED_INPUT The TOE shall emulate the keyboard and/or mouse functions from the TOE to the connected computer. Addressed by: MOD_KM FDP_PDC_EXT.2/KM, FDP_PDC_EXT.3/KM O.UNIDIRECTIONAL _INPUT The TOE shall enforce unidirectional keyboard and/or mouse device’s data flow from the peripheral device to only the selected computer. Addressed by: MOD_KM FDP_UDF_EXT.1/KM Table 9 – Security Objectives for the TOE 4.2 SECURITY OBJECTIVES FOR THE OPERATIONAL ENVIRONMENT This section identifies and describes the security objectives that are to be addressed by the IT environment or by non-technical or procedural means. Security Objective Description OE.NO_TEMPEST The operational environment will not use TEMPEST approved equipment. OE.PHYSICAL The operational environment will provide physical security, commensurate with the value of the PSD and the data that transits it. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 19 of 81 OE.NO_WIRELESS_DEVICES The operational environment will not include wireless keyboards, mice, audio, user authentication, or video devices. OE.TRUSTED_ADMIN The operational environment will ensure that trusted PSD Administrators and users are appropriately trained. OE.TRUSTED_CONFIG The operational environment will ensure that administrators configuring the PSD and its operational environment follow the applicable security configuration guidance. OE.NO_SPECIAL_ANALOG _CAPABILITIES The operational environment will not have special analog data collection cards or peripherals such as analog to digital interface, high performance audio interface, or a component with digital signal processing or analog video capture functions. Table 10 – Security Objectives for the Operational Environment 4.3 SECURITY OBJECTIVES RATIONALE The security objectives rationale describes how the assumptions and threats map to the security objectives. Threat or Assumption Security Objective(s) Rationale T.DATA_LEAK O.COMPUTER _INTERFACE _ISOLATION Isolation of computer interfaces prevents data from leaking between them without authorization. O.COMPUTER _INTERFACE _ISOLATION _TOE_UNPOWERED Maintaining interface isolation while the TOE is in an unpowered state ensures that data cannot leak between computer interfaces. O.USER_DATA _ISOLATION The TOE’s routing of data only to the selected computer ensures that it will not leak to any others. O.NO_OTHER _EXTERNAL _INTERFACES The absence of additional external interfaces ensures that there is no unexpected method by which data can be leaked. O.UNIDIRECTIONAL _INPUT The TOE’s enforcement of unidirectional input for keyboard/mouse data prevents leakage of computer data through a connected peripheral interface. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 20 of 81 Threat or Assumption Security Objective(s) Rationale O.PERIPHERAL_PORTS _ISOLATION Isolation of peripheral ports prevents data from leaking between them without authorization. O.PROTECTED_EDID The TOE’s protection of the EDID interface prevents its use as a vector for unauthorized data leakage via this channel. O.UNIDIRECTIONAL _VIDEO The TOE’s enforcement of unidirectional output for video data protects against data leakage via connected computers by ensuring that no video data can be input to a connected computer through this interface. T.SIGNAL_LEAK O.COMPUTER _INTERFACE _ISOLATION Isolation of computer interfaces prevents data leakage through bit‐ wise signaling because there is no mechanism by which the signal data can be communicated. O.NO_OTHER _EXTERNAL _INTERFACES The absence of additional external interfaces ensures that there is no unexpected method by which data can be leaked through bitwise signaling. O.LEAK_PREVENTION _SWITCHING The TOE’s use of switching methods that are not susceptible to signal leakage helps mitigate the signal leak threat. O.UNIDIRECTIONAL _INPUT The TOE’s enforcement of unidirectional input for keyboard/mouse data prevents leakage of computer data through bit‐ by‐bit signaling to a connected peripheral interface. O.PROTECTED_EDID The TOE’s protection of the EDID interface prevents its use as a vector for bit‐by‐bit signal leakage via this channel. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 21 of 81 Threat or Assumption Security Objective(s) Rationale O.UNIDIRECTIONAL _VIDEO The TOE’s enforcement of unidirectional output for video data protects against signaling leakage via connected computers by ensuring that no video data can be input to a connected computer through this interface. T.RESIDUAL _LEAK O.NO_USER_DATA _RETENTION The TOE’s lack of data retention ensures that a residual data leak is not possible. O.PROTECTED_EDID The TOE’s protection of the EDID interface prevents the leakage of residual data by ensuring that no such data can be written to EDID memory. T.UNINTENDED _USE O.AUTHORIZED _USAGE The TOE’s support for only switching mechanisms that require explicit user action to engage ensures that a user has sufficient information to avoid interacting with an unintended computer. T.UNAUTHORIZED _DEVICES O.REJECT _UNAUTHORIZED _ENDPOINTS The TOE’s ability to reject unauthorized endpoints mitigates the threat of unauthorized devices being used to communicate with connected computers. O.REJECT _UNAUTHORIZED _PERIPHERAL The TOE’s ability to reject unauthorized peripherals mitigates the threat of unauthorized devices being used to communicate with connected computers. O.EMULATED_INPUT The TOE’s emulation of keyboard/mouse data input ensures that a connected computer will only receive this specific type of data through a connected peripheral. O.UNIDIRECTIONAL _VIDEO The TOE’s limitation of supported video protocol interfaces prevents the connection of unauthorized devices. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 22 of 81 Threat or Assumption Security Objective(s) Rationale T.LOGICAL _TAMPER O.NO_TOE_ACCESS The TOE’s prevention of logical access to its firmware, software, and memory mitigates the threat of logical tampering. O.EMULATED_INPUT The TOE’s emulation of keyboard/mouse data input prevents logical tampering of the TSF ensuring that only known inputs to it are supported. T.PHYSICAL _TAMPER O.ANTI_TAMPERING The TOE mitigates the threat of physical tampering through use of an enclosure that provides tamper detection functionality. O.TAMPER_EVIDENT _LABEL The TOE mitigates the threat of physical tampering through use of tamper evident labels that reveal physical tampering attempts. T.REPLACEMENT O.TAMPER_EVIDENT _LABEL The TOE’s use of a tamper evident label that provides authenticity of the device mitigates the threat that it is substituted for a replacement device during the acquisition process. T.FAILED O.SELF_TEST The TOE mitigates the threat of failures leading to compromise of security functions through self‐tests of its own functionality. O.SELF_TEST_FAIL _TOE_DISABLE The TOE mitigates the threat of failures leading to compromise of security functions by disabling all data flows in the event a failure is detected. O.SELF_TEST_FAIL _INDICATION The TOE mitigates the threat of failures leading to compromise of security functions by providing users with a clear indication when it is in a failure state and should not be trusted. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 23 of 81 Threat or Assumption Security Objective(s) Rationale A.NO_TEMPEST OE.NO_TEMPEST If the TOE’s operational environment does not include TEMPEST approved equipment, then the assumption is satisfied. A.NO_PHYSICAL OE.PHYSICAL If the TOE’s operational environment provides physical security, then the assumption is satisfied. A.NO_WIRELESS _DEVICES OE.NO_WIRELESS _DEVICES If the TOE’s operational environment does not include wireless peripherals, then the assumption is satisfied. A.TRUSTED_ADMIN OE.TRUSTED _ADMIN If the TOE’s operational environment ensures that only trusted administrators will manage the TSF, then the assumption is satisfied. A.TRUSTED _CONFIG OE.TRUSTED _CONFIG If TOE administrators follow the provided security configuration guidance, then the assumption is satisfied. A.USER_ALLOWED _ACCESS OE.PHYSICAL If the TOE’s operational environment provides physical access to connected computers, then the assumption is satisfied. A.NO_SPECIAL _ANALOG _CAPABILITIES OE.NO_SPECIAL _ANALOG _CAPABILITIES If administrators in the TOE’s operational environment take care to ensure that computers with special analog data collection interfaces are not connected to the TOE, then the assumption that such components are not present is satisfied. Table 11 – Security Objectives Rationale Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 24 of 81 5 EXTENDED COMPONENTS DEFINITION The extended components definition is presented in Appendix C of the Protection Profile for Peripheral Sharing Device [PP_PSD_V4.0] and in the modules for keyboard/mouse devices [MOD_KM_V1.0], and display devices [MOD_VI_1.0]. It is repeated here to ensure the completeness of this ST. The families to which these components belong are identified in the following table: Functional Class Functional Families User Data Protection (FDP) FDP_APC_EXT Active PSD Connections FDP_CDS_EXT Connected Displays Supported FDP_FIL_EXT Device Filtering FDP_IPC_EXT Internal Protocol Conversion FDP_PDC_EXT Peripheral Device Connection FDP_RDR_EXT Re-Enumeration Device Rejection FDP_RIP_EXT Residual Information Protection FDP_SPR_EXT Sub-Protocol Rules FDP_SWI_EXT PSD Switching FDP_UDF_EXT Unidirectional Data Flow Protection of the TSF (FPT) FPT_FLS_EXT Failure with Preservation of Secure State FPT_NTA_EXT No Access to TOE FPT_TST_EXT TSF Testing TOE Access (FTA) FTA_CIN_EXT Continuous Indications Table 12 – Functional Families of Extended Components 5.1 CLASS FDP: USER DATA PROTECTION FDP_APC_EXT Active PSD Connections Family Behavior Components in this family define the requirements for when an external interface to the TOE is authorized to transmit data related to peripheral sharing. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 25 of 81 Component Leveling FDP_APC_EXT.1 Active PSD Connections, restricts the flow of data through the TSF. Management: FDP_APC_EXT.1 No specific management functions are identified. Audit: FDP_APC_EXT.1 There are no auditable events foreseen. FDP_APC_EXT.1 Active PSD Connections Hierarchical to: No other components. Dependencies: No dependencies FDP_APS_EXT.1.1 The TSF shall route user data only to or from the interfaces selected by the user. FDP_APS_EXT.1.2 The TSF shall ensure that no data flows between connected computers whether the TOE is powered on or powered off. FDP_APS_EXT.1.3 The TSF shall ensure that no data transits the TOE when the TOE is powered off. FDP_APS_EXT.1.4 The TSF shall ensure that no data transits the TOE when the TOE is in a failure state. FDP_CDS_EXT Connected Displays Supported Family Behavior Components in this family define requirements for the number of display interfaces contained within the TOE. Component Leveling FDP_CDS_EXT.1, Connected Displays Supported, requires the TSF to define whether it supports one connected display at a time or multiple connected displays simultaneously. FDP_APC_EXT Active PSD Connections 1 FDP_CDS_EXT Connected Displays Supported 1 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 26 of 81 Management: FDP_CDS_EXT.1 There are no specific management functions identified. Audit: FDP_CDS_EXT.1 There are no auditable events foreseen. FDP_CDS_EXT.1 Connected Displays Supported Hierarchical to: No other components Dependencies: No other components FDP_CDS_EXT.1.1 The TSF shall support [selection: one connected display, multiple connected displays] at a time. FDP_FIL_EXT Device Filtering Family Behavior Components in this family define the requirements for device filtering. Component Leveling FDP_FIL_EXT.1 Device Filtering, requires the TSF to specify the method of device filtering used for peripheral interfaces and defines requirements for handling whitelists and blacklists. Management: FDP_FIL_EXT.1 The following actions could be considered for the management functions in FMT: • Ability to configure whitelist/blacklist members Audit: FDP_FIL_EXT.1 The following actions should be auditable if FAU_GEN.1 Audit Data Generation is included in the PP/ST: • Configuration of whitelist/blacklist members FDP_FIL_EXT.1 Device Filtering Hierarchical to: No other components Dependencies: FDP_PDC_EXT.1 Peripheral Device Connection FDP_FIL_EXT.1.1 The TSF shall have [selection: configurable, fixed] device