Crestron DigitalMedia NVX®AV-over-IP v5.2
Security Target
Version 1.0
2022-2-15
Prepared for:
Crestron Electronics, Inc.
15 Volvo Drive
Rockleigh, New Jersey 07647
Prepared by:
Common Criteria Testing Laboratory
6841 Benjamin Franklin Drive
Columbia, Maryland 21046
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Table of Contents
1 Security Target Introduction.................................................................................................................1
1.1 Security Target, Target of Evaluation, and Common Criteria Identification..................................1
1.2 Conformance Claims.......................................................................................................................2
1.3 Conventions....................................................................................................................................4
1.4 Abbreviations and Acronyms .........................................................................................................4
1.5 TOE Overview .................................................................................................................................6
1.6 TOE Description..............................................................................................................................6
1.6.1 Physical Scope .........................................................................................................................6
1.6.2 Logical Scope...........................................................................................................................7
1.7 TOE Documentation .......................................................................................................................9
1.8 Excluded Functionality ...................................................................................................................9
2 Security Problem Definition................................................................................................................11
3 Security Objectives .............................................................................................................................12
4 IT Security Requirements....................................................................................................................13
4.1 Extended Requirements...............................................................................................................13
4.2 TOE Security Functional Requirements........................................................................................13
4.2.1 Security Audit (FAU)..............................................................................................................15
4.2.2 Cryptographic Support (FCS).................................................................................................17
4.2.3 Identification and Authentication (FIA).................................................................................22
4.2.4 Security Management (FMT).................................................................................................24
4.2.5 Protection of the TSF (FPT)....................................................................................................25
4.2.6 TOE Access (FTA)...................................................................................................................26
4.2.7 Trusted Path/Channels (FTP).................................................................................................26
4.3 TOE Security Assurance Requirements ........................................................................................27
5 TOE Summary Specification................................................................................................................28
5.1 Security Audit ...............................................................................................................................28
5.1.1 Audit Data Generation ..........................................................................................................28
5.1.2 Audit Storage and Audit Record Export................................................................................28
5.2 Cryptographic Support .................................................................................................................29
5.2.1 Cryptographic Operations.....................................................................................................30
5.2.2 Random Bit Generation.........................................................................................................31
5.2.3 Cryptographic Key Generation and Establishment...............................................................31
5.2.4 Cryptographic Key Destruction .............................................................................................31
5.2.5 Cryptographic Protocols........................................................................................................32
5.3 Identification and Authentication ................................................................................................34
5.3.1 User Identification and Authentication.................................................................................34
5.3.2 Authentication Failure Management....................................................................................35
5.3.3 X.509 Certificate Validation...................................................................................................35
5.3.4 X.509 Certificate Authentication...........................................................................................36
5.3.5 X.509 Certificate Requests ....................................................................................................36
5.4 Security Management ..................................................................................................................36
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5.4.1 Security Roles and Specification of Management Functions................................................36
5.4.2 Management of Security Functions Behavior........................................................................37
5.4.3 Management of TSF Data......................................................................................................37
5.5 Protection of the TSF....................................................................................................................37
5.5.1 Protection of Administrator Passwords................................................................................37
5.5.2 Protection of TSF Data (for reading of all pre-shared, symmetric and private keys) ...........38
5.5.3 TSF Testing ............................................................................................................................38
5.5.4 Trusted Update .....................................................................................................................38
5.5.5 Reliable Time Stamps............................................................................................................39
5.6 TOE Access....................................................................................................................................39
5.6.1 Access Banner .......................................................................................................................39
5.6.2 Session Termination..............................................................................................................39
5.7 Trusted Path/Channels.................................................................................................................40
6 Protection Profile Claims ....................................................................................................................41
7 Rationale.............................................................................................................................................42
7.1 TOE Summary Specification Rationale .........................................................................................42
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List of Figures and Tables
Table 1: Abbreviations and Acronyms ..........................................................................................................4
Table 2: Third Party Components .................................................................................................................7
Table 3: Excluded Functionality ....................................................................................................................9
Table 4: Security Objectives for the Operational Environment..................................................................12
Table 5: TOE Security Functional Components...........................................................................................13
Table 6: Security Functional Requirements and Auditable Events.............................................................15
Table 7: Assurance Components.................................................................................................................27
Table 8: Cryptographic Functions Implemented by OpenSSL.....................................................................29
Table 9: Key Clearing...................................................................................................................................31
Table 10: Console Certificate Management Commands ............................................................................37
Table 11: Security Functions vs. Requirements Mapping...........................................................................42
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1 Security Target Introduction
This section introduces the Target of Evaluation (TOE) and provides the Security Target (ST) and TOE
references, TOE overview, and TOE description. It also contains the ST and TOE conformance claims, ST
conventions, glossary, and list of abbreviations.
This ST includes the following additional sections:
• Security Problem Definition (Section 2)—describes the threats and assumptions that define the
security problem to be addressed by the TOE and its environment
• Security Objectives (Section 3)—describes the security objectives for the TOE and its operational
environment necessary to counter the threats and satisfy the assumptions that define the security
problem
• IT Security Requirements (Section 4)—specifies the security functional requirements (SFRs) and
security assurance requirements (SARs) to be met by the TOE
• TOE Summary Specification (Section 5)—describes the security functions of the TOE and how they
satisfy the SFRs
• Protection Profile Claims (Section 6)—provides rationale supporting the claims for conformance
of the ST and the TOE to [cPPND]
• Rationale (Section 7)—provides mappings and rationale for the security problem definition,
security objectives, security requirements, and security functions to justify their completeness,
consistency, and suitability.
1.1 Security Target, Target of Evaluation, and Common Criteria Identification
ST Title: Crestron DigitalMedia NVX®AV-over-IP v5.2 Security Target
ST Version: Version 1.0
ST Date: 2022-2-15
TOE Identification: Crestron DigitalMedia NVX®AV-over-IP v5.2
The TOE includes the following appliance models, each with firmware version 5.2.4651.00030:
Appliance Model
DM-NVX-350
DM-NVX-350C
DM-NVX-351
DM-NVX-351C
DM-NVX-352
DM-NVX-352C
DM-NVX-E30
DM-NVX-E30C
DM-NVX-D30
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DM-NVX-D30C
DM-NVX-D80-IOAV
DM-NVX-363
DM-NVX-363C
DM-NVX-E760
DM-NVX-E760C
Each appliance contains an Intel Arria 10 SX SoC FPGA that includes an ARM Cortex-A9 MPCore processor
implementing the ARMv7-A microarchitecture. “C” indicates that the model is a form factor with a chassis
card.
TOE Developer: Crestron Electronics, Inc.
Evaluation Sponsor: Crestron Electronics, Inc.
CC Identification: Common Criteria for Information Technology Security Evaluation, Version 3.1, Revision
5, April 2017.
1.2 Conformance Claims
This ST and the TOE it describes are conformant to the following CC specifications:
• Common Criteria for Information Technology Security Evaluation Part 2: Security Functional
Components, Version 3.1 Revision 5, April 2017
• Part 2 Extended
• Common Criteria for Information Technology Security Evaluation Part 3: Security Assurance
Components, Version 3.1 Revision 5, April 2017
• Part 3 Conformant.