filtering for [assignment: list of supported peripheral interface types] interfaces. FDP_FIL_EXT.1.2 The TSF shall consider all [assignment: blacklist name] blacklisted devices as unauthorized devices for [assignment: list of supported peripheral interface types] interfaces in peripheral device connections. FDP_FIL_EXT Device Filtering 1 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 27 of 81 FDP_FIL_EXT.1.3 The TSF shall consider all [assignment: whitelist name] whitelisted devices as authorized devices for peripheral device connections only if they are not on the [assignment: blacklist name] blacklist or otherwise unauthorized. FDP_IPC_EXT Internal Protocol Conversion Family Behavior Components in this family define requirements for the TOE’s ability to convert one protocol into another for internal processing. Component Leveling FDP_IPC_EXT.1, Internal Protocol Conversion, requires the TSF to specify an input protocol that the TOE receives, the protocol that the TSF converts it to, and whether the data is output from the TOE as the original protocol or as the converted one. Management: FDP_IPC_EXT.1 There are no specific management functions identified. Audit: FDP_IPC_EXT.1 There are no auditable events foreseen. FDP_IPC_EXT.1 Internal Protocol Conversion Hierarchical to: No other components Dependencies: FDP_PDC_EXT.2 Authorized Connection Protocols FDP_IPC_EXT.1.1 The TSF shall convert the [assignment: original protocol] protocol at the [assignment: TOE external interface(s)] into the [assignment: converted protocol] protocol within the TOE. FDP_IPC_EXT.1.2 The TSF shall output the [assignment: converted protocol] protocol from inside the TOE to [assignment: TOE external interface(s)] as [selection: [assignment: original protocol] protocol], [assignment: converted protocol] protocol]. FDP_PDC_EXT Peripheral Device Connection Family Behavior Components in this family define the requirements for peripheral device connections. This family is defined in the PSD PP. The PP‐Modules [MOD_KM_V1.0], [MOD_VI_V1.0] augment the extended family by adding two additional components, FDP_PDC_EXT.2 and FDP_PDC_EXT.3. The new components and FDP_IPC_EXT Internal Protocol Conversion 1 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 28 of 81 their impact on the extended family’s component leveling are shown below; reference the PSD PP for all other definitions for this family. Component Leveling FDP_PDC_EXT.1 Peripheral Device Connection, requires the TSF to limit external connections to only authorized devices. FDP_PDC_EXT.2 Authorized Devices, defines the types of physical devices that the TSF will permit to connect to it. FDP_PDC_EXT.3, Authorized Connection Protocols, defines the protocols that the TSF will authorize over its physical/logical interfaces, as well as any rules that are applicable to these interfaces. Management: FDP_PDC_EXT.1, FDP_PDC_EXT.2, FDP_PDC_EXT.3 No specific management functions are identified. Audit: FDP_PDC_EXT.1 The following actions should be auditable if FAU_GEN.1 Audit Data Generation is included in the PP/ST: • Acceptance or rejection of a peripheral Audit: FDP_PDC_EXT.2, FDP_PDC_EXT.3 There are no specific auditable events foreseen. FDP_PDC_EXT.1 Peripheral Device Connection Hierarchical to: No other components. Dependencies: No dependencies FDP_PDC_EXT.1.1 The TSF shall reject connections with unauthorized devices upon TOE power up and upon connection of a peripheral device to a powered‐on TOE. FDP_PDC_EXT.1.2 The TSF shall reject connections with devices presenting unauthorized interface protocols upon TOE power up and upon connection of a peripheral device to a powered‐on TOE. FDP_PDC_EXT Peripheral Device 1 2 3 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 29 of 81 FDP_PDC_EXT.1.3 The TOE shall have no external interfaces other than those claimed by the TSF. FDP_PDC_EXT.1.4 The TOE shall not have wireless interfaces. FDP_PDC_EXT.1.5 The TOE shall provide a visual or auditory indication to the User when a peripheral is rejected. FDP_PDC_EXT.2 Authorized Devices Hierarchical to: No other components. Dependencies: FDP_PDC_EXT.1 Peripheral Device Connection FDP_PDC_EXT.2.1 The TSF shall allow connections with authorized devices as defined in [assignment: devices specified in the PP or PP‐Module in which this SFR is defined] and [assignment: devices specified in another PP or PP‐Module that shares a PP Configuration with the PP or PP‐ Module in which this SFR is defined] upon TOE power up and upon connection of a peripheral device to a powered‐on TOE. FDP_PDC_EXT.2.2 The TSF shall allow connections with authorized devices presenting authorized interface protocols as defined in [assignment: devices specified in the PP or PP Module in which this SFR is defined] and [assignment: devices specified in another PP or PP‐Module that shares a PP‐Configuration with the PP or PP‐Module in which this SFR is defined] upon TOE power up and upon connection of a peripheral device to a powered‐on TOE. FDP_PDC_EXT.3 Authorized Connection Protocols Hierarchical to: No other components. Dependencies: FDP_PDC_EXT.1 Peripheral Device Connection FDP_PDC_EXT.3.1 The TSF shall have interfaces for the [assignment: list of supported protocols associated with physical and/or logical TSF interfaces] protocols. FDP_PDC_EXT.3.2 The TSF shall apply the following rules to the supported protocols: [assignment: rules defining the handling for communications over this protocol (e.g. any processing that must be done by the TSF prior to transmitting it through the TOE, circumstances or frequency with which the protocol is invoked)]. FDP_RDR_EXT Re-Enumeration Device Rejection Family Behavior Components in this family define requirements to reject device spoofing attempts through reenumeration. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 30 of 81 Component Leveling FDP_RDR_EXT.1 Re‐Enumeration Device Rejection, requires the TSF to reject re‐ enumeration as an unauthorized device. Management: FDP_RDR_EXT.1 No specific management functions are identified. Audit: FDP_RDR_EXT.1 There are no specific auditable events foreseen. FDP_RDR_EXT.1 Re-Enumeration Device Rejection Hierarchical to: No other components. Dependencies: FDP_PDC_EXT.1 Peripheral Device Connection FDP_RDR_EXT.1.1 The TSF shall reject any device that attempts to enumerate again as a different unauthorized device. FDP_RIP_EXT Residual Information Protection Family Behavior Components in this family define the requirements for how the TSF prevents data disclosure from its memory. Component Leveling FDP_RIP_EXT.1 Residual Information Protection, requires the TSF to prevent the writing of user data to non‐volatile memory. Management: FDP_RIP_EXT.1 The following actions could be considered for the management functions in FMT: • Ability to trigger the TSF’s purge function Audit: FDP_RIP_EXT.1 There are no auditable events foreseen. FDP_RDR_EXT Re- Enumeration Device Rejection 1 FDP_RIP_EXT Residual Information Protection 1 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 31 of 81 FDP_RIP_EXT.1 Residual Information Protection Hierarchical to: No other components. Dependencies: No dependencies FDP_RIP_EXT.1.1 The TSF shall ensure that no user data is written to TOE non‐volatile memory or storage. FDP_SPR_EXT Sub-Protocol Rules Family Behavior Components in this family define the sub‐protocols that the TSF allows or blocks depending on the protocols it supports. Component Leveling FDP_SPR_EXT.1 Sub‐Protocol Rules, requires the TSF to specify the allowed and blocked sub‐protocols based on the protocol it supports. Management: FDP_SPR_EXT.1 No specific management functions are identified. Audit: FDP_SPR_EXT.1 There are no auditable events foreseen. FDP_SPR_EXT.1 Sub-Protocol Rules Hierarchical to: No other components. Dependencies: FDP_PDC_EXT.3 Authorized Connection Protocols FDP_SPR_EXT.1.1 The TSF shall apply the following rules for the [assignment: supported protocol] protocol: • block the following video/display sub‐protocols: o [assignment: list of blocked sub‐protocols] • allow the following video/display sub‐protocols: o [assignment: list of allowed sub‐protocols]. FDP_SWI_EXT PSD Switching Family Behavior Components in this family define the requirements for how the TSF protects against inadvertent data switching. FDP_SPR_EXT Sub- Protocol Rules 1 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 32 of 81 Component Leveling FDP_SWI_EXT.1 PSD Switching, requires action on the part of a user in order for the TSF’s switching mechanisms to be activated. FDP_SWI_EXT.2 PSD Switching Methods, places restrictions on how the TSF’s switching mechanisms can be controlled. FDP_SWI_EXT.3 Tied Switching, requires the TSF to ensure that multiple connected peripherals are always switched to the same connected computer. Management: FDP_SWI_EXT.1, FDP_SWI_EXT.2, FDP_SWI_EXT.3 No specific management functions are identified. Audit: FDP_SWI_EXT.1, FDP_SWI_EXT.2, FDP_SWI_EXT.3 There are no auditable events foreseen. FDP_SWI_EXT.1 PSD Switching Hierarchical to: No other components. Dependencies: No dependencies FDP_SWI_EXT.1.1 The TSF shall ensure that [selection: the TOE supports only one connected computer, switching can be initiated only through express user action]. FDP_SWI_EXT.2 PSD Switching Methods Hierarchical to: No other components. Dependencies: FDP_SWI_EXT.1 PSD Switching FDP_SWI_EXT.2.1 The TSF shall ensure that no switching can be initiated through automatic port scanning, control through a connected computer, or control through keyboard shortcuts. FDP_APS_EXT.2.2 The TSF shall ensure that switching can be initiated only through express user action using [selection: console buttons, console switches, console touch screen, wired remote control, peripheral devices using a guard]. FDP_SWI_EXT PSD Switching 1 2 3 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 33 of 81 FDP_SWI_EXT.3 Tied Switching Hierarchical to: No other components. Dependencies: FDP_SWI_EXT.1 PSD Switching FDP_SWI_EXT.3.1 The TSF shall ensure that [assignment: two or more tied peripheral devices] are always switched together to the same connected computer. FDP_UDF_EXT Unidirectional Data Flow Family Behavior Components in this family define unidirectional transmission of user data. Component Leveling FDP_UDF_EXT.1 Unidirectional Data Flow, requires the TSF to provide unidirectional (one‐way) communications between a given pair of interface types. Management: FDP_UDF_EXT.1 No specific management functions are identified. Audit: FDP_UDF_EXT.1 There are no auditable events foreseen. FDP_UDF_EXT.1 Unidirectional Data Flow Hierarchical to: No other components. Dependencies: FDP_APC_EXT.1 Active PSD Connections FDP_UDF_EXT.1.1 The TSF shall ensure [assignment: type of data] data transits the TOE unidirectionally from the [assignment: origin point of data] interface to the [assignment: destination point of data] interface. 5.2 CLASS FPT: PROTECTION OF THE TSF FPT_FLS_EXT Failure with Preservation of Secure State Family Behavior Components in this family define the secure failure requirements for the TSF. FDP_UDF_EXT Unidirectional Data Flow 1 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 34 of 81 Component Leveling FPT_FLS_EXT.1 Failure with Preservation of Secure State, requires the TSF to go into a secure state upon the detection of selected failures. Management: FPT_FLS_EXT.1 No specific management functions are identified. Audit: FPT_FLS_EXT.1 There are no auditable events foreseen. FPT_FLS_EXT.1 Failure with Preservation of Secure State Hierarchical to: No other components. Dependencies: FPT_TST.1 TSF Testing FPT_PHP.3 Resistance to Physical Attack FPT_FLS_EXT.1.1 The TSF shall preserve a secure state when the following types of failures occur: failure of the power‐on self‐test and [selection: failure of the anti‐tamper function, no other failures]. FPT_NTA_EXT No Access to TOE Family Behavior Components in this family define what TSF information may be externally accessible. Component Leveling FPT_NTA_EXT.1 No Access to TOE, requires the TSF to block access to non‐ authorized TSF data via external ports. Management: FPT_NTA_EXT.1 No specific management functions are identified. Audit: FPT_NTA_EXT.1 There are no auditable events foreseen. FDP_FLS_EXT Failure with Preservation of Secure State 1 FPT_NTA_EXT No Access to TOE 1 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 35 of 81 FPT_NTA_EXT.1 No Access to TOE Hierarchical to: No other components. Dependencies: No dependencies FPT_NTA_EXT.1.1 TOE firmware, software, and memory shall not be accessible via the TOE’s external ports, with the following exceptions: [selection: the EDID memory of Video TOEs may be accessible from connected computers; the configuration data, settings, and logging data that may be accessible by authorized administrators; no other exceptions]. FPT_TST_EXT TSF Testing Family Behavior Components in this family define how the TSF responds to a self‐test failure. Component Leveling FPT_TST_EXT.1 TSF Testing, requires the TSF to shutdown normal functions and provide a visual or auditory indication that a self‐test has failed. Management: FPT_TST_EXT.1 No specific management functions are identified. Audit: FPT_TST_EXT.1 The following actions should be auditable if FAU_GEN.1 Audit Data Generation is included in the PP/ST: • Indication that the TSF self‐test was completed • Failure of self‐test FPT_TST_EXT.1 TSF Testing Hierarchical to: No other components. Dependencies: FPT_TST.1 TSF Testing FPT_TST_EXT.1.1 The TSF shall respond to a self‐test failure by providing users with a [selection: visual, auditory] indication of failure and by shutdown of normal TSF functions. 5.3 CLASS FTA: TOE ACCESS FTA_CIN_EXT Continuous Indications Family Behavior Components in this family define how the TSF displays its switching status. FPT_TST_EXT TSF Testing 1 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 36 of 81 Component Leveling FTA_CIN_EXT.1 Continuous Indications, requires the TSF to display a visual indication of what computers are selected. Management: FTA_CIN_EXT.1 No specific management functions are identified. Audit: FTA_CIN_EXT.1 There are no auditable events foreseen. FTA_CIN_EXT.1 Continuous Indications Hierarchical to: No other components. Dependencies: FDP_APC_EXT.1 Active PSD Connections FTA_CIN_EXT.1.1 The TSF shall display a visible indication of the selected computers at all times when the TOE is powered. FTA_CIN_EXT.1.2 The TSF shall implement the visible indication using the following mechanism: easily visible graphical and/or textual markings of each source video on the display, [selection: a button, a panel with lights, a screen with dimming function, a screen with no dimming function, [assignment: description of visible indication]]. FTA_CIN_EXT.1.3 The TSF shall ensure that while the TOE is powered the current switching status is reflected by [selection: the indicator, multiple indicators which never display conflicting information]. FTA_CIN_EXT Continuous Indications 1 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 37 of 81 6 SECURITY FUNCTIONAL REQUIREMENTS Section 6 provides security functional and assurance requirements that must be satisfied by a compliant TOE. 6.1 CONVENTIONS AND APPLICABILITY Conventions The CC permits four types of operations to be performed on functional requirements: selection, assignment, refinement, and iteration. These operations are shown using the same conventions as those in the PSD PP. This is defined in the PP as: • Assignment: Indicated by surrounding brackets and italics, e.g., [assigned item]. • Selection: Indicated by surrounding brackets and italics, e.g., [selected item]. • Refinement: Refined components are identified by using bold for additional information, or strikeout for deleted text. • Iteration: Iteration operations for iterations within the Protection Profile and associated modules are identified with a slash (‘/’) and an identifier (e.g. “/KM”). • Where an SFR does not apply equally to all devices, an additional tag has been added to indicate the products to which the SFR applies. This tag provides the applicable model names in brackets (e.g. FDP_CDS_EXT.1 (1) Connected Displays Supported (F1DN102MOD-BA-4, F1DN104MOD- BA-4, F1DN108MOD-BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN102MOD-PP-4, F1DN102MOD-DD-4, F1DN104MOD-HH-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN104MOD-DD-4, F1DN104MOD-XX-4)). Additionally, a number is appended to the SFR identifier where multiple iterations of the SFR are required. Extended Security Functional Requirement (SFRs) are identified by the inclusion of “EXT” in the Security Functional Requirement SFR name. Section Applicability Table 13 shows the TOE models and the Section 6 Subsections that include the SFRs claimed for that device. TOE Model Sections Describing Security Functionality F1DN102MOD-BA-4 Section 6.2 and Section 6.3 F1DN104MOD-BA-4 Section 6.2 and Section 6.3 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 38 of 81 TOE Model Sections Describing Security Functionality F1DN202MOD-BA-4 Section 6.2 and Section 6.4 F1DN204MOD-BA-4 Section 6.2 and Section 6.4 F1DN108MOD-BA-4 Section 6.2 and Section 6.3 F1DN208MOD-BA-4 Section 6.2 and Section 6.4 F1DN102MOD-HH-4 Section 6.2 and Section 6.3 F1DN102MOD-PP-4 Section 6.2 and Section 6.5 F1DN102MOD-DD-4 Section 6.2 and Section 6.6 F1DN202MOD-HH-4 Section 6.2 and Section 6.4 F1DN202MOD-PP-4 Section 6.2 and Section 6.7 F1DN202MOD-DD-4 Section 6.2 and Section 6.8 F1DN104MOD-HH-4 Section 6.2 and Section 6.3 F1DN104MOD-PP-4 Section 6.2 and Section 6.5 F1DN108MOD-PP-4 Section 6.2 and Section 6.5 F1DN104MOD-DD-4 Section 6.2 and Section 6.6 F1DN204MOD-HH-4 Section 6.2 and Section 6.4 F1DN204MOD-PP-4 Section 6.2 and Section 6.7 F1DN208MOD-PP-4 Section 6.2 and Section 6.7 F1DN204MOD-DD-4 Section 6.2 and Section 6.8 F1DN104MOD-XX-4 Section 6.2 and Section 6.9 F1DN204MOD-XX-4 Section 6.2 and Section 6.10 Table 13 – Devices and Applicable Sections 6.2 SECURITY FUNCTIONAL REQUIREMENTS FOR ALL DEVICES Section 6.2 details the security functional requirements that apply to all TOE devices. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 39 of 81 Class Identifier Name Source User Data Protection (FDP) FDP_APC_EXT.1/KM Active PSD Connections [MOD_KM_V1.0] FDP_APC_EXT.1/VI Active PSD Connections [MOD_VI_V1.0] FDP_FIL_EXT.1/KM Device Filtering (Keyboard/Mouse) [MOD_KM_V1.0] FDP_PDC_EXT.1 Peripheral Device Connection [PP_PSD_V4.0] [MOD_VI_V1.0]2 [MOD_KM_V1.0]3 FDP_PDC_EXT.2/KM Authorized Devices (Keyboard/Mouse) [MOD_KM_V1.0] FDP_PDC_EXT.2/VI Authorized Devices (Video Output) [MOD_VI_V1.0] FDP_PDC_EXT.3/KM Authorized Connection Protocols (Keyboard/Mouse) [MOD_KM_V1.0] FDP_RDR_EXT.1 Re-Enumeration Device Rejection [MOD_KM_V1.0] FDP_RIP_EXT.1 Residual Information Protection [PP_PSD_V4.0] FDP_RIP.1/KM Residual Information Protection (Keyboard Data) [MOD_KM_V1.0] FDP_SWI_EXT.1 PSD Switching [PP_PSD_V4.0] FDP_SWI_EXT.2 PSD Switching Methods [PP_PSD_V4.0] [MOD_KM_V1.0] FDP_SWI_EXT.3 Tied Switching [MOD_KM_V1.0] FDP_UDF_EXT.1/KM Unidirectional Data Flow (Keyboard/Mouse) [MOD_KM_V1.0] 2 There is no modification to this SFR in the [MOD_VI_V1.0]. However, there are additions to the Peripheral Device Connections associated with this SFR and additional evaluation activities. 3 There is no modification to this SFR in the [MOD_KM_V1.0]. However, there are additions to the Peripheral Device Connections associated with this SFR and additional evaluation activities. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 40 of 81 Class Identifier Name Source FDP_UDF_EXT.1/VI Unidirectional Data Flow (Video Output) [MOD_VI_V1.0] Protection of the TSF (FPT) FPT_FLS_EXT.1 Failure with Preservation of Secure State [PP_PSD_V4.0] FPT_NTA_EXT.1 No Access to TOE [PP_PSD_V4.0] FPT_PHP.1 Passive Detection of Physical Attack [PP_PSD_V4.0] FPT_TST.1 TSF testing [PP_PSD_V4.0] FPT_TST_EXT.1 TSF Testing [PP_PSD_V4.0] TOE Access (FTA) FTA_CIN_EXT.1 Continuous Indications [PP_PSD_V4.0] [MOD_VI_V1.0]4 Table 14 – Summary of Security Functional Requirements User Data Protection (FDP) 6.2.1.1 FDP_APC_EXT.1/KM Active PSD Connections FDP_APC_EXT.1.1/KM The TSF shall route user data only to or from the interfaces selected by the user. FDP_APC_EXT.1.2/KM The TSF shall ensure that no data or electrical signals flow between connected computers whether the TOE is powered on or powered off. FDP_APC_EXT.1.3/KM The TSF shall ensure that no data transits the TOE when the TOE is powered off. FDP_APC_EXT.1.4/KM The TSF shall ensure that no data transits the TOE when the TOE is in a failure state. 6.2.1.2 FDP_APC_EXT.1/VI Active PSD Connections FDP_APC_EXT.1.1/VI The TSF shall route user data only to or from the interfaces selected by the user. FDP_APC_EXT.1.2/VI The TSF shall ensure that no data or electrical signals flow between connected computers whether the TOE is powered on or powered off. 4 The refinement from [MOD_VI_V1.0] has been included in FTA_CIN_EXT.1.2. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 41 of 81 FDP_APC_EXT.1.3/VI The TSF shall ensure that no data transits the TOE when the TOE is powered off. FDP_APC_EXT.1.4/VI The TSF shall ensure that no data transits the TOE when the TOE is in a failure state. 6.2.1.3 FDP_FIL_EXT.1/KM Device Filtering (Keyboard/Mouse) FDP_FIL_EXT.1.1/KM The TSF shall have [fixed] device filtering for [keyboard, mouse] interfaces. FDP_FIL_EXT.1.2/KM The TSF shall consider all [PSD KM] blacklisted devices as unauthorized devices for [keyboard, mouse] interfaces in peripheral device connections. FDP_FIL_EXT.1.3/KM The TSF shall consider all [PSD KM] whitelisted devices as authorized devices for [keyboard, mouse] interfaces in peripheral device connections only if they are not on the [PSD KM] blacklist or otherwise unauthorized. 6.2.1.4 FDP_PDC_EXT.1 Peripheral Device Connection FDP_PDC_EXT.1.1 The TSF shall reject connections with unauthorized devices upon TOE power up and upon connection of a peripheral device to a powered‐on TOE. FDP_ PDC_EXT.1.2 The TSF shall reject connections with devices presenting unauthorized interface protocols upon TOE power up and upon connection of a peripheral device to a powered‐on TOE. FDP_ PDC_EXT.1.3 The TOE shall have no external interfaces other than those claimed by the TSF. FDP_ PDC_EXT.1.4 The TOE shall not have wireless interfaces. FDP_ PDC_EXT.1.5 The TOE shall provide a visual or auditory indication to the User when a peripheral is rejected. 6.2.1.5 FDP_PDC_EXT.2/KM Authorized Devices (Keyboard/Mouse) FDP_PDC_EXT.2.1/KM The TSF shall allow connections with authorized devices and functions as defined in [Appendix E] and [ • authorized devices as defined in the PP‐Module for Video/Display Devices ] upon TOE power up and upon connection of a peripheral device to a powered-on TOE. FDP_ PDC_EXT.2.2/KM The TSF shall allow connections with authorized devices presenting authorized interface protocols as defined in [Appendix E] and [ • authorized devices presenting authorized interface protocols as defined in the PP‐Module for Video/Display Devices Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 42 of 81 ] upon TOE power up and upon connection of a peripheral device to a powered-on TOE. 6.2.1.6 FDP_PDC_EXT.2/VI Peripheral Device Connection (Video Output) FDP_PDC_EXT.2.1/VI The TSF shall allow connections with authorized devices as defined in [Appendix E] and [ • authorized devices and functions as defined in the PP‐Module for Keyboard/Mouse Devices, ] upon TOE power up and upon connection of a peripheral device to a powered-on TOE. FDP_ PDC_EXT.2.2/VI The TSF shall allow connections with authorized devices presenting authorized interface protocols as defined in [Appendix E] and [ • authorized devices presenting authorized interface protocols as defined in the PP‐Module for Keyboard/Mouse Devices, ] upon TOE power up and upon connection of a peripheral device to a powered-on TOE. 6.2.1.7 FDP_PDC_EXT.3/KM Authorized Connection Protocols (Keyboard/Mouse) FDP_PDC_EXT.3.1/KM The TSF shall have interfaces for the [USB (keyboard), USB (mouse)] protocols. FDP_PDC_EXT.3.2/KM The TSF shall apply the following rules to the supported protocols: [the TSF shall emulate any keyboard or mouse device functions from the TOE to the connected computer]. 6.2.1.8 FDP_RDR_EXT.1 Re-Enumeration Device Rejection FDP_RDR_EXT.1.1 The TSF shall reject any device that attempts to enumerate again as a different unauthorized device. 6.2.1.9 FDP_RIP_EXT.1 Residual Information Protection FDP_RIP_EXT.1.1 The TSF shall ensure that no user data is written to TOE non‐volatile memory or storage. 6.2.1.10 FDP_RIP.1/KM Residual Information Protection (Keyboard Data) FDP_RIP.1.1/KM The TSF shall ensure that any keyboard data in volatile memory is purged upon switching computers. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 43 of 81 6.2.1.11 FDP_SWI_EXT.1 PSD Switching FDP_SWI_EXT.1.1 The TSF shall ensure that [switching can be initiated only through express user action]. 6.2.1.12 FDP_SWI_EXT.2 PSD Switching Methods FDP_SWI_EXT.2.1 The TSF shall ensure that no switching can be initiated through automatic port scanning, control through a connected computer, or control through keyboard shortcuts. FDP_SWI_EXT.2.2 The TSF shall ensure that switching can be initiated only through express user action using [console buttons, wired remote control, peripheral devices using a guard]. 6.2.1.13 FDP_SWI_EXT.3 Tied Switching FDP_SWI_EXT.3.1 The TSF shall ensure that [connected keyboard and mouse peripheral devices] are always switched together to the same connected computer. 6.2.1.14 FDP_UDF_EXT.1/KM Unidirectional Data Flow (Keyboard/Mouse) FDP_UDF_EXT.1.1/KM The TSF shall ensure [keyboard, mouse] data transits the TOE unidirectionally from the [TOE [keyboard, mouse]] peripheral interface(s) to the [TOE [keyboard, mouse]] interface. 6.2.1.15 FDP_UDF_EXT.1/VI Unidirectional Data Flow (Video Output) FDP_UDF_EXT.1.1/VI The TSF shall ensure [video] data transits the TOE unidirectionally from the [TOE computer video] interface to the [TOE peripheral device display] interface. Protection of the TSF (FPT) 6.2.2.1 FPT_FLS_EXT.1 Failure with Preservation of Secure State FPT_FLS_EXT.1.1 The TSF shall preserve a secure state when the following types of failures occur: failure of the power‐on self‐test and [no other failures]. 6.2.2.2 FPT_NTA_EXT.1 No Access to TOE FPT_NTA_EXT.1.1 TOE firmware, software, and memory shall not be accessible via the TOE’s external ports, with the following exceptions: [the Extended Display Identification Data (EDID) memory of Video TOEs may be accessible from connected computers; the configuration data, Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 44 of 81 settings, and logging data that may be accessible by authorized administrators]. 6.2.2.3 FPT_PHP.1 Passive Detection of Physical Attack FPT_PHP.1.1 The TSF shall provide unambiguous detection of physical tampering that might compromise the TSF. FPT_PHP.1.2 The TSF shall provide the capability to determine whether physical tampering with the TSF's devices or TSF's elements has occurred. 6.2.2.4 FPT_TST.1 TSF Testing FPT_TST.1.1 The TSF shall run a suite of self-tests [during initial start-up and at the conditions [no other conditions]] to demonstrate the correct operation of [user control functions and [no other functions]]. FPT_TST.1.2 The TSF shall provide authorized users with the capability to verify the integrity of [TSF data]. FPT_TST.1.3 The TSF shall provide authorized users with the capability to verify the integrity of [TSF]. 6.2.2.5 FPT_TST_EXT.1 TSF Testing FPT_TST_EXT.1.1 The TSF shall respond to a self‐test failure by providing users with a [visual, auditory] indication of failure and by shutdown of normal TSF functions. TOE Access (FTA) 6.2.3.1 FTA_CIN_EXT.1 Continuous Indications FTA_CIN_EXT.1.1 The TSF shall display a visible indication of the selected computers at all times when the TOE is powered. FTA_CIN_EXT.1.2 The TSF shall implement the visible indication using the following mechanism: easily visible graphical and/or textual markings of each source video on the display, [[illuminated buttons]]. FTA_CIN_EXT.1.3 The TSF shall ensure that while the TOE is powered the current switching status is reflected by [multiple indicators which never display conflicting information]. 6.3 ADDITIONAL SECURITY REQUIREMENTS FOR F1DN102MOD-BA-4, F1DN104MOD-BA- 4, F1DN108MOD-BA-4, F1DN102MOD-HH-4, F1DN104MOD-HH-4 Section 6.3 details the security functional requirements that are satisfied by the F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN108MOD-BA-4, F1DN102MOD- Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 45 of 81 HH-4 and F1DN104MOD-HH-4 TOE devices. These devices support a single connected display and the HDMI video protocol. Class Identifier Name Source User Data Protection (FDP) FDP_CDS_EXT.1(1) Connected Displays Supported (F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN108MOD-BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN102MOD-PP-4, F1DN102MOD-DD-4, F1DN104MOD-HH-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN104MOD-DD-4, F1DN104MOD-XX-4) [MOD_VI_V1.0] FDP_PDC_EXT.3/VI(1) Authorized Connection Protocols (Video Output) (F1DN102MOD-BA-4, F1DN202MOD-BA-4, F1DN104MOD-BA-4, F1DN204MOD-BA-4, F1DN108MOD-BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN202MOD-HH-4, F1DN104MOD-HH-4, F1DN204MOD-HH-4) [MOD_VI_V1.0] FDP_SPR_EXT.1/HDMI Sub-Protocol Rules (HDMI Protocol) (F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN108MOD-BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN202MOD-HH-4, F1DN104MOD-HH-4, F1DN204MOD-HH-4, F1DN104MOD-XX-4, F1DN204MOD-XX-4) [MOD_VI_V1.0] Table 15 – Summary of Additional Security Functional Requirements for F1DN102MOD- BA-4, F1DN104MOD-BA-4, F1DN108MOD-BA-4, F1DN102MOD-HH-4 and F1DN104MOD- HH-4 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 46 of 81 User Data Protection (FDP) 6.3.1.1 FDP_CDS_EXT.1(1) Connected Displays Supported (F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN108MOD- BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN102MOD-PP-4, F1DN102MOD-DD-4, F1DN104MOD- HH-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN104MOD-DD-4, F1DN104MOD-XX-4) FDP_CDS_EXT.1.1(1) The TSF shall support [one connected display] at a time. 6.3.1.2 FDP_PDC_EXT.3/VI(1) Authorized Connection Protocols (Video Output) (F1DN102MOD-BA-4, F1DN202MOD-BA-4, F1DN104MOD-BA-4, F1DN204MOD- BA-4, F1DN108MOD-BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN202MOD-HH-4, F1DN104MOD- HH-4, F1DN204MOD-HH-4) FDP_PDC_EXT.3.1/VI(1) The TSF shall have interfaces for the [HDMI] protocols. FDP_PDC_EXT.3.2/VI(1) The TSF shall apply the following rules to the supported protocols: [the TSF shall read the connected display EDID information once during power‐on or reboot]. 6.3.1.3 FDP_SPR_EXT.1/HDMI Sub-Protocol Rules (HDMI Protocol) (F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN108MOD- BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN202MOD-HH-4, F1DN104MOD-HH-4, F1DN204MOD- HH-4, F1DN104MOD-XX-4, F1DN204MOD-XX-4) FDP_SPR_EXT.1.1/HDMI The TSF shall apply the following rules for the [HDMI] protocol: • block the following video/display sub‐protocols: o [ARC o CEC, o EDID from computer to display, o HDCP, o HEAC, o HEC, o MCCS] • allow the following video/display sub‐protocols: o [EDID from display to computer, o HPD from display to computer]. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 47 of 81 6.4 ADDITIONAL SECURITY REQUIREMENTS FOR F1DN202MOD-BA-4, F1DN204MOD-BA- 4, F1DN208MOD-BA-4, F1DN202MOD-HH-4, F1DN204MOD-HH-4 Section 6.4 details the security functional requirements that are satisfied by the F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN208MOD-BA-4, F1DN202MOD- HH-4 and F1DN204MOD-HH-4 TOE devices. These devices support multiple connected displays and the HDMI video protocol. Class Identifier Name Source User Data Protection (FDP) FDP_CDS_EXT.1(2) Connected Displays Supported (F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN208MOD-BA-4, F1DN202MOD-HH-4, F1DN202MOD-PP-4, F1DN202MOD-DD-4, F1DN204MOD-HH-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4, F1DN204MOD-DD-4, F1DN204MOD-XX-4) [MOD_VI_V1.0] FDP_PDC_EXT.3/VI(1) Authorized Connection Protocols (Video Output) (F1DN102MOD-BA-4, F1DN202MOD-BA-4, F1DN104MOD-BA-4, F1DN204MOD-BA-4, F1DN108MOD-BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN202MOD-HH-4, F1DN104MOD-HH-4, F1DN204MOD-HH-4) [MOD_VI_V1.0] Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 48 of 81 Class Identifier Name Source FDP_SPR_EXT.1/HDMI Sub-Protocol Rules (HDMI Protocol) (F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN108MOD-BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN202MOD-HH-4, F1DN104MOD-HH-4, F1DN204MOD-HH-4, F1DN104MOD-XX-4, F1DN204MOD-XX-4) [MOD_VI_V1.0] Table 16 – Summary of Additional Security Functional Requirements for F1DN202MOD- BA-4, F1DN204MOD-BA-4, F1DN208MOD-BA-4 and F1DN204MOD-HH-4 User Data Protection (FDP) 6.4.1.1 FDP_CDS_EXT.1(2) Connected Displays Supported (F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN208MOD- BA-4, F1DN202MOD-HH-4, F1DN202MOD-PP-4, F1DN202MOD-DD-4, F1DN204MOD-HH-4, F1DN204MOD- PP-4, F1DN208MOD-PP-4, F1DN204MOD-DD-4, F1DN204MOD-XX-4) FDP_CDS_EXT.1.1(2) The TSF shall support [multiple connected displays] at a time. 6.4.1.2 FDP_PDC_EXT.3/VI(1) Authorized Connection Protocols (Video Output) (F1DN102MOD-BA-4, F1DN202MOD-BA-4, F1DN104MOD-BA-4, F1DN204MOD- BA-4, F1DN108MOD-BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN202MOD-HH-4, F1DN104MOD- HH-4, F1DN204MOD-HH-4) FDP_PDC_EXT.3.1/VI(1) The TSF shall have interfaces for the [HDMI] protocols. FDP_PDC_EXT.3.2/VI(1) The TSF shall apply the following rules to the supported protocols: [the TSF shall read the connected display EDID information once during power‐on or reboot]. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 49 of 81 6.4.1.3 FDP_SPR_EXT.1/HDMI Sub-Protocol Rules (HDMI Protocol) (F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN108MOD- BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN202MOD-HH-4, F1DN104MOD-HH-4, F1DN204MOD- HH-4, F1DN104MOD-XX-4, F1DN204MOD-XX-4) FDP_SPR_EXT.1.1/HDMI The TSF shall apply the following rules for the [HDMI] protocol: • block the following video/display sub‐protocols: o [ARC o CEC, o EDID from computer to display, o HDCP, o HEAC, o HEC, o MCCS] • allow the following video/display sub‐protocols: o [EDID from display to computer, o HPD from display to computer]. 6.5 ADDITIONAL SECURITY REQUIREMENTS FOR F1DN102MOD-PP-4, F1DN104MOD-PP- 4, F1DN108MOD-PP-4 Section 6.5 details the security functional requirements that are satisfied by the F1DN102MOD-PP-4, F1DN104MOD-PP-4 and F1DN108MOD-PP-4 TOE devices. These devices support a single connected display and the DisplayPort video protocol. Class Identifier Name Source User Data Protection (FDP) FDP_CDS_EXT.1(1) Connected Displays Supported (F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN108MOD-BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN102MOD-PP-4, F1DN102MOD-DD-4, F1DN104MOD-HH-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN104MOD-DD-4, F1DN104MOD-XX-4) [MOD_VI_V1.0] Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 50 of 81 Class Identifier Name Source FDP_IPC_EXT.1(1) Internal Protocol Conversion (F1DN102MOD-PP-4, F1DN202MOD-PP-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4) [MOD_VI_V1.0] FDP_PDC_EXT.3/VI(2) Authorized Connection Protocols (Video Output) (F1DN102MOD-PP-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN202MOD-PP-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4) [MOD_VI_V1.0] FDP_SPR_EXT.1/DP Sub-Protocol Rules (DisplayPort Protocol) (F1DN102MOD-PP-4, F1DN202MOD-PP-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4, F1DN104MOD-XX-4, F1DN204MOD-XX-4) [MOD_VI_V1.0] Table 17 – Summary of Additional Security Functional Requirements for F1DN102MOD- PP-4, F1DN104MOD-PP-4 and F1DN108MOD-PP-4 User Data Protection (FDP) 6.5.1.1 FDP_CDS_EXT.1(1) Connected Displays Supported (F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN108MOD- BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN102MOD-PP-4, F1DN102MOD-DD-4, F1DN104MOD- HH-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN104MOD-DD-4, F1DN104MOD-XX-4) FDP_CDS_EXT.1.1(1) The TSF shall support [one connected display] at a time. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 51 of 81 6.5.1.2 FDP_IPC_EXT.1(1) Internal Protocol Conversion (F1DN102MOD-PP-4, F1DN202MOD-PP-4, F1DN104MOD- PP-4, F1DN108MOD-PP-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4) FDP_IPC_EXT.1.1(1) The TSF shall convert the [DisplayPort] protocol at the [DisplayPort computer video interface] into the [HDMI] protocol within the TOE. FDP_IPC_EXT.1.2(1) The TSF shall output the [HDMI] protocol from inside the TOE to [peripheral display interface(s)] as [[DisplayPort] protocol, [HDMI] protocol]. 6.5.1.3 FDP_PDC_EXT.3/VI(2) Authorized Connection Protocols (Video Output) (F1DN102MOD-PP-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN202MOD- PP-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4) FDP_PDC_EXT.3.1/VI(2) The TSF shall have interfaces for the [DisplayPort] protocols. FDP_PDC_EXT.3.2/VI(2) The TSF shall apply the following rules to the supported protocols: [the TSF shall read the connected display EDID information once during power‐on or reboot]. 6.5.1.4 FDP_SPR_EXT.1/DP Sub-Protocol Rules (DisplayPort Protocol) (F1DN102MOD-PP-4, F1DN202MOD-PP-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN204MOD- PP-4, F1DN208MOD-PP-4, F1DN104MOD-XX-4, F1DN204MOD-XX-4) FDP_SPR_EXT.1.1/DP The TSF shall apply the following rules for the [DisplayPort] protocol: • block the following video/display sub‐protocols: o [CEC, o EDID from computer to display, o HDCP, o MCCS] • allow the following video/display sub‐protocols: o [EDID from display to computer, o HPD from display to computer, o Link Training]. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 52 of 81 6.6 ADDITIONAL SECURITY REQUIREMENTS FOR F1DN102MOD-DD-4, F1DN104MOD-DD- 4 Section 6.6 details the security functional requirements that are satisfied by the F1DN102MOD-DD-4 and F1DN104MOD-DD-4 TOE devices. These devices support a single connected display and the DVI-D video protocol. Class Identifier Name Source User Data Protection (FDP) FDP_CDS_EXT.1(1) Connected Displays Supported (F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN108MOD-BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN102MOD-PP-4, F1DN102MOD-DD-4, F1DN104MOD-HH-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN104MOD-DD-4, F1DN104MOD-XX-4) [MOD_VI_V1.0] FDP_PDC_EXT.3/VI(3) Authorized Connection Protocols (Video Output) (F1DN102MOD-DD-4, F1DN104MOD-DD-4, F1DN202MOD-DD-4, F1DN204MOD-DD-4) [MOD_VI_V1.0] FDP_SPR_EXT.1/DVI-D Sub-Protocol Rules (DVI-D Protocol) (F1DN102MOD-DD-4, F1DN202MOD-DD-4, F1DN104MOD-DD-4, F1DN204MOD-DD-4, F1DN204MOD-XX-4) [MOD_VI_V1.0] Table 18 – Summary of Additional Security Functional Requirements for F1DN102MOD- DD-4 and F1DN104MOD-DD-4 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 53 of 81 User Data Protection (FDP) 6.6.1.1 FDP_CDS_EXT.1(1) Connected Displays Supported (F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN108MOD- BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN102MOD-PP-4, F1DN102MOD-DD-4, F1DN104MOD- HH-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN104MOD-DD-4, F1DN104MOD-XX-4) FDP_CDS_EXT.1.1(1) The TSF shall support [one connected display] at a time. 6.6.1.2 FDP_PDC_EXT.3/VI(3) Authorized Connection Protocols (Video Output) (F1DN102MOD-DD-4, F1DN104MOD-DD-4, F1DN202MOD-DD-4, F1DN204MOD- DD-4) FDP_PDC_EXT.3.1/VI(3) The TSF shall have interfaces for the [DVI-D] protocols. FDP_PDC_EXT.3.2/VI(3) The TSF shall apply the following rules to the supported protocols: [the TSF shall read the connected display EDID information once during power‐on or reboot]. 6.6.1.3 FDP_SPR_EXT.1/DVI-D Sub-Protocol Rules (DVI-D Protocol) (F1DN102MOD-DD-4, F1DN202MOD-DD-4, F1DN104MOD-DD-4, F1DN204MOD-DD-4, F1DN204MOD- XX-4) FDP_SPR_EXT.1.1/DVI-D The TSF shall apply the following rules for the [DVI-D] protocol: • block the following video/display sub‐protocols: o [ARC, o CEC, o EDID from computer to display, o HDCP, o HEAC, o HEC, o MCCS] • allow the following video/display sub‐protocols: o [EDID from display to computer, o HPD from display to computer]. 6.7 ADDITIONAL SECURITY REQUIREMENTS FOR F1DN202MOD-PP-4, F1DN204MOD-PP- 4, F1DN208MOD-PP-4 Section 6.7 details the security functional requirements that are satisfied by the F1DN202MOD-PP-4, F1DN204MOD-PP-4 and F1DN208MOD-PP-4 TOE devices. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 54 of 81 These devices support multiple connected displays and the DisplayPort video protocol. Class Identifier Name Source User Data Protection (FDP) FDP_CDS_EXT.1(2) Connected Displays Supported (F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN208MOD-BA-4, F1DN202MOD-HH-4, F1DN202MOD-PP-4, F1DN202MOD-DD-4, F1DN204MOD-HH-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4, F1DN204MOD-DD-4, F1DN204MOD-XX-4) [MOD_VI_V1.0] FDP_IPC_EXT.1(1) Internal Protocol Conversion (F1DN102MOD-PP-4, F1DN202MOD-PP-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4) [MOD_VI_V1.0] FDP_PDC_EXT.3/VI(2) Authorized Connection Protocols (Video Output) (F1DN102MOD-PP-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN202MOD-PP-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4) [MOD_VI_V1.0] FDP_SPR_EXT.1/DP Sub-Protocol Rules (DisplayPort Protocol) (F1DN102MOD-PP-4, F1DN202MOD-PP-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4, F1DN104MOD-XX-4, F1DN204MOD-XX-4) [MOD_VI_V1.0] Table 19 – Summary of Additional Security Functional Requirements for F1DN202MOD- PP-4, F1DN204MOD-PP-4 and F1DN208MOD-PP-4 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 55 of 81 User Data Protection (FDP) 6.7.1.1 FDP_CDS_EXT.1(2) Connected Displays Supported (F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN208MOD- BA-4, F1DN202MOD-HH-4, F1DN202MOD-PP-4, F1DN202MOD-DD-4, F1DN204MOD-HH-4, F1DN204MOD- PP-4, F1DN208MOD-PP-4, F1DN204MOD-DD-4, F1DN204MOD-XX-4) FDP_CDS_EXT.1.1(2) The TSF shall support [multiple connected displays] at a time. 6.7.1.2 FDP_IPC_EXT.1(1) Internal Protocol Conversion (F1DN102MOD-PP-4, F1DN202MOD-PP-4, F1DN104MOD- PP-4, F1DN108MOD-PP-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4) FDP_IPC_EXT.1.1(1) The TSF shall convert the [DisplayPort] protocol at the [DisplayPort computer video interface] into the [HDMI] protocol within the TOE. FDP_IPC_EXT.1.2(1) The TSF shall output the [HDMI] protocol from inside the TOE to [peripheral display interface(s)] as [[DisplayPort] protocol, [HDMI] protocol]. 6.7.1.3 FDP_PDC_EXT.3/VI(2) Authorized Connection Protocols (Video Output) (F1DN102MOD-PP-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN202MOD- PP-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4) FDP_PDC_EXT.3.1/VI(2) The TSF shall have interfaces for the [DisplayPort] protocols. FDP_PDC_EXT.3.2/VI(2) The TSF shall apply the following rules to the supported protocols: [the TSF shall read the connected display EDID information once during power‐on or reboot]. 6.7.1.4 FDP_SPR_EXT.1/DP Sub-Protocol Rules (DisplayPort Protocol) (F1DN102MOD-PP-4, F1DN202MOD-PP-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN204MOD- PP-4, F1DN208MOD-PP-4, F1DN104MOD-XX-4, F1DN204MOD-XX-4) FDP_SPR_EXT.1.1/DP The TSF shall apply the following rules for the [DisplayPort] protocol: • block the following video/display sub‐protocols: o [CEC, o EDID from computer to display, o HDCP, o MCCS] • allow the following video/display sub‐protocols: Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 56 of 81 o [EDID from display to computer, o HPD from display to computer, o Link Training]. 6.8 ADDITIONAL SECURITY REQUIREMENTS FOR F1DN202MOD-DD-4, F1DN204MOD-DD- 4 Section 6.8 details the security functional requirements that are satisfied by the F1DN202MOD-DD-4 and F1DN204MOD-DD-4 TOE devices. These devices support multiple connected displays and the DVI-D video protocol. Class Identifier Name Source User Data Protection (FDP) FDP_CDS_EXT.1(2) Connected Displays Supported (F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN208MOD-BA-4, F1DN202MOD-HH-4, F1DN202MOD-PP-4, F1DN202MOD-DD-4, F1DN204MOD-HH-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4, F1DN204MOD-DD-4, F1DN204MOD-XX-4) [MOD_VI_V1.0] FDP_PDC_EXT.3/VI(3) Authorized Connection Protocols (Video Output) (F1DN102MOD-DD-4, F1DN104MOD-DD-4, F1DN202MOD-DD-4, F1DN204MOD-DD-4) [MOD_VI_V1.0] FDP_SPR_EXT.1/DVI- D Sub-Protocol Rules (DVI-D Protocol) (F1DN102MOD-DD-4, F1DN202MOD-DD-4, F1DN104MOD-DD-4, F1DN204MOD-DD-4, F1DN204MOD-XX-4) [MOD_VI_V1.0] Table 20 – Summary of Additional Security Functional Requirements for F1DN202MOD- DD-4 and F1DN204MOD-DD-4 Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 57 of 81 User Data Protection (FDP) 6.8.1.1 FDP_CDS_EXT.1(2) Connected Displays Supported (F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN208MOD- BA-4, F1DN202MOD-HH-4, F1DN202MOD-PP-4, F1DN202MOD-DD-4, F1DN204MOD-HH-4, F1DN204MOD- PP-4, F1DN208MOD-PP-4, F1DN204MOD-DD-4, F1DN204MOD-XX-4) FDP_CDS_EXT.1.1(2) The TSF shall support [multiple connected displays] at a time. 6.8.1.2 FDP_PDC_EXT.3/VI(3) Authorized Connection Protocols (Video Output) (F1DN102MOD-DD-4, F1DN104MOD-DD-4, F1DN202MOD-DD-4, F1DN204MOD- DD-4) FDP_PDC_EXT.3.1/VI(3) The TSF shall have interfaces for the [DVI-D] protocols. FDP_PDC_EXT.3.2/VI(3) The TSF shall apply the following rules to the supported protocols: [the TSF shall read the connected display EDID information once during power‐on or reboot]. 6.8.1.3 FDP_SPR_EXT.1/DVI-D Sub-Protocol Rules (DVI-D Protocol) (F1DN102MOD-DD-4, F1DN202MOD-DD-4, F1DN104MOD-DD-4, F1DN204MOD-DD-4, F1DN204MOD- XX-4) FDP_SPR_EXT.1.1/DVI-D The TSF shall apply the following rules for the [DVI-D] protocol: • block the following video/display sub‐protocols: o [ARC, o CEC, o EDID from computer to display, o HDCP, o HEAC, o HEC, o MCCS] • allow the following video/display sub‐protocols: o [EDID from display to computer, o HPD from display to computer]. 6.9 ADDITIONAL SECURITY REQUIREMENTS FOR F1DN104MOD-XX-4 Section 6.9 details the security functional requirements that are satisfied by the F1DN104MOD-XX-4 TOE device. These devices support a single connected display and the VGA, HDMI, DisplayPort and USB Type C with DisplayPort as an alternate function video protocols. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 58 of 81 Class Identifier Name Source User Data Protection (FDP) FDP_CDS_EXT.1(1) Connected Displays Supported (F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN108MOD-BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN102MOD-PP-4, F1DN102MOD-DD-4, F1DN104MOD-HH-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN104MOD-DD-4, F1DN104MOD-XX-4) [MOD_VI_V1.0] FDP_IPC_EXT.1(2) Internal Protocol Conversion (F1DN104MOD-XX-4, F1DN204MOD-XX-4) [MOD_VI_V1.0] FDP_PDC_EXT.3/VI(4) Authorized Connection Protocols (Video Output) (F1DN104MOD-XX-4) [MOD_VI_V1.0] FDP_SPR_EXT.1/DP Sub-Protocol Rules (DisplayPort Protocol) (F1DN102MOD-PP-4, F1DN202MOD-PP-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4, F1DN104MOD-XX-4, F1DN204MOD-XX-4) [MOD_VI_V1.0] Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 59 of 81 Class Identifier Name Source FDP_SPR_EXT.1/HDMI Sub-Protocol Rules (HDMI Protocol) (F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN108MOD-BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN202MOD-HH-4, F1DN104MOD-HH-4, F1DN204MOD-HH-4, F1DN104MOD-XX-4, F1DN204MOD-XX-4) [MOD_VI_V1.0] FDP_SPR_EXT.1/USB Sub-Protocol Rules (USB-C Protocol) (F1DN104MOD-XX-4, F1DN204MOD-XX-4) [MOD_VI_V1.0] FDP_SPR_EXT.1/VGA Sub-Protocol Rules (VGA Protocol) (F1DN104MOD-XX-4) [MOD_VI_V1.0] Table 21 – Summary of Additional Security Functional Requirements for F1DN104MOD- XX-4 User Data Protection (FDP) 6.9.1.1 FDP_CDS_EXT.1(1) Connected Displays Supported (F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN108MOD- BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN102MOD-PP-4, F1DN102MOD-DD-4, F1DN104MOD- HH-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN104MOD-DD-4, F1DN104MOD-XX-4) FDP_CDS_EXT.1.1(1) The TSF shall support [one connected display] at a time. 6.9.1.2 FDP_IPC_EXT.1(2) Internal Protocol Conversion (F1DN104MOD-XX-4, F1DN204MOD-XX-4) FDP_IPC_EXT.1.1(2) The TSF shall convert the [DisplayPort] protocol at the [DisplayPort computer video interface] into the [HDMI] protocol within the TOE. FDP_IPC_EXT.1.2(2) The TSF shall output the [HDMI] protocol from inside the TOE to [peripheral display interface(s)] as [ [HDMI] protocol]. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 60 of 81 6.9.1.3 FDP_PDC_EXT.3/VI(4) Authorized Connection Protocols (Video Output) (F1DN104MOD-XX-4) FDP_PDC_EXT.3.1/VI(4) The TSF shall have interfaces for the [VGA, HDMI, DisplayPort, USB Type-C with DisplayPort as alternate function ] protocols. FDP_PDC_EXT.3.2/VI(4) The TSF shall apply the following rules to the supported protocols: [the TSF shall read the connected display EDID information once during power‐on or reboot]. 6.9.1.4 FDP_SPR_EXT.1/DP Sub-Protocol Rules (DisplayPort Protocol) (F1DN102MOD-PP-4, F1DN202MOD-PP-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN204MOD- PP-4, F1DN208MOD-PP-4, F1DN104MOD-XX-4, F1DN204MOD-XX-4) FDP_SPR_EXT.1.1/DP The TSF shall apply the following rules for the [DisplayPort] protocol: • block the following video/display sub‐protocols: o [CEC, o EDID from computer to display, o HDCP, o MCCS] • allow the following video/display sub‐protocols: o [EDID from display to computer, o HPD from display to computer, o Link Training]. 6.9.1.5 FDP_SPR_EXT.1/HDMI Sub-Protocol Rules (HDMI Protocol) (F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN108MOD- BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN202MOD-HH-4, F1DN104MOD-HH-4, F1DN204MOD- HH-4, F1DN104MOD-XX-4, F1DN204MOD-XX-4) FDP_SPR_EXT.1.1/HDMI The TSF shall apply the following rules for the [HDMI] protocol: • block the following video/display sub‐protocols: o [ARC o CEC, o EDID from computer to display, o HDCP, o HEAC, o HEC, o MCCS] • allow the following video/display sub‐protocols: o [EDID from display to computer, Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 61 of 81 o HPD from display to computer]. 6.9.1.6 FDP_SPR_EXT.1/USB Sub-Protocol Rules (USB-C Protocol) (F1DN104MOD-XX-4, F1DN204MOD-XX-4) FDP_SPR_EXT.1.1/USB-C The TSF shall apply the following rules for the [USB Type‐C with DisplayPort as alternate function] protocol: • block the following video/display sub‐protocols: o [CEC, o EDID from computer to display, o HDCP, o MCCS] • allow the following video/display sub‐protocols: o [EDID from display to computer, o HPD from display to computer, o Link Training]. 6.9.1.7 FDP_SPR_EXT.1/VGA Sub-Protocol Rules (VGA Protocol) (F1DN104MOD-XX-4) FDP_SPR_EXT.1.1/VGA The TSF shall apply the following rules for the [VGA] protocol: • block the following video/display sub‐protocols: o [EDID from computer to display, o MCCS] • allow the following video/display sub‐protocols: o [EDID from display to computer]. 6.10 ADDITIONAL SECURITY REQUIREMENTS FOR F1DN204MOD-XX-4 Section 6.10 details the security functional requirements that are satisfied by the F1DN204MOD-XX-4 TOE device. These devices support multiple connected displays and the DVI-D, HDMI, DisplayPort and USB Type C with DisplayPort as an alternate function video protocols. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 62 of 81 Class Identifier Name Source User Data Protection (FDP) FDP_CDS_EXT.1(2) Connected Displays Supported (F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN208MOD-BA-4, F1DN202MOD-HH-4, F1DN202MOD-PP-4, F1DN202MOD-DD-4, F1DN204MOD-HH-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4, F1DN204MOD-DD-4, F1DN204MOD-XX-4) [MOD_VI_V1.0] FDP_IPC_EXT.1(2) Internal Protocol Conversion (F1DN104MOD-XX-4, F1DN204MOD-XX-4) [MOD_VI_V1.0] FDP_PDC_EXT.3/VI(5) Authorized Connection Protocols (Video Output) (F1DN204MOD-XX-4) [MOD_VI_V1.0] FDP_SPR_EXT.1/DP Sub-Protocol Rules (DisplayPort Protocol) (F1DN102MOD-PP-4, F1DN202MOD-PP-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4, F1DN104MOD-XX-4, F1DN204MOD-XX-4) [MOD_VI_V1.0] FDP_SPR_EXT.1/HDMI Sub-Protocol Rules (HDMI Protocol) (F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN108MOD-BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN202MOD-HH-4, F1DN104MOD-HH-4, F1DN204MOD-HH-4, F1DN104MOD-XX-4, F1DN204MOD-XX-4) [MOD_VI_V1.0] Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 63 of 81 Class Identifier Name Source FDP_SPR_EXT.1/USB Sub-Protocol Rules (USB-C Protocol) (F1DN104MOD-XX-4, F1DN204MOD-XX-4) [MOD_VI_V1.0] FDP_SPR_EXT.1/DVI- D Sub-Protocol Rules (DVI-D Protocol) (F1DN102MOD-DD-4, F1DN202MOD-DD-4, F1DN104MOD-DD-4, F1DN204MOD-DD-4, F1DN204MOD-XX-4) [MOD_VI_V1.0] Table 22 – Summary of Additional Security Functional Requirements for F1DN204MOD- XX-4 User Data Protection (FDP) 6.10.1.1 FDP_CDS_EXT.1(2) Connected Displays Supported (F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN208MOD- BA-4, F1DN202MOD-HH-4, F1DN202MOD-PP-4, F1DN202MOD-DD-4, F1DN204MOD-HH-4, F1DN204MOD- PP-4, F1DN208MOD-PP-4, F1DN204MOD-DD-4, F1DN204MOD-XX-4) FDP_CDS_EXT.1.1(2) The TSF shall support [multiple connected displays] at a time. 6.10.1.2 FDP_IPC_EXT.1(2) Internal Protocol Conversion (F1DN104MOD-XX-4, F1DN204MOD-XX-4) FDP_IPC_EXT.1.1(2) The TSF shall convert the [DisplayPort] protocol at the [DisplayPort computer video interface] into the [HDMI] protocol within the TOE. FDP_IPC_EXT.1.2(2) The TSF shall output the [HDMI] protocol from inside the TOE to [peripheral display interface(s)] as [ [HDMI] protocol]. 6.10.1.3 FDP_PDC_EXT.3/VI(5) Authorized Connection Protocols (Video Output) (F1DN204MOD-XX-4) FDP_PDC_EXT.3.1/VI(5) The TSF shall have interfaces for the [DVI-D, HDMI, DisplayPort, USB Type-C with DisplayPort as alternate function ] protocols. FDP_PDC_EXT.3.2/VI(5) The TSF shall apply the following rules to the supported protocols: [the TSF shall read the connected display EDID information once during power‐on or reboot]. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 64 of 81 6.10.1.4 FDP_SPR_EXT.1/DP Sub-Protocol Rules (DisplayPort Protocol) (F1DN102MOD-PP-4, F1DN202MOD-PP-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN204MOD- PP-4, F1DN208MOD-PP-4, F1DN104MOD-XX-4, F1DN204MOD-XX-4) FDP_SPR_EXT.1.1/DP The TSF shall apply the following rules for the [DisplayPort] protocol: • block the following video/display sub‐protocols: o [CEC, o EDID from computer to display, o HDCP, o MCCS] • allow the following video/display sub‐protocols: o [EDID from display to computer, o HPD from display to computer, o Link Training]. 6.10.1.5 FDP_SPR_EXT.1/HDMI Sub-Protocol Rules (HDMI Protocol) (F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN108MOD- BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN202MOD-HH-4, F1DN104MOD-HH-4, F1DN204MOD- HH-4, F1DN104MOD-XX-4, F1DN204MOD-XX-4) FDP_SPR_EXT.1.1/HDMI The TSF shall apply the following rules for the [HDMI] protocol: • block the following video/display sub‐protocols: o [ARC o CEC, o EDID from computer to display, o HDCP, o HEAC, o HEC, o MCCS] • allow the following video/display sub‐protocols: o [EDID from display to computer, o HPD from display to computer]. 6.10.1.6 FDP_SPR_EXT.1/USB Sub-Protocol Rules (USB-C Protocol) (F1DN104MOD-XX-4, F1DN204MOD-XX-4) FDP_SPR_EXT.1.1/USB-C The TSF shall apply the following rules for the [USB Type‐C with DisplayPort as alternate function] protocol: • block the following video/display sub‐protocols: o [CEC, o EDID from computer to display, o HDCP, o MCCS] Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 65 of 81 • allow the following video/display sub‐protocols: o [EDID from display to computer, o HPD from display to computer, o Link Training]. 6.10.1.7 FDP_SPR_EXT.1/DVI-D Sub-Protocol Rules (DVI-D Protocol) (F1DN102MOD-DD-4, F1DN202MOD-DD-4, F1DN104MOD-DD-4, F1DN204MOD-DD-4, F1DN204MOD- XX-4) FDP_SPR_EXT.1.1/DVI-D The TSF shall apply the following rules for the [DVI-D] protocol: • block the following video/display sub‐protocols: o [ARC, o CEC, o EDID from computer to display, o HDCP, o HEAC, o HEC, o MCCS] • allow the following video/display sub‐protocols: o [EDID from display to computer, o HPD from display to computer]. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 66 of 81 7 SECURITY ASSURANCE REQUIREMENTS The assurance requirements are summarized in Table 23. Assurance Class Assurance Components Identifier Name Development (ADV) ADV_FSP.1 Basic Functional Specification Guidance Documents (AGD) AGD_OPE.1 Operational user guidance AGD_PRE.1 Preparative procedures Life-Cycle Support (ALC) ALC_CMC.1 Labeling of the TOE ALC_CMS.1 TOE CM5 Coverage Security Target Evaluation (ASE) ASE_CCL.1 Conformance claims ASE_ECD.1 Extended Components Definition ASE_INT.1 ST Introduction ASE_OBJ.2 Security Objectives ASE_REQ.2 Derived Security Requirements ASE_SPD.1 Security Problem Definition ASE_TSS.1 TOE Summary Specification Tests (ATE) ATE_IND.1 Independent Testing - Conformance Vulnerability Assessment (AVA) AVA_VAN.1 Vulnerability Survey Table 23 – Security Assurance Requirements 5 Configuration Management Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 67 of 81 8 SECURITY REQUIREMENTS RATIONALE 8.1 SECURITY FUNCTIONAL REQUIREMENTS RATIONALE Table 9 provides a mapping between the SFRs and Security Objectives. 8.2 DEPENDENCY RATIONALE Table 24 identifies the Security Functional Requirements and their associated dependencies. It also indicates whether the ST explicitly addresses each dependency. SFR Dependencies Rationale Statement FDP_APC_EXT.1/KM None N/A FDP_APC_EXT.1/VI None N/A FDP_CDS_EXT.1(1) None N/A FDP_CDS_EXT.1(2) None N/A FDP_FIL_EXT.1/KM FDP_PDC_EXT.1 Included FDP_IPC_EXT.1(1) FDP_PDC_EXT.2 Included FDP_IPC_EXT.1(2) FDP_PDC_EXT.2 Included FDP_PDC_EXT.1 None N/A FDP_PDC_EXT.2/KM FDP_PDC_EXT.1 Included FDP_PDC_EXT.2/VI FDP_PDC_EXT.2 Included FDP_PDC_EXT.3/KM FDP_PDC_EXT.1 Included FDP_PDC_EXT.3/VI(1) FDP_PDC_EXT.2 Included FDP_PDC_EXT.3/VI(2) FDP_PDC_EXT.2 Included FDP_PDC_EXT.3/VI(3) FDP_PDC_EXT.2 Included FDP_PDC_EXT.3/VI(4) FDP_PDC_EXT.2 Included FDP_PDC_EXT.3/VI(5) FDP_PDC_EXT.2 Included FDP_RDR_EXT.1 FDP_PDC_EXT.1 Included FDP_RIP_EXT.1 None N/A FDP_RIP.1/KM None N/A FDP_SPR_EXT.1/DP FDP_PDC_EXT.3 Included Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 68 of 81 SFR Dependencies Rationale Statement FDP_SPR_EXT.1/DVI-D FDP_PDC_EXT.3 Included FDP_SPR_EXT.1/HDMI FDP_PDC_EXT.3 Included FDP_SPR_EXT.1/USB-C FDP_PDC_EXT.3 Included FDP_SPR_EXT.1/VGA FDP_PDC_EXT.3 Included FDP_SWI_EXT.1 None N/A FDP_SWI_EXT.2 FDP_SWI_EXT.1 Included FDP_SWI_EXT.3 FDP_SWI_EXT.1 Included FDP_UDF_EXT.1/KM FDP_APC_EXT.1 Included FDP_UDF_EXT.1/VI FDP_APC_EXT.1 Included FPT_FLS_EXT.1 FPT_TST.1 FPT_PHP.3 Included Included only if anti‐tamper is selected in FPT_FLS_EXT.1.1 FPT_NTA_EXT.1 None N/A FPT_PHP.1 None N/A FPT_TST.1 None N/A FPT_TST_EXT.1 FPT_TST.1 Included FTA_CIN_EXT.1 FDP_APC_EXT.1 Included Table 24 – Functional Requirement Dependencies 8.3 SECURITY ASSURANCE REQUIREMENTS RATIONALE The TOE assurance requirements for this ST consist of the requirements indicated in the [PP_PSD_V4.0]. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 69 of 81 9 TOE SUMMARY SPECIFICATION This section provides a description of the security functions and assurance measures of the TOE that meet the TOE security requirements. Unless otherwise stated, the description applies to all devices. 9.1 USER DATA PROTECTION System Controller Each device includes a System Controller which is responsible for device management, user interaction, system control security functions, and device monitoring. It receives user input from the switches on the front panel or from the wired remote control, and drives the TOE channel select lines that control switching circuits within the TOE. The System Controller includes a microcontroller with internal non-volatile, Read Only Memory (ROM). The controller function manages the TOE functionality through a pre-programmed state machine loaded on the ROM as read-only firmware during product manufacturing. Following boot up of the TOE, the channel select lines are set to Channel 1 by default. The channel select lines are also used to link the System Controller channel select commands to the Field Programmable Gate Array (FPGA) that supports video processing. The user determines which host computer is to be connected to the peripherals by pressing a button on the TOE front panel, or by selecting a channel on the remote control. The remote control for the Modular Secure KVM Series units (see Table 2) has push buttons on the left side of the keyboard. When the remote control device is used, both the front panel button and the remote’s channel indicator for the selected computer are illuminated. These are always consistent. Switching can only be initiated through express user action. KVM devices may be switched with peripheral devices using a guard6 . This is done by moving the mouse to the edge of the screen while pressing the left CTRL key. TOE Security Functional Requirements addressed: FDP_SWI_EXT.1, FDP_SWI_EXT.2. 6 See Section 10.1 or [PP_PSD_V4.0] for the definition of a guard. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 70 of 81 9.1.1.1 Active PSD Connections The TOE ensures that data flows only between the peripherals and the connected computer selected by the user. No data transits the TOE when the TOE is powered off, or when the TOE is in a failure state. A failure state occurs when the TOE fails a self-test when powering on, or when the anti-tampering function has been triggered. TOE Security Functional Requirements addressed: FDP_APC_EXT.1/KM, FDP_APC_EXT.1/VI. 9.1.1.2 Connected Computer Interfaces The connected computers are attached to the TOE as follows: • The TOE connects to the keyboard and mouse port using a USB A to USB B cable. The USB A end attaches to the computer, and the USB B end attaches to the TOE. • The TOE is connected to the computer video port using a video cable supporting DisplayPort, HDMI, or DVI-D, VGA or a USB-Type C Display Port interface. For DVI-D, VGA or USB-Type C connections, the cables convert the protocol to HDMI for switching. The cables are considered to be part of the TOE device. TOE Security Functional Requirements addressed: FDP_PDC_EXT.1. 9.1.1.3 Residual Information Protection The Letter of Volatility is included as Annex A. TOE Security Functional Requirements addressed: FDP_RIP_EXT.1. Keyboard and Mouse Functionality 9.1.2.1 Keyboard and Mouse Enumeration The TOE determines whether or not a peripheral device that has been plugged into the keyboard and mouse peripheral ports is allowed to operate with the TOE. The TOE uses optical data diodes to enforce a unidirectional data flow from the user peripherals to the coupled hosts, and uses isolated device emulators to prevent data leakage through the peripheral switching circuitry. The Static Random Access Memory (SRAM) in the host and device emulator circuitry stores USB Host stack parameters and up to the last 4 key codes. User data may be briefly retained; however, there are no data buffers. Data is erased during power off of the KVM, and when the user switches channels. When the TOE switches from one computer to another, the system controller ensures that the keyboard and mouse stacks are deleted, and that any data received from the keyboard in the first 100 milliseconds following switching is deleted. This is done to ensure that any data buffered in the keyboard microcontroller is not passed to the newly selected computer. The TOE supports USB Type A HIDs on keyboard and mouse ports. The USB bidirectional communication protocol is converted into a unidirectional Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 71 of 81 proprietary protocol, and is then converted back into the USB bidirectional protocol to communicate with the coupled computer hosts. A USB keyboard is connected to the TOE keyboard host emulator through the console keyboard port. The keyboard host emulator is a microcontroller which enumerates the connected keyboard and verifies that it is a permitted device type. Once the keyboard has been verified, the USB keyboard sends scan codes, which are generated when the user types. These scan codes are converted by the keyboard host emulator into a proprietary protocol data stream that is combined with the data stream from the mouse host emulator. Similarly, the USB mouse is connected to the TOE mouse host emulator through the USB mouse port. The mouse host emulator is a microcontroller which enumerates the connected mouse and verifies that it is a permitted device type. Once the mouse device has been verified, it sends serial data generated by mouse movement and button use. The mouse serial data is converted by the mouse host emulator into a proprietary protocol data stream that is combined with the data stream from the keyboard host emulator. TOE Security Functional Requirements addressed: FDP_PDC_EXT.3/KM, FDP_UDF_EXT.1/KM, FDP_RIP.1/KM. 9.1.2.2 Keyboard and Mouse Switching Functionality The combined data stream is passed through the channel select lines to the selected host channel. The channel select lines are driven by the System Controller Module, and the selection is based on user input through use of the mouse or keyboard. Once a channel is selected, the combined mouse and keyboard data stream is passed through an optical data diode and routed to the specific host channel device emulator. The optical data diode is an opto-coupler designed to physically prevent reverse data flow. The keyboard and mouse can only be switched together. Device emulators are USB enabled microcontrollers that are programmed to emulate a standard USB keyboard and mouse composite device. The combined data stream is converted back to bidirectional data before reaching the selected host computer. Since the keyboard and mouse function are emulated by the TOE, the connected computer is not able to send data to the keyboard that would allow it to indicate that Caps Lock, Num Lock or Scroll Lock are set. These are indicated on the TOE front panel. TOE Security Functional Requirements addressed: FDP_APC_EXT.1/KM, FDP_UDF_EXT.1/KM, FDP_SWI_EXT.3. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 72 of 81 9.1.2.3 Keyboard and Mouse Compatible Device Types The TOE employs fixed device filtering and accepts only USB HID devices at the keyboard and mouse peripheral ports. Only USB Type A connections are permitted. The TOE does not support a wireless connection to a mouse, keyboard or USB hub. TOE Security Functional Requirements addressed: FDP_PDC_EXT.1, FDP_PDC_EXT.2/KM, FDP_FIL_EXT.1/KM. 9.1.2.4 Re-Enumeration Device Rejection If a connected device attempts to re-enumerate as a different USB device type, it will be rejected by the TOE. TOE Security Functional Requirements addressed: FDP_RDR_EXT.1. Video Switching Functionality Video data flow is comprised of unidirectional Extended Display Identification Data (EDID) and video data flow paths. Figure 3 shows a data flow during the display EDID read function. Figure 3 – Display EDID Read Function An EDID read event only occurs as the TOE is being powered up. The video controller reads the EDID content from the display device to verify that it is valid and usable. If data is not valid, TOE operation will cease and wait for the display peripheral to be changed. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 73 of 81 Figure 3 shows a data flow during the display EDID read function. Figure 4 – Display EDID Write Function Figure 4 illustrates the video controller (shown in blue) as it writes the EDID content into the first channel emulated EDID Electrically Erasable Programmable Read-Only Memory (EEPROM) chip (shown in gray). The thick lines in this figure indicate native video lines, and the thin lines indicate Inter-Integrated Circuit (I2C) lines. The EDID multiplexer couples the I2C lines to the first EDID mode switch (shown in orange). The first EDID mode switch switches the video controller I2C lines to the first emulated EDID EEPROM chip (shown in gray). The chip write protect switch opens to enable writing. The video controller uses the I2C lines to write to the first emulated EDID EEPROM chip. Once the write operation is complete and verified, the video controller switches the EDID multiplexer to the next channel and the operation repeats until all chips are programmed. Once the write operation is complete, the video controller switches to normal operating mode, as shown in Figure 5 below. In EDID write mode, the Emulated EDID EEPROM chips are switched to their respective computers to enable reading of the EDID information. The write protect switches are switched back to protected mode to prevent any attempt to write to the EEPROM or to transmit MCCS commands. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 74 of 81 Figure 5 – Display Normal Mode In normal mode, each computer interface operates independently. The power to each emulated EDID EEPROM is received from its respective computer through the video cable. The main video multiplexer is switched to the user selected computer to enable the proper video display. During TOE normal operation (Figure 5), any attempt by a connected computer to affect the EDID channel is blocked by the architecture. Each computer is only able to affect its own emulated EDID EEPROM. Video input interfaces are isolated from one another. Isolation is achieved through the use of separate power and ground planes, separate electronic components and a separate emulated EDID chip for each channel. The EDID function is emulated by an independent emulation EEPROM chip for each computer channel. These chips read content from the connected display once during TOE power up. Any subsequent change to the display peripheral will be ignored. The TOE will reject any display device that does not present valid EDID content. An LED on the rear panel of the TOE will indicate a rejected display device. The TOE supports DisplayPort versions 1.1, 1.2 and 1.3, HDMI 2.0, DVI-D, USB- C and VGA connections: Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 75 of 81 • For DisplayPort connections, the TOE video function filters the AUX channel by converting it to I2C EDID only. DisplayPort video is converted into an HDMI video stream, and the I2C EDID lines connected to the emulated EDID EEPROM functions as shown in the figures above. This allows EDID to be passed from the display to the computer (as described above), and allows Hot-Plug Detection (HPD) and Link Training information to pass through the TOE. AUX channel threats are mitigated through the conversion from DisplayPort to HDMI protocols. Traffic types including USB, Ethernet, MCCS, and EDID write from the computer to the display are blocked by the TOE. High-bandwidth Digital Content Protection (HDCP) and Consumer Electronics Control (CEC) functions are not connected. o DisplayPort input is supported on the F1DN102MOD-PP-4, F1DN202MOD-PP-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4, F1DN104MOD-XX-4 and F1DN204MOD-XX-4 devices. o DisplayPort peripherals are supported by the F1DN102MOD-PP-4, F1DN202MOD-PP-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN204MOD-PP-4 and F1DN208MOD-PP-4 devices. • For DVI-D connections, EDID information is allowed to pass from the display to the computer, as described above. HPD information is also allowed to pass. Other protocols, including Audio Return Channel (ARC), EDID from the computer to the display, HDMI Ethernet and Audio Return Channel (HEAC), HDMI Ethernet Channel (HEC) and MCCS are blocked. HDCP and Consumer Electronics Control (CEC) functions are not connected. o The DVI-D protocol is supported on the F1DN102MOD-DD-4, F1DN202MOD-DD-4, F1DN104MOD-DD-4, F1DN204MOD-DD-4 and F1DN204MOD-XX-4 devices for both input and peripheral devices. • For HDMI connections, EDID information is allowed to pass from the display to the computer, as described above. HPD information is also allowed to pass. Other protocols, including Audio Return Channel (ARC), EDID from the computer to the display, HDMI Ethernet and Audio Return Channel (HEAC), and HDMI Ethernet Channel (HEC) are blocked. HDCP and Consumer Electronics Control (CEC) functions are not connected. o The HDMI protocol is supported on the F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN108MOD-BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN202MOD-HH-4, F1DN104MOD-HH-4, F1DN204MOD-HH-4, F1DN104MOD-XX-4 and F1DN204MOD-XX-4 devices for both input and peripheral devices. • For USB-C connections, EDID information is allowed to pass from the display to the computer, as described above. HPD information and Link Training are also allowed to pass. Other protocols, including EDID from Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 76 of 81 the computer to the display, and MCCS are blocked. HDCP and Consumer Electronics Control (CEC) functions are not connected. o USB Type C with DisplayPort as an alternate function is supported for video input on the F1DN104MOD-XX-4 and F1DN204MOD-XX-4 devices. • For VGA connections, EDID information is allowed to pass from the display to the computer, as described above. Other protocols, including EDID from the computer to the display, and MCCS are blocked. o VGA input is supported for video input on the F1DN104MOD-XX-4 device. The TOE video function blocks MCCS write transactions through the emulated EDID EEPROMs. The emulated EEPROMs support only EDID read transactions, and are isolated by the write protect switch. Following a failed self-test, or when the TOE is powered off, all video input signals are isolated from other video inputs and from the video output interfaces by the active video re-drivers. Emulated EDID EEPROMs may still operate since they are powered by their respective computers; however, the video function remains isolated. TOE Security Functional Requirements addressed: FDP_IPC_EXT.1(1), FDP_IPC_EXT.1(2), FDP_SPR_EXT.1/DP, FDP_SPR_EXT.1/DVI-D, FDP_SPR_EXT.1/HDMI, FDP_SPR_EXT.1/USB-C, FDP_SPR_EXT.1/VGA. 9.1.3.1 Video Compatible Device Types The TOE accepts any DisplayPort of HDMI display device at the video peripheral ports. The TOE does not support a wireless connection to a video display. The F1DN102MOD-BA-4, F1DN104MOD-BA-4, F1DN108MOD-BA-4, F1DN208MOD-BA-4, F1DN102MOD-HH-4, F1DN102MOD-PP-4, F1DN102MOD- DD-4, F1DN104MOD-HH-4, F1DN104MOD-PP-4, F1DN108MOD-PP-4, F1DN104MOD-DD-4 and F1DN104MOD-XX-4 devices support a single display. The F1DN202MOD-BA-4, F1DN204MOD-BA-4, F1DN208MOD-BA-4, F1DN202MOD-HH-4, F1DN202MOD-PP-4, F1DN202MOD-DD-4, F1DN204MOD- HH-4, F1DN204MOD-PP-4, F1DN208MOD-PP-4, F1DN204MOD-DD-4 and F1DN204MOD-XX-4 devices support two displays. TOE Security Functional Requirements addressed: FDP_PDC_EXT.1, FDP_PDC_EXT.2/VI, FDP_PDC_EXT.3/VI, FDP_CDS_EXT.1(1), FDP_CDS_EXT.1(2). 9.2 PROTECTION OF THE TSF No Access to TOE Connected computers do not have access to TOE firmware or memory, with the exception of EDID data, which is accessible to connected computers from the TOE. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 77 of 81 All of the TOE microcontrollers run from internal protected flash memory. Firmware cannot be updated from an external source. Firmware cannot be read or rewritten through the use of Joint Test Action Group (JTAG) tools. Firmware is executed on Static Random Access Memory (SRAM) with the appropriate protections to prevent external access and tampering of code or stacks. TOE Security Functional Requirements addressed: FPT_NTA_EXT.1. Anti-tampering Functionality The TOE enclosure was designed specifically to prevent physical tampering. It features a stainless-steel welded chassis and panels that prevent external access through bending or brute force. Additionally, each device is fitted with one or more holographic Tampering Evident Labels placed at critical locations on the TOE enclosure. If the label is removed, the word ‘VOID’ appears on both the label and the product surface. TOE Security Functional Requirements addressed: FPT_PHP.1. TSF Testing The TOE performs a self-test at initial start-up. The self-test runs independently at each microcontroller and performs the following checks: • Verification of the front panel push-buttons • Verification of the integrity of the microcontroller firmware • Verification of computer port isolation. This is tested by sending test packets to various interfaces and attempting to detect this traffic at all other interfaces If the self-test fails, the Light Emitting Diodes (LEDs) on the front panel blink and the device makes a clicking sound to indicate the failure. The TOE disables the PSD switching functionality, and remains in a disabled state until the self- test is rerun and passes. All self-test failures are recorded in the log file, together with the date and time. TOE Security Functional Requirements addressed: FPT_FLS_EXT.1, FPT_TST.1, FPT_TST_EXT.1. 9.3 TOE ACCESS Continuous Indications The TOE user switches between computers by pressing the corresponding front panel button on the device. The front panel button corresponding to the selected computer will illuminate. On power up, all peripherals are connected to channel #1, and the corresponding push button LED will be illuminated. TOE Security Functional Requirements addressed: FTA_CIN_EXT.1. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 78 of 81 Wired Remote Control The remote control device for the Modular Secure KVM Series devices is built into a custom keyboard, and acts as a wired remote control as described in the [PP_PSD_V4.0]. When the user selects a channel using the remote control keyboard, the selected channel indicator on the left side of the remote control devices illuminates, and a signal is sent from the wired remote control device to the KVM switch. The corresponding channel on the switch also illuminates and the TOE peripheral sharing device switches to the indicated channel. Additionally, a holographic Tampering Evident Label is placed at a critical location on the remote control device. If the label is removed, the word ‘VOID’ appears on both the label and the product surface. TOE Security Functional Requirements addressed: FTA_CIN_EXT.1, FPT_PHP.1. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 79 of 81 10TERMINOLOGY AND ACRONYMS 10.1 TERMINOLOGY The following terminology is used in this ST: Term Description AUX AUX refers to the auxiliary channel, particularly as it applies to the DisplayPort protocol. Guard 'Guard' refers to a peripheral sharing device function that requires multiple express user actions in order to switch between connected computers using connected peripherals. KM KM refers to the requirements for Keyboard/Mouse Devices. VI VI refers to the requirements for Video/Display Devices. Table 25 – Terminology 10.2 ACRONYMS The following acronyms are used in this ST: Acronym Definition ARC Audio Return Channel CC Common Criteria CEC Consumer Electronics Control CM Configuration Management DE Device Emulator DVI Digital Visual Interface EDID Extended Display Identification Data EEPROM Electrically Erasable Programmable Read-Only Memory FPGA Field Programmable Gate Array HDCP High-bandwidth Digital Content Protection HDMI High-Definition Multimedia Interface HE Host Emulator HEAC HDMI Ethernet and Audio Return Channel HEC HDMI Ethernet Channel Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 80 of 81 Acronym Definition HID Human Interface Device HPD Hot-Plug Detection I2C Inter-Integrated Circuit IT Information Technology JTAG Joint Test Action Group KVM Keyboard, Video, Mouse LED Light Emitting Diode MCCS Monitor Control Command Set NIAP National Information Assurance Partnership OTP One Time Programming PP Protection Profile PSD Peripheral Sharing Device ROM Read Only Memory SFR Security Functional Requirement SRAM Static Random Access Memory ST Security Target TOE Target of Evaluation TSF TOE Security Functionality USB Universal Serial Bus VGA Video Graphics Array Table 26 – Acronyms Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page 81 of 81 11REFERENCES Identifier Title [CC] Common Criteria for Information Technology Security Evaluation – • Part 1: Introduction and General Model, CCMB‐2017‐ 04‐001, Version 3.1 Revision 5, April 2017 • Part 2: Security Functional Components, CCMB‐2017‐ 04‐002, Version 3.1 Revision 5, April 2017 • Part 3: Security Assurance Components, CCMB‐2017‐ 04‐003, Version 3.1 Revision 5, April 2017 [CEM] Common Methodology for Information Technology Security Evaluation, Evaluation Methodology, CCMB‐2017‐04‐004, Version 3.1 Revision 5, April 2017 [PP_PSD_V4.0] Protection Profile for Peripheral Sharing Device, Version: 4.0, 2019‐07‐19 [MOD_KM_V1.0] PP‐Module for Keyboard/Mouse Devices, Version 1.0 [MOD_VI_1.0] PP‐Module for Video/Display Devices, Version 1.0 [CFG_PSD‐KM‐ VI_V1.0] PP‐Configuration for Peripheral Sharing Device, Keyboard/Mouse Devices, and Video/Display Devices, 19 July 2019 Table 27 – References Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page A-1 of A-2 ANNEX A – LETTER OF VOLATILITY The table below provides volatility information and memory types for the Belkin Peripheral Sharing Devices. User data is not retained in any TOE device when the power is turned off. Product Models Number in each product Function, Manufacturer and Part Number Storage Type Size Power Source (if not the TOE) Volatility Contains User Data F1DN102MOD-BA-4 F1DN104MOD-BA-4 F1DN108MOD-BA-4 F1DN202MOD-BA-4 F1DN204MOD-BA-4 F1DN208MOD-BA-4 F1DN102MOD-HH-4 F1DN102MOD-PP-4 F1DN102MOD-DD-4 F1DN202MOD-HH-4 F1DN202MOD-PP-4 F1DN202MOD-DD-4 F1DN104MOD-HH-4 F1DN104MOD-PP-4 F1DN108MOD-PP-4 F1DN104MOD-DD-4 1 System Controller, Host emulators: ST Microelectronics STM32F446ZCT Embedded SRAM1 128KB Volatile May contain user data Embedded Flash2 256KB Non-Volatile No user data Embedded EEPROM3 4KB Non-Volatile No user data OTP Memory 512bytes Non-Volatile Event logs are saved 1 in Single head and 2 in Dual head models Video Controller: ST Microelectronics STM32F070C6T6 Embedded SRAM1 16KB Volatile No user data Embedded Flash2 128KB Non-Volatile No user data Embedded EEPROM3 4KB Non-Volatile No user data 2 in 2 port, 4 in 4 port or 8 in 8 port models Device emulators: ST Microelectronics STM32F070C6T6 Embedded SRAM1 6KB Connected computer Volatile May contain user data Embedded Flash2 32KB Non-Volatile No user data Embedded EEPROM3 4KB Non-Volatile No user data Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page A-2 of A-2 Product Models Number in each product Function, Manufacturer and Part Number Storage Type Size Power Source (if not the TOE) Volatility Contains User Data F1DN204MOD-HH-4 F1DN204MOD-PP-4 F1DN208MOD-PP-4 F1DN204MOD-DD-4 F1DN104MOD-XX-4 F1DN204MOD-XX-4 2 in 2 port Single head, 4 in 4 port Single head and 2 port Dual head, 8 in 8 port Single head and 4 port Dual head and 16 in 8 port Dual head EDID Emulator: ST Microelectronics M24C02- WMN6TP EEPROM4 2 KB Non-Volatile No user data Notes: 1 SRAM stores USB Host stack parameters and up to the last 4 key-codes. Data is erased during power off of the KVM, and when the user switches channels. Device emulators receive power from the individual connected computers and therefore devices are powered on as long as the associated computer is powered on and connected. 2 Flash storage is used to store firmware code. It contains no user data. Flash storage is permanently locked by fuses after initial programming to prevent rewriting. It is an integral part of the ST Microcontroller together with SRAM and EEPROM. 3 EEPROM is used to store operational parameters, such as display Plug & Play. They contain no user data. These devices receive power from the individual computers connected to the TOE, and therefore are powered on as long as the associated computer is powered on and connected. 4 EEPROM is used to store operational parameters (display Plug & Play) and contains no user data. Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page B-1 of B-2 ANNEX B – SFR DEVICE MATRIX Table 28 indicates the SFRs supported by each device. FDP_APC_EXT.1/KM FDP_APC_EXT.1/VI FDP_CDS_EXT.1(1) FDP_CDS_EXT.1(2) FDP_FIL_EXT.1/KM FDP_IPC_EXT.1(1) FDP_IPC_EXT.1(2) FDP_PDC_EXT.1 FDP_PDC_EXT.2/KM FDP_PDC_EXT.2/VI FDP_PDC_EXT.3/KM FDP_PDC_EXT.3/VI FDP_RDR_EXT.1 FDP_RIP_EXT.1 FDP_RIP.1/KM FDP_SPR_EXT.1/DP FDP_SPR_EXT.1/DVI-D FDP_SPR_EXT.1/HDMI FDP_SPR_EXT.1/USB FDP_SPR_EXT.1/VGA FDP_SWI_EXT.1 FDP_SWI_EXT.2 FDP_SWI_EXT.3 FDP_UDF_EXT.1/KM FDP_UDF_EXT.1/VI FPT_FLS_EXT.1 FPT_NTA_EXT.1 FPT_PHP.1 FPT_TST.1 FPT_TST_EXT.1 FTA_CIN_EXT.1 F1DN102MOD-BA-4 X X X X X X X X X X X X X X X X X X X X X X X X F1DN104MOD-BA-4 X X X X X X X X X X X X X X X X X X X X X X X X F1DN108MOD-BA-4 X X X X X X X X X X X X X X X X X X X X X X X X F1DN202MOD-BA-4 X X X X X X X X X X X X X X X X X X X X X X X X F1DN204MOD-BA-4 X X X X X X X X X X X X X X X X X X X X X X X X F1DN208MOD-BA-4 X X X X X X X X X X X X X X X X X X X X X X X X F1DN102MOD-HH-4 X X X X X X X X X X X X X X X X X X X X X X X X F1DN102MOD-PP-4 X X X X X X X X X X X X X X X X X X X X X X X X X F1DN102MOD-DD-4 X X X X X X X X X X X X X X X X X X X X X X X X F1DN202MOD-HH-4 X X X X X X X X X X X X X X X X X X X X X X X X F1DN202MOD-PP-4 X X X X X X X X X X X X X X X X X X X X X X X X X F1DN202MOD-DD-4 X X X X X X X X X X X X X X X X X X X X X X X X F1DN104MOD-HH-4 X X X X X X X X X X X X X X X X X X X X X X X X Belkin Peripheral Sharing Devices with Keyboard, Video, Mouse Security Target Doc No: 2149-001-D102B2 Version: 1.6 Date: 8 July 2021 Page B-2 of B-2 FDP_APC_EXT.1/KM FDP_APC_EXT.1/VI FDP_CDS_EXT.1(1) FDP_CDS_EXT.1(2) FDP_FIL_EXT.1/KM FDP_IPC_EXT.1(1) FDP_IPC_EXT.1(2) FDP_PDC_EXT.1 FDP_PDC_EXT.2/KM FDP_PDC_EXT.2/VI FDP_PDC_EXT.3/KM FDP_PDC_EXT.3/VI FDP_RDR_EXT.1 FDP_RIP_EXT.1 FDP_RIP.1/KM FDP_SPR_EXT.1/DP FDP_SPR_EXT.1/DVI-D FDP_SPR_EXT.1/HDMI FDP_SPR_EXT.1/USB FDP_SPR_EXT.1/VGA FDP_SWI_EXT.1 FDP_SWI_EXT.2 FDP_SWI_EXT.3 FDP_UDF_EXT.1/KM FDP_UDF_EXT.1/VI FPT_FLS_EXT.1 FPT_NTA_EXT.1 FPT_PHP.1 FPT_TST.1 FPT_TST_EXT.1 FTA_CIN_EXT.1 F1DN104MOD-PP-4 X X X X X X X X X X X X X X X X X X X X X X X X X F1DN108MOD-PP-4 X X X X X X X X X X X X X X X X X X X X X X X X X F1DN104MOD-DD-4 X X X X X X X X X X X X X X X X X X X X X X X X F1DN204MOD-HH-4 X X X X X X X X X X X X X X X X X X X X X X X X F1DN204MOD-PP-4 X X X X X X X X X X X X X X X X X X X X X X X X X F1DN208MOD-PP-4 X X X X X X X X X X X X X X X X X X X X X X X X X F1DN204MOD-DD-4 X X X X X X X X X X X X X X X X X X X X X X X X F1DN104MOD-XX-4 X X X X X X X X X X X X X X X X X X X X X X X X X X X X F1DN204MOD-XX-4 X X X X X X X X X X X X X X X X X X X X X X X X X X X X F1DN008KBD* X X X X X Table 28 – Security Functional Requirements and Devices *When used with another TOE device, the Belkin 2-4-8 Port Secure KVM USB Keyboard W/Lighting, F1DN008KBD contributes to the enforcement of the specified SFRs. This device is only used with another TOE device.