This ST and the TOE it describes are conformant to the following Protection Profile:
• collaborative Protection Profile for Network Devices, Version 2.2e, 23 March 2020 [cPPND], including
the following optional and selection-based SFRs: FAU_STG.1, FCS_HTTPS_EXT.1; FCS_NTP_EXT.1;
FCS_SSHS_EXT.1; FCS_TLSC_EXT.1; FCS_TLSS_EXT.1; FIA_X509_EXT.1/Rev; FIA_X509_EXT.2;
FIA_X509_EXT.3; and FMT_MTD.1/CryptoKeys.
The following NIAP Technical Decisions are applicable to the claimed Protection Profile:
• TD0527 – Updates to Certificate Revocation Testing (FIA_X509_EXT.1)
o This TD is applicable to the TOE but relates solely to evaluation activities so it does not affect
the ST.
• TD0528 – NIT Technical Decision for Missing EAs for FCS_NTP_EXT.1.4
o This TD is applicable to the TOE but relates solely to evaluation activities so it does not affect
the ST.
• TD0536 – NIT Technical Decision for Update Verification Inconsistency
o This TD is applicable to the TOE but relates solely to evaluation activities so it does not affect
the ST.
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• TD0537 – NIT Technical Decision for Incorrect reference to FCS_TLSC_EXT.2.3
o This TD is not applicable to the TOE since FCS_TLSC_EXT.2 is not included in the ST.
• TD0538 – NIT Technical Decision for Outdated link to allowed-with list
o This TD is a semantic issue with the claimed PP that was corrected. It does not affect the ST
or the evaluation of the TOE.
• TD0546 – NIT Technical Decision for DTLS - clarification of Application Note 63
o This TD is not applicable to the TOE because DTLS is not used.
• TD0547 – NIT Technical Decision for Clarification on developer disclosure of AVA_VAN
o This TD is applicable to the TOE.
• TD0555 – NIT Technical Decision for RFC Reference incorrect in TLSS Test
o This TD is applicable to the TOE but relates solely to evaluation activities so it does not affect
the ST.
• TD0556 – NIT Technical Decision for RFC 5077 question
o This TD is applicable to the TOE but relates solely to evaluation activities so it does not affect
the ST.
• TD0563 – NiT Technical Decision for Clarification of audit date information
o This TD is applicable to the TOE.
• TD0564 – NiT Technical Decision for Vulnerability Analysis Search Criteria
o This TD is applicable to the TOE but relates solely to evaluation activities so it does not affect
the ST.
• TD0569 – NIT Technical Decision for Session ID Usage Conflict in FCS_DTLSS_EXT.1.7
o This TD is applicable to the TOE but relates to application notes and evaluation activities so it
does not affect the ST.
• TD0570 – NiT Technical Decision for Clarification about FIA_AFL.1
o This TD is a clarification to the requirement and therefore is generally applicable to the TOE
but does not change any of the requirements.
• TD0571 – NiT Technical Decision for Guidance on how to handle FIA_AFL.1
o This TD is a clarification to the requirement and therefore is generally applicable to the TOE
but does not change any of the requirements.
• TD0572 – NiT Technical Decision for Restricting FTP_ITC.1 to only IP address identifiers
o This TD is a clarification to the FCS_TLSC_EXT and FTP_ITC.1 requirements and therefore is
generally applicable to the TOE but does not change any of the requirements.
• TD0580 – NiT Technical Decision for clarification about use of DH14 in NDcPPv2.2e.
o This TD is a clarification to the DH14 requirement and modifies the selections in the SFR.
Therefore it is applicable to the ST.
• TD0581– NiT Technical Decision for Elliptic curve-based key establishment and NIST SP 800-
56Arev3
o This TD adds a selection for Elliptic curve-based key establishment based on NIST SP 800-
56Arev3 and is therefore applicable to the ST as it has been selected.
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• TD0591– NIT Technical Decision for Virtual TOEs and hypervisors
o This TD modifies an assumption and therefore is applicable to the TOE.
• TD0592– NIT Technical Decision for Local Storage of Audit Records
o This TD is applicable to the TOE, though it has no material effect on the ST.
1.3 Conventions
The following conventions are used in this document:
• Security Functional Requirements—Part 1 of the CC defines the approved set of operations that
may be applied to functional requirements: iteration; selection; assignment; and refinement.
• Iteration—allows a component to be used more than once with varying operations. In this
ST, the only iterated requirements are those reproduced from [cPPND], which uses
descriptive strings to distinguish iterations of a requirement. For example, iterations of
FCS_COP.1 are identified FCS_COP.1/DataEncryption, FCS_COP.1/SigGen, FCS_COP.1/Hash,
and FCS_COP.1/KeyedHash.
• Selection—allows the specification of one or more elements from a list. Selections completed
in the ST are indicated using bold italics and are enclosed by brackets (e.g., [selection]).
• Assignment—allows the specification of an identified parameter. Assignments completed in
the ST are indicated using bold text and are enclosed by brackets (e.g., [assignment]). An
assignment within a selection is identified in bold italics and with embedded bold brackets
(e.g., [[selected-assignment]]).
• Refinement—allows the addition of details. Refinements made in the ST of requirements
drawn from [cPPND] would be indicated using bold for additions and strike-through for
deletions (e.g., “… some all objects).
• Other sections of the ST—other sections of the ST use bolding and/or different fonts (such as
Courier) to highlight text of special interest, such as captions, commands, or filenames specific
to the TOE.
1.4 Abbreviations and Acronyms
Table 1: Abbreviations and Acronyms
Abbreviation Definition
AES Advanced Encryption Standard
CBC Cipher Block Chaining
DH Diffie-Hellman
DRBG Deterministic Random Bit Generator
DSA Digital Signature Algorithm
ECDSA Elliptic Curve Digital Signature Algorithm
HMAC Hash-based Message Authentication Code
LDAP Lightweight Directory Access Protocol
MAC Message Authentication Code
NTP Network Time Protocol
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Abbreviation Definition
NVX Shorthand for the TOE: Crestron Digital Media NVX Series
SHA Secure Hash Algorithm
TLS Transport Layer Security
TOE Target of Evaluation
TSF TOE Security Functionality
USB Universal Serial Bus
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1.5 TOE Overview
The TOE is Crestron DigitalMedia NVX®AV-over-IP v5.2. NVX is a series of audio & video (AV) over IP
network devices that encrypt, decrypt and transmit HDMI video, USB and analog audio data over
customer networks. These communication streams use an AES-based HDCP standard that is not covered
by the [cPPND] and therefore is not evaluated. The focus of this evaluation is on the TOE functionality
supporting the claims in the collaborative Protection Profile for Network Devices ([cPPND].
The security functionality specified in [cPPND] includes protection of communications between the TOE
and external IT entities, identification and authentication of administrators, auditing of security-relevant
events, ability to verify the source and integrity of updates to the TOE, and use of NIST-validated
cryptographic mechanisms. The [cPPND] does not define requirements for encryption of audio and video
so the TOE focuses on the security of the network channels used for syslog, management, and
authentication.
1.6 TOE Description
The TOE is a digital video and audio distribution network device that switches 4K video sources and
displays at 60 frames per second (fps) with full 4:4:4 color sampling, High Dynamic Range (HDR) video
support, standard 1-Gigabit Ethernet infrastructure, and Pixel Perfect Processing technology to provide
video transport in all applications. A video signal is encoded and decoded to achieve imperceptible end-
to-end latency of less than 1 frame. The image quality of the source is maintained across a 1-Gigabit
network at any resolution up to 4K60 4:4:4. The digital video and audio transport and encoding/decoding
are not evaluated.
For the purpose of this evaluation, the TOE is treated as a network device offering NIST validated
cryptographic functions, security auditing, secure administration, trusted updates, self-tests, and secure
connections to other servers (e.g., to export audit records), protected using HTTPS/TLS and SSH.
Cryptographic functionality is performed by the TOE’s ‘Crestron Crypto Kernel for Open SSL’ software
module that includes third-party SafeLogic OpenSSL in support of higher level protocols (TLS, SSH). The
module’s FIPS-Approved cryptographic algorithms have obtained CAVP certificates.
The TOE audits security relevant events, stores audit records locally, and can be configured to forward its
audit records to an external syslog server in the network environment. An administrator can configure the
TOE to solicit time from an NTP server, and alternatively the administrator can manually set the TOE’s
time.
The TOE: uses TLS to protect syslog; offers a management GUI protected by TLS/HTTPS; and provides a
management Command Line Interface (CLI) protected by SSH.
Administrators are able to query the current version of the product firmware and manage the security
functions of the TOE, including performing updates on the product. Public/private keys are used to
provide digital signatures for protection of the update files.
The TOE provides self-tests to ensure the integrity and correct operation of the TOE.
1.6.1 Physical Scope
The NVX TOE is deployed as a single physical appliance that serves as one endpoint for an audio/visual
(AV) over IP (Transmission Control Protocol/Internet Protocol (TCP/IP)) connection. The NVX models are
available as surface-mountable endpoints, OPS (Open Pluggable Specification) endpoints and chassis-
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based cards. Models are available as encoder-only, decoder-only, or combined encoder/decoder
products. The NVX Models included in the TOE are identified in Section 1.1.
The NVX Models differ in terms of form factor, function (sender, receiver), number and types of external
control and data ports and maximum Input/Output resolution. The NVX models use the same firmware
image files and provide equivalent security-relevant functionality. There are no security relevant
differences between the appliance models.
Each TOE appliance includes an Intel Arria 10 SoC FPGA that includes an ARM Cortex-A9 MPCore processor
implementing the ARMv7-A microarchitecture and an Angstrom Linux v2014.12 operating system, which
use version 4.19 of the Linux kernel. The operating system has been hardened; does not permit operators
(even an authorized administrator) access to the OS; and includes NVX-developed firmware. Additionally,
the TOE includes the following third party components:
Table 2: Third Party Components
Component Version
lighttpd 1.4.52
Redis 5.0.5
OpenSSH 8.3p1
Net-SNMP 5.7.2.1
NTPsec 1.1.6
SafeLogic OpenSSL 1.0.2x-fips
The administrator gains local access to the CLI from a workstation directly connected to a network port
and using SSH client software, and remote access to the web management interface using a browser.
The TOE in its evaluated configuration requires the following components in its operational environment:
• A TLS-protected syslog server that receives audit events from the TOE
• NTP servers with which the TOE can synchronize its clock
• A client workstation for administrator access to the web GUI and CLI with:
o A supported browser:
▪ Firefox® web browser, version 31 and later
▪ Internet Explorer web browser, version 11 and later
▪ Microsoft Edge web browser
▪ Safari® web browser, version 6 and later
▪ Chrome™ web browser, version 31 and later.
o An SSH Client for local and remote access to the CLI.
1.6.2 Logical Scope
This section summarizes the security functions provided by the TOE:
• Security audit
• Cryptographic support
• Identification and authentication
• Security management
• Protection of the TSF
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• TOE access
• Trusted path/channels.
1.6.2.1 Security Audit
The TOE generates audit events associated with identification and authentication, management, updates,
and user sessions. The TOE can store the events in a local log and export them to a syslog server using a
TLS protected channel.
1.6.2.2 Cryptographic Support
The TOE provides CAVP certified cryptography in support of its SSH, TLS, and NTP implementations and
for verifying TOE update package signatures. Cryptographic services include key management, random bit
generation, symmetric encryption and decryption, digital signature, and secure hashing.
1.6.2.3 Identification and Authentication
The TOE requires users to be identified and authenticated before they can use functions mediated by the
TOE, with the exception of reading the login banner. The TOE authenticates a user’s credentials (password,
key) using a local mechanism provided by the TOE. The TOE also provides X.509 certificate checking for its
TLS connections.
1.6.2.4 Security Management
The TOE provides CLI and web-based management interfaces that an administrator can access remotely
via a network port. The CLI can also be accessed locally by directly connecting to a network port and using
SSH. Remote connections to the management interface are protected with SSH for the CLI and HTTPS for
the GUI. The management interface is limited to the authorized administrator.
1.6.2.5 Protection of the TSF
The TOE implements various self-protection mechanisms. The TOE performs self-tests that cover the
correct operation of the TOE. It provides functions necessary to securely update the TOE. It relies upon
either manually provided time or an NTP server in its environment to ensure reliable timestamps. It
protects sensitive data such as passwords and cryptographic keys stored on the TOE’s internal Flash so
that they are not accessible even by an authorized administrator.
1.6.2.6 TOE Access
The TOE will terminate local and remote interactive sessions after a configurable period of inactivity. The
TOE additionally provides the capability for administrators to terminate their own interactive sessions.
The TOE can be configured to display an advisory and consent warning message before establishing a user
session.
1.6.2.7 Trusted Path/Channels
The TOE provides local administration which is subject to physical protection. To access the TOE locally,
an administrator must directly connect their workstation to a network port and use SSH and successfully
login. When accessed remotely, the CLI and GUI management interfaces are protected by SSH and TLS
respectively, thus ensuring protection against modification and disclosure.
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The TOE protects communications with the external syslog servers from modification and disclosure by
using TLS.
1.7 TOE Documentation
The TOE is supplied with the following guidance documentation that describes the installation process for
the TOE and provides guidance for configuration and secure use of its security features:
• Crestron DigitalMedia NVX Series v5.2 Common Criteria Evaluated Configuration Guide (CCECG),
Version 1.0
• DM-NVX-350, DM-NVX-351, and DM-NVX-352 Quick Start (Doc.8391C)
• DM-NVX-350C, DM-NVX-351C, and DM-NVX-352C Quick Start (Doc. 8392B)
• DM-NVX-E30 and DM-NVX-D30 Quick Start (Doc.8906A)
• DM-NVX-E30C/DM-NVX-D30C Quick Start (Doc. 8346A)
• DM-NVX-D80-IOAV Quick Start (Doc. 8526A)
• DM-NVX-363 and DM-NVX-360 Quick Start (Doc. 8634)
• DM-NVX-363C and DM-NVX-360C Quick Start (Doc. 8636)
• DM-NVX-E760 Quick Start (Doc. 8646B)
• DM-NVX-E760C Quick Start (Doc. 8638B)
1.8 Excluded Functionality
The list below identifies features or protocols that are not evaluated or must be disabled, and the rationale
why. Note that this does not mean the features cannot be used in the evaluated configuration (unless
explicitly stated so). It means that the features were not evaluated and/or validated by an independent
third party and the functional correctness of the implementation is vendor assertion. Evaluated
functionality is scoped exclusively to the security functional requirements specified in this Security Target.
In particular, only the following protocols implemented by the TOE have been tested, and only to the
extent specified by the security functional requirements: TLS, HTTPS, SSH, NTP authentication. The
features below are out of scope.
Table 3: Excluded Functionality
Feature Description
Net-SNMP, Telnet and HTTP
Management Protocols
Net-SNMP, Telnet and HTTP are disabled by default and must
not be enabled in the evaluated configuration. Only SSH and
HTTPS are used for the remote management protocols to
manage the TOE.
External LDAP/AD
authentication
Users must be authenticated using the local authentication
method. External LDAP/AD must not be used.
802.1X, SCIP traffic, AES-based
HDCP
The TOE uses SCIP for device –to-device communication,
802.1X is used for network access, and AES based HDCP for
Audio and video. The TOE is not distributed and therefore
device-to-device communication and SCIP are not within
scope of the evaluation. Additionally, the [cPPND] does not
define requirements for these types of traffic/protocols and
therefore they have not been evaluated.
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Feature Description
Crestron XiO Cloud® service Allows supported Crestron devices across an enterprise to be
managed and configured from one central and secure
location in the cloud. It is disabled in the evaluated
configuration.
Crestron Toolbox™ application Crestron Toolbox™ application is excluded from the
evaluated configuration. The evaluation only includes access
to the GUI via browser.
Any features not associated
with SFRs in claimed [cPPND],
[cPPND] forbids adding additional requirements to the
Security Target (ST). If additional functionalities or products
are mentioned in the ST, it is for completeness only.
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2 Security Problem Definition
This ST includes by reference the Security Problem Definition (comprising threat statements, assumptions,
and organizational security policies) from [cPPND]. The PP offers additional information about the threats,
assumptions, and organizational security policies, but that has not been reproduced here and the PP
should be consulted if there is interest in that material.
In general, the [cPPND] has presented a Security Problem Definition appropriate for network
infrastructure devices, and as such is applicable to the TOE.
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3 Security Objectives
The [cPPND] defines the following security objectives for the operational environment of the TOE.
Table 4: Security Objectives for the Operational Environment
Objective Description
OE.PHYSICAL Physical security, commensurate with the value of the TOE and the
data it contains, is provided by the environment.
OE.NO_GENERAL_PURPOSE There are no general-purpose computing capabilities (e.g.,
compilers or user applications) available on the TOE, other than
those services necessary for the operation, administration and
support of the TOE.
OE.NO_THRU_TRAFFIC_PROTECTION The TOE does not provide any protection of traffic that traverses it.
It is assumed that protection of this traffic will be covered by other
security and assurance measures in the operational environment.
OE.TRUSTED_ADMIN Security Administrators are trusted to follow and apply all guidance
documentation in a trusted manner.
For TOEs supporting X.509v3 certificate-based authentication, the
Security Administrator(s) are assumed to monitor the revocation
status of all certificates in the TOE's trust store and to remove any
certificate from the TOE’s trust store in case such certificate can no
longer be trusted.
OE.UPDATES The TOE firmware and software is updated by an Administrator on a
regular basis in response to the release of product updates due to
known vulnerabilities.
OE.ADMIN_CREDENTIALS_SECURE The Administrator’s credentials (private key) used to access the TOE
must be protected on any other platform on which they reside.
OE.RESIDUAL_INFORMATION The Security Administrator ensures that there is no unauthorized
access possible for sensitive residual information (e.g. cryptographic
keys, keying material, PINs, passwords etc.) on networking
equipment when the equipment is discarded or removed from its
operational environment.
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4 IT Security Requirements
This section defines the Security Functional Requirements (SFRs) and Security Assurance Requirements
(SARs) that serve to represent the security functional claims for the TOE and to scope the evaluation effort.
The SFRs have all been drawn from [cPPND]. As such, operations on SFRs already performed in that PP are
not identified here. Rather, the SFRs have been copied from [cPPND] and any formatting used in that PP
has been removed. Operations performed on SFRs in the writing of this ST are identified in accordance
with the conventions described in Section 1.3.
The SARs are the set of SARs specified in [cPPND].
4.1 Extended Requirements
All of the extended requirements in this ST have been drawn from [cPPND]. The [cPPND] defines the
following extended SFRs and since they are not redefined in this ST, the [cPPND] should be consulted for
more information in regards to these CC extensions.
• FAU_STG_EXT.1—Protected Audit Event Storage
• FCS_HTTPS_EXT.1 – HTTPS Protocol
• FCS_NTP_EXT.1—NTP Protocol
• FCS_RBG_EXT.1—Random Bit Generation
• FCS_SSHS_EXT.1—SSH Server Protocol
• FCS_TLSC_EXT.1—TLS Client Protocol
• FCS_TLSS_EXT.1—TLS Server Protocol
• FIA_PMG_EXT.1—Password Management
• FIA_UAU_EXT.2—Password-Based Authentication Mechanism
• FIA_UIA_EXT.1—User Identification and Authentication
• FIA_X509_EXT.1—X.509 Certificate Validation
• FIA_X509_EXT.2—X.509 Certificate Authentication
• FIA_X509_EXT.3—X.509 Certificate Requests
• FPT_APW_EXT.1—Protection of Administrator Passwords
• FPT_SKP_EXT.1—Protection of TSF Data
• FPT_STM_EXT.1—Reliable Time Stamps
• FPT_TST_EXT.1—TSF Testing
• FPT_TUD_EXT.1—Trusted Update
• FTA_SSL_EXT.1—TSF-Initiated Session Locking
4.2 TOE Security Functional Requirements
The following table identifies the SFRs that are satisfied by the TOE.
Table 5: TOE Security Functional Components
Requirement Class Requirement Component
FAU: Security audit FAU_GEN.1—Audit Data Generation
FAU_GEN.2—User Identity Association
FAU_STG.1 – Protected Audit Trail Storage
FAU_STG_EXT.1—Protected Audit Event Storage
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Requirement Class Requirement Component
FCS: Cryptographic support FCS_CKM.1—Cryptographic Key Generation
FCS_CKM.2—Cryptographic Key Establishment
FCS_CKM.4—Cryptographic Key Destruction
FCS_COP.1/DataEncryption—Cryptographic Operation (AES Data
Encryption/Decryption)
FCS_COP.1/SigGen—Cryptographic Operation (Signature Generation
and Verification)
FCS_COP.1/Hash—Cryptographic Operation (Hash Algorithm)
FCS_COP.1/KeyedHash—Cryptographic Operation (Keyed Hash
Algorithm)
FCS_HTTPS_EXT.1 – HTTPS Protocol
FCS_NTP_EXT.1—NTP Protocol
FCS_RBG_EXT.1—Random Bit Generation
FCS_SSHS_EXT.1—SSH Server Protocol
FCS_TLSC_EXT.1—TLS Client Protocol without Mutual Authentication
FCS_TLSS_EXT.1—TLS Server Protocol without Mutual Authentication
FIA: Identification and authentication FIA_AFL.1—Authentication Failure Management
FIA_PMG_EXT.1—Password Management
FIA_UAU_EXT.2—Password-Based Authentication Mechanism
FIA_UAU.7—Protected Authentication Feedback
FIA_UIA_EXT.1—User Identification and Authentication
FIA_X509_EXT.1/Rev—X.509 Certificate Validation
FIA_X509_EXT.2—X.509 Certificate Authentication
FIA_X509_EXT.3—X.509 Certificate Requests
FMT_MOF.1/ManualUpdate—Management of Security Functions
Behavior
FMT_MTD.1/CoreData—Management of TSF Data
FMT_MTD.1/CryptoKeys—Management of TSF Data
FMT_SMF.1—Specification of Management Functions
FMT_SMR.2—Restrictions on Security Roles
FPT: Protection of the TSF FPT_APW_EXT.1—Protection of Administrator Passwords
FPT_SKP_EXT.1—Protection of TSF Data (for reading of all pre-shared,
symmetric and private keys)
FPT_STM_EXT.1—Reliable Time Stamps
FPT_TST_EXT.1—TSF Testing
FPT_TUD_EXT.1—Trusted update
FTA: TOE access FTA_SSL_EXT.1—TSF-Initiated Session Locking
FTA_SSL.3—TSF-Initiated Termination
FTA_SSL.4—User-Initiated Termination
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Requirement Class Requirement Component
FTA_TAB.1—Default TOE Access Banners
FTP: Trusted path/channels FTP_ITC.1—Inter-TSF Trusted Channel
FTP_TRP.1/Admin—Trusted Path
4.2.1 Security Audit (FAU)
4.2.1.1 Audit Data Generation (FAU_GEN.1)
FAU_GEN.1.1 The TSF shall be able to generate an audit record of the following auditable events:
a) Start-up and shut-down of the audit functions;
b) All auditable events for the not specified level of audit; and
c) All administrative actions comprising:
• Administrative login and logout (name of user account shall be logged if
individual user accounts are required for Administrators).
• Changes to TSF data related to configuration changes (in addition to the
information that a change occurred it shall be logged what has been
changed).
• Generating/import of, changing, or deleting of cryptographic keys (in addition
to the action itself a unique key name or key reference shall be logged).
• Resetting passwords (name of related user account shall be logged).
• [no other actions];
d) Specifically defined auditable events listed in Table 6.
FAU_GEN.1.2 The TSF shall record within each audit record at least the following information:
a) Date and time of the event, type of event, subject identity, and the outcome
(success or failure) of the event; and
b) For each audit event type, based on the auditable event definitions of the
functional components included in the cPP/ST, information specified in column
three of Table 6.
Table 6: Security Functional Requirements and Auditable Events
Requirement Auditable Events Additional Audit Record Contents
FAU_GEN.1 None. None.
FAU_GEN.2 None. None.
FAU_STG.1 None. None.
FAU_STG_EXT.1 None. None.
FCS_CKM.1 None. None.
FCS_CKM.2 None. None.
FCS_CKM.4 None. None.
FCS_COP.1/DataEncryption None. None.
FCS_COP.1/SigGen None. None.
FCS_COP.1/Hash None. None.
FCS_COP.1/KeyedHash None. None.
FCS_HTTPS_EXT.1 Failure to establish a HTTPS session Reason for failure
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Requirement Auditable Events Additional Audit Record Contents
FCS_NTP_EXT.1 • Configuration of a new time server
• Removal of configured time server
Identity of new/removed time
server
FCS_RBG_EXT.1 None. None.
FCS_SSHS_EXT.1 Failure to establish an SSH session Reason for failure
FCS_TLSC_EXT.1 Failure to establish a TLS session Reason for failure
FCS_TLSS_EXT.1 Failure to establish a TLS session Reason for failure
FIA_AFL.1 Unsuccessful login attempts limit is met
or exceeded.
Origin of the attempt (e.g., IP
address).
FIA_PMG_EXT.1 None. None.
FIA_UIA_EXT.1 All use of identification and
authentication mechanism.
Origin of the attempt (e.g., IP
address).
FIA_UAU_EXT.2 All use of identification and
authentication mechanism.
Origin of the attempt (e.g., IP
address).
FIA_UAU.7 None. None.
FIA_X509_EXT.1/Rev • Unsuccessful attempt to validate a
certificate
• Any addition, replacement or
removal of trust anchors in the
TOE’s trust store
• Reason for failure of certificate
validation
• Identification of certificates
added, replaced or removed as
trust anchor in the TOE’s trust
store
FIA_X509_EXT.2 None. None.
FIA_X509_EXT.3 None. None.
FMT_MOF.1/ManualUpdate Any attempt to initiate a manual
update.
None.
FMT_MTD.1/CoreData None. None.
FMT_MTD.1/CryptoKeys None. None.
FMT_SMF.1 All management activities of TSF data. None.
FMT_SMR.2 None. None.
FPT_SKP_EXT.1 None. None.
FPT_APW_EXT.1 None. None.
FPT_TST_EXT.1 None. None.
FPT_TUD_EXT.1 Initiation of update; result of the
update attempt (success or failure)
None.
FPT_STM_EXT.1 Discontinuous changes to time – either
Administrator actuated or changed via
an automated process.
(Note that no continuous changes to
time need to be logged. See also
application note on FPT_STM_EXT.1).
For discontinuous changes to time:
The old and new values for the
time. Origin of the attempt to
change time for success and failure
(e.g., IP address).
FTA_SSL_EXT.1 (if “terminate
the session” is selected)
The termination of a local session by
the session locking mechanism.
None.
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Requirement Auditable Events Additional Audit Record Contents
FTA_SSL.3 The termination of a remote session by
the session locking mechanism.
None.
FTA_SSL.4 The termination of an interactive
session.
None.
FTA_TAB.1 None. None.
FTP_ITC.1 • Initiation of the trusted channel.
• Termination of the trusted channel.
• Failure of the trusted channel
functions.
Identification of the initiator and
target of failed trusted channels
establishment attempt.
FTP_TRP.1/Admin • Initiation of the trusted path.
• Termination of the trusted path.
• Failure of the trusted path
functions.
None.
4.2.1.2 User Identity Association (FAU_GEN.2)
FAU_GEN.2.1 For audit events resulting from actions of identified users, the TSF shall be able to
associate each auditable event with the identity of the user that caused the event.
4.2.1.3 Protected Audit Trail Storage (FAU_STG.1)
FAU_STG.1.1 The TSF shall protect the stored audit records in the audit trail from unauthorized
deletion.
FAU_STG.1.2 The TSF shall be able to prevent unauthorized modifications to the stored audit records
in the audit trail.
4.2.1.4 Protected Audit Event Storage (FAU_STG_EXT.1)
FAU_STG_EXT.1.1 The TSF shall be able to transmit the generated audit data to an external IT entity
using a trusted channel according to FTP_ITC.1.
FAU_STG_EXT.1.2 The TSF shall be able to store generated audit data on the TOE itself. In addition
[The TOE shall consist of a single standalone component that stores audit data
locally].
FAU_STG_EXT.1.3 The TSF shall [overwrite previous audit records according to the following rule:
[overwriting the oldest log record first]] when the local storage space for audit data
is full.
4.2.2 Cryptographic Support (FCS)
4.2.2.1 Cryptographic Key Generation (FCS_CKM.1)
FCS_CKM.1.1 The TSF shall generate asymmetric cryptographic keys in accordance with a specified
cryptographic key generation algorithm: [
• RSA schemes using cryptographic key sizes of 2048-bit or greater that meet the
following: FIPS PUB 186-4, “Digital Signature Standard (DSS)”, Appendix B.3;
• ECC schemes using “NIST curves” [P-256, P-384, P-521] that meet the following:
FIPS PUB 186-4, “Digital Signature Standard (DSS)”, Appendix B.4;
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• FFC schemes using cryptographic key sizes of 2048-bit or greater that meet the
following: FIPS PUB 186-4, “Digital Signature Standard (DSS)”, Appendix B.1;
• FFC Schemes using ‘safe-prime’ groups that meet the following: “NIST Special
Publication 800-56A Revision 3, Recommendation for Pair-Wise Key
Establishment Schemes Using Discrete Logarithm Cryptography” and [RFC 3526]
].
4.2.2.2 Cryptographic Key Establishment (FCS_CKM.2)
FCS_CKM.2.11
The TSF shall perform cryptographic key establishment in accordance with a specified
cryptographic key establishment method: [
• Elliptic curve-based key establishment schemes that meets the following: NIST
Special Publication 800-56A Revision 3, “Recommendation for Pair-Wise Key
Establishment Schemes Using Discrete Logarithm Cryptography”;
• Finite field-based key establishment schemes that meet the following: NIST
Special Publication 800-56A Revision 2, “Recommendation for Pair-Wise Key
Establishment Schemes Using Discrete Logarithm Cryptography”;
• FFC Schemes using “safe-prime” groups that meet the following: ‘NIST Special
Publication 800-56A Revision 3, “Recommendation for Pair-Wise Key
Establishment Schemes Using Discrete Logarithm Cryptography” and [groups
listed in RFC 35262
]
].
4.2.2.3 Cryptographic Key Destruction (FCS_CKM.4)
FCS_CKM.4.1 The TSF shall destroy cryptographic keys in accordance with a specified cryptographic key
destruction method
• For plaintext keys in volatile storage, the destruction shall be executed by a
[single overwrite consisting of [zeroes]];
• For plaintext keys in non-volatile storage, the destruction shall be executed by
the invocation of an interface provided by a part of the TSF that [
o logically addresses the storage location of the key and performs a
[single-pass] overwrite consisting of [a new value of the key]];
that meets the following: No Standard.
4.2.2.4 Cryptographic Operation (AES Data Encryption/Decryption) (FCS_COP.1/DataEncryption)
FCS_COP.1.1/DataEncryption The TSF shall perform encryption/decryption in accordance with a
specified cryptographic algorithm AES used in [CBC, CTR, GCM] mode and
cryptographic key sizes [128 bits, 256 bits] that meet the following: AES
as specified in ISO 18033-3, [CBC as specified in ISO 10116, CTR as
specified in ISO 10116, GCM as specified in ISO 19772].
1
Modified by TD 0581 to allow for selection of Elliptic curve-based key establishment schemes that
meet NIST Special Publication 800-56A Revision 3.
2
Modified by TD0580 to clarify requirements for RFCs are restricted to groups.
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4.2.2.5 Cryptographic Operation (Signature Generation and Verification) (FCS_COP.1/SigGen)
FCS_COP.1.1/SigGen The TSF shall perform cryptographic signature services (generation and
verification) in accordance with a specified cryptographic algorithm [
• RSA Digital Signature Algorithm and cryptographic key sizes (modulus)
[2048 bits, 3072 bits, 4096 bits]
• Elliptic Curve Digital Signature Algorithm and cryptographic key sizes
[256 bits, 384 bits, 521 bits]
]
that meet the following: [
• For RSA schemes: FIPS PUB 186-4, “Digital Signature Standard (DSS)”,
Section 5.5, using PKCS #1 v2.1 Signature Schemes RSASSA-PSS and/or
RSASSA-PKCS1v1_5; ISO/IEC 9796-2, Digital signature scheme 2 or
Digital Signature scheme 3
• For ECDSA schemes: FIPS PUB 186-4, “Digital Signature Standard (DSS)”,
Section 6 and Appendix D, Implementing “NIST curves” [P-256, P-384, P-
521]; ISO/IEC 14888-3, Section 6.4
].
4.2.2.6 Cryptographic Operation (Hash Algorithm) (FCS_COP.1/Hash)
FCS_COP.1.1/Hash The TSF shall perform cryptographic hashing services in accordance with a
specified cryptographic algorithm [SHA-1, SHA-256, SHA-384, SHA-512] and
message digest sizes [160, 256, 384, 512] bits that meet the following: ISO/IEC
10118-3:2004.
4.2.2.7 Cryptographic Operation (Keyed Hash Algorithm) (FCS_COP.1/KeyedHash)
FCS_COP.1.1/KeyedHash The TSF shall perform keyed-hash message authentication in accordance
with a specified cryptographic algorithm [HMAC-SHA-1, HMAC-SHA-256,
HMAC-SHA-384, HMAC-SHA-512] and cryptographic key sizes [for
HMAC-SHA-1: 256-2048 bits in 128 bit increments; for HMAC-SHA2-256:
256, 448, 512, 1536, 2048 bits; for HMAC-SHA2-384: 192, 320, 1024,
1920, 2048 bits; for HMAC-SHA2-512: 256, 448, 1024, 1536, 2048 bits]
and message digest sizes [160, 256, 384, 512] bits that meet the
following: ISO/IEC 9797-2:2011, Section 7 “MAC Algorithm 2”.
4.2.2.8 HTTPS Protocol (FCS_HTTPS_EXT.1)
FCS_HTTPS_EXT.1.1 The TSF shall implement the HTTPS protocol that complies with RFC 2818.
FCS_HTTPS_EXT.1.2 The TSF shall implement HTTPS using TLS.
FCS_HTTPS_EXT.1.3 If a peer certificate is presented, the TSF shall [not establish the connection] if
the peer certificate is deemed invalid.
Application Note: FCS_HTTPS_EXT.1.3 is only applicable in the case where the TOE supports
mutual authentication or acts as an HTTPS Client. The TOE does not support
mutual authentication and only implements HTTPS as a server. Therefore, peer
certificates are not requested and not checked by the TSF.
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4.2.2.9 NTP Protocol (FCS_NTP_EXT.1)
FCS_NTP_EXT.1.1 The TSF shall use only the following NTP version(s) [NTP v4 (RFC 5905)].
FCS_NTP_EXT.1.2 The TSF shall update its system time using [
• Authentication using [SHA1, SHA256] as the message digest
algorithm(s);
].
FCS_NTP_EXT.1.3 The TSF shall not update NTP timestamp from broadcast and/or multicast
addresses.
FCS_NTP_EXT.1.4 The TSF shall support configuration of at least three (3) NTP time sources in the
Operational Environment.
4.2.2.10 Random Bit Generation (FCS_RBG_EXT.1)
FCS_RBG_EXT.1.1 The TSF shall perform all deterministic random bit generation services in
accordance with ISO/IEC 18031:2011 using [CTR_DRBG (AES)].
FCS_RBG_EXT.1.2 The deterministic RBG shall be seeded by at least one entropy source that
accumulates entropy from [[1] platform-based noise sources] with a minimum of
[256 bits] of entropy at least equal to the greatest security strength, according to
ISO/IEC 18031:2011 Table C.1 “Security Strength Table for Hash Functions”, of the
keys and hashes that it will generate.
4.2.2.11 SSH Server Protocol (FCS_SSHS_EXT.1)
FCS_SSHS_EXT.1.1 The TSF shall implement the SSH protocol in accordance with: RFCs 4251, 4252,
4253, 4254, [4256, 4344, 5656, 6668].
FCS_SSHS_EXT.1.2 The TSF shall ensure that the SSH protocol implementation supports the following
authentication methods as described in RFC 4252: public key-based, [password-
based].
FCS_SSHS_EXT.1.3 The TSF shall ensure that, as described in RFC 4253, packets greater than [256000]
bytes in an SSH transport connection are dropped.
FCS_SSHS_EXT.1.4 The TSF shall ensure that the SSH transport implementation uses the following
encryption algorithms and rejects all other encryption algorithms: [aes128-ctr,
aes256-ctr, aes128-gcm@openssh.com, aes256-gcm@openssh.com ].
FCS_SSHS_EXT.1.5 The TSF shall ensure that the SSH public-key based authentication
implementation uses [ssh-rsa, ecdsa-sha2-nistp256] as its public key algorithm(s)
and rejects all other public key algorithms.
FCS_SSHS_EXT.1.6 The TSF shall ensure that the SSH transport implementation uses [hmac-sha2-
256, hmac-sha2-512, implicit] as its data integrity MAC algorithm(s) and rejects
all other MAC algorithm(s).
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FCS_SSHS_EXT.1.7 The TSF shall ensure that [diffie-hellman-group14-sha1, ecdh-sha2-nistp256]
and [ecdh-sha2-nistp384, ecdh-sha2-nistp521] are the only allowed key
exchange methods used for the SSH protocol.
FCS_SSHS_EXT.1.8 The TSF shall ensure that within SSH connections the same session keys are used
for a threshold of no longer than one hour, and each encryption key is used to
protect no more than one gigabyte of data. After any of the thresholds are
reached, a rekey needs to be performed.
4.2.2.12 TLS Client Protocol without Mutual Authentication (FCS_TLSC_EXT.1)
FCS_TLSC_EXT.1.1 The TSF shall implement [TLS 1.2 (RFC 5246)] and reject all other TLS and SSL
versions. The TLS implementation will support the following ciphersuites:
[
• TLS_DHE_RSA_WITH_AES_128_CBC_SHA as defined in RFC 3268
• TLS_DHE_RSA_WITH_AES_256_CBC_SHA as defined in RFC 3268
• TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA as defined in RFC 4492
• TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA as defined in RFC 4492
• TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA as defined in RFC 4492
• TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA as defined in RFC 4492
• TLS_DHE_RSA_WITH_AES_128_CBC_ SHA256 as defined in RFC 5246
• TLS_DHE_RSA_WITH_AES_256_CBC_ SHA256 as defined in RFC 5246
• TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 as defined in RFC 5288
• TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 as defined in RFC 5288
• TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 as defined in RFC
5289
• TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 as defined in RFC
5289
• TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 as defined in RFC
5289
• TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 as defined in RFC
5289
• TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 as defined in RFC 5289
• TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 as defined in RFC 5289
• TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 as defined in RFC 5289
• TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 as defined in RFC 5289
].
FCS_TLSC_EXT.1.2 The TSF shall verify that the presented identifier matches [the reference identifier
per RFC 6125 section 6].
FCS_TLSC_EXT.1.3 When establishing a trusted channel, by default the TSF shall not establish a
trusted channel if the server certificate is invalid. The TSF shall also [
• Not implement any administrator override mechanism
].
FCS_TLSC_EXT.1.4 The TSF shall [present the Supported Elliptic Curves/Supported Groups Extension
with the following curves/groups: [secp256r1, secp384r1, secp521r1] and no
other curves/groups] in the Client Hello.
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4.2.2.13 TLS Server Protocol without Mutual Authentication (FCS_TLSS_EXT.1)
FCS_TLSS_EXT.1.1 The TSF shall implement [TLS 1.2 (RFC 5246)] and reject all other TLS and SSL
versions. The TLS implementation will support the following ciphersuites:
[
• TLS_DHE_RSA_WITH_AES_128_CBC_SHA as defined in RFC 3268
• TLS_DHE_RSA_WITH_AES_256_CBC_SHA as defined in RFC 3268
• TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA as defined in RFC 4492
• TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA as defined in RFC 4492
• TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA as defined in RFC 4492
• TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA as defined in RFC 4492
• TLS_DHE_RSA_WITH_AES_128_CBC_ SHA256 as defined in RFC 5246
• TLS_DHE_RSA_WITH_AES_256_CBC_ SHA256 as defined in RFC 5246
• TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 as defined in RFC 5288
• TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 as defined in RFC 5288
• TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 as defined in RFC
5289
• TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 as defined in RFC
5289
• TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 as defined in RFC
5289
• TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 as defined in RFC
5289
• TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 as defined in RFC 5289
• TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 as defined in RFC 5289
• TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 as defined in RFC 5289
• TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 as defined in RFC 5289
].
FCS_TLSS_EXT.1.2 The TSF shall deny connections from clients requesting SSL 2.0, SSL 3.0, TLS 1.0
and [TLS 1.1].
FCS_TLSS_EXT.1.3 The TSF shall perform key establishment for TLS using [Diffie-Hellman
parameters with size [2048 bits], ECDHE curves [secp256r1, secp384r1,
secp521r1] and no other curves].
FCS_TLSS_EXT.1.4 The TSF shall support [no session resumption or session tickets].
4.2.3 Identification and Authentication (FIA)
4.2.3.1 Authentication Failure Management (FIA_AFL.1)
FIA_AFL.1.1 The TSF shall detect when an Administrator configurable positive integer within [1 and
65534] unsuccessful authentication attempts occur related to Administrators attempting
to authenticate remotely using a password.
FIA_AFL.1.2 When the defined number of unsuccessful authentication attempts has been met, the TSF
shall [prevent the offending Administrator from successfully establishing a remote
session using any authentication method that involves a password until [unlock] is
taken by an Administrator; prevent the offending Administrator from successfully
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establishing remote session using any authentication method that involves a password
until an Administrator defined time period has elapsed].
4.2.3.2 Password Management (FIA_PMG_EXT.1)
FIA_PMG_EXT.1.1 The TSF shall provide the following password management capabilities for
administrative passwords:
a) Passwords shall be able to be composed of any combination of upper and
lower case letters, numbers, and the following special characters: [“!”, “@”,
“#”, “$”, “%”, “^”, “&”, “*”, “(“, “)”, [“_”, “-“, “+”, “=”, “[“, “{“, “]”, “}”, “,”,
“<”, “>”, “.”, “/”, “?”, “~”, “`”, “ “ (i.e. space separators]];
b) Minimum password length shall be configurable to between [6] and [128]
characters.
4.2.3.3 Password-Based Authentication Mechanism (FIA_UAU_EXT.2)
FIA_UAU_EXT.2.1 The TSF shall provide a local [password-based] authentication mechanism to
perform local administrative user authentication.
4.2.3.4 Protected Authentication Feedback (FIA_UAU.7)
FIA_UAU.7.1 The TSF shall provide only obscured feedback to the administrative user while the
authentication is in progress at the local console.
4.2.3.5 User Identification and Authentication (FIA_UIA_EXT.1)
FIA_UIA_EXT.1.1 The TSF shall allow the following actions prior to requiring the non-TOE entity to
initiate the identification and authentication process:
• Display the warning banner in accordance with FTA_TAB.1;
• [no other actions].
FIA_UIA_EXT.1.2 The TSF shall require each administrative user to be successfully identified and
authenticated before allowing any other TSF-mediated actions on behalf of that
administrative user.
4.2.3.6 X.509 Certificate Validation (FIA_X509_EXT.1/Rev)
FIA_X509_EXT.1.1/Rev The TSF shall validate certificates in accordance with the following rules:
• RFC 5280 certificate validation and certificate path validation
supporting a minimum path length of three certificates.
• The certification path must terminate with a trusted CA certificate
designated as a trust anchor.
• The TSF shall validate a certification path by ensuring that all CA
certificates in the certification path contain the basicConstraints
extension with the CA flag set to TRUE.
• The TSF shall validate the revocation status of the certificate using
[the Online Certificate Status Protocol (OCSP) as specified in RFC
6960].
• The TSF shall validate the extendedKeyUsage field according to the
following rules:
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o Certificates used for trusted updates and executable code
integrity verification shall have the Code Signing purpose (id-kp 3
with OID 1.3.6.1.5.5.7.3.3) in the extendedKeyUsage field.
o Server certificates presented for TLS shall have the Server
Authentication purpose (id-kp 1 with OID 1.3.6.1.5.5.7.3.1) in the
extendedKeyUsage field.
o Client certificates presented for TLS shall have the Client
Authentication purpose (id-kp 2 with OID 1.3.6.1.5.5.7.3.2) in the
extendedKeyUsage field.
o OCSP certificates presented for OCSP responses shall have the
OCSP Signing purpose (id-kp 9 with OID 1.3.6.1.5.5.7.3.9) in the
extendedKeyUsage field.
FIA_X509_EXT.1.2/Rev The TSF shall only treat a certificate as a CA certificate if the basicConstraints
extension is present and the CA flag is set to TRUE.
4.2.3.7 X.509 Certificate Authentication (FIA_X509_EXT.2)
FIA_X509_EXT.2.1 The TSF shall use X.509v3 certificates as defined by RFC 5280 to support
authentication for [HTTPS, TLS], and [no additional uses].
FIA_X509_EXT.2.2 When the TSF cannot establish a connection to determine the validity of a
certificate, the TSF shall [not accept the certificate].
4.2.3.8 X.509 Certificate Requests (FIA_X509_EXT.3)
FIA_X509_EXT.3.1 The TSF shall generate a Certificate Request as specified by RFC 2986 and be able
to provide the following information in the request: public key and [Common
Name, Organization, Organizational Unit, Country].
FIA_X509_EXT.3.2 The TSF shall validate the chain of certificates from the Root CA upon receiving
the CA Certificate Response.
4.2.4 Security Management (FMT)
4.2.4.1 Management of Security Functions Behavior (FMT_MOF.1/ManualUpdate)
FMT_MOF.1.1/ManualUpdate The TSF shall restrict the ability to enable the functions to perform
manual updates to Security Administrators.
4.2.4.2 Management of TSF Data (FMT_MTD.1/CoreData)
FMT_MTD.1.1/CoreData The TSF shall restrict the ability to manage the TSF data to Security
Administrators.
4.2.4.3 Management of TSF Data (FMT_MTD.1/CryptoKeys)
FMT_MTD.1.1/CryptoKeys The TSF shall restrict the ability to manage the cryptographic keys to
Security Administrators.
4.2.4.4 Specification of Management Functions (FMT_SMF.1)
FMT_SMF.1.1 The TSF shall be capable of performing the following management functions:
• Ability to administer the TOE locally and remotely;
• Ability to configure the access banner;
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• Ability to configure the session inactivity time before session termination or
locking;
• Ability to update the TOE, and to verify the updates using [digital signature]
capability prior to installing those updates;
• Ability to configure the authentication failure parameters for FIA_AFL.1;
• [
o Ability to manage the cryptographic keys;
o Ability to re-enable an Administrator account;
o Ability to set the time which is used for time-stamps;
o Ability to configure NTP;
o Ability to manage the TOE’s trust store and designate X509.v3 certificates
as trust anchors;
o Ability to import X.509v3 certificates to the TOE's trust store;
].
4.2.4.5 Restrictions on Security Roles (FMT_SMR.2)
FMT_SMR.2.1 The TSF shall maintain the roles:
• Security Administrator.
FMT_SMR.2.2 The TSF shall be able to associate users with roles.
FMT_SMR.2.3 The TSF shall ensure that the conditions
• The Security Administrator role shall be able to administer the TOE locally
• The Security Administrator role shall be able to administer the TOE remotely
are satisfied.
4.2.5 Protection of the TSF (FPT)
4.2.5.1 Protection of Administrator Passwords (FPT_APW_EXT.1)
FPT_APW_EXT.1.1 The TSF shall store administrative passwords in non-plaintext form.
FPT_APW_EXT.1.2 The TSF shall prevent the reading of plaintext administrative passwords.
4.2.5.2 Protection of TSF Data (for reading of all pre-shared keys, symmetric keys, and private keys)
(FPT_SKP_EXT.1)
FPT_SKP_EXT.1.1 The TSF shall prevent reading of all pre-shared keys, symmetric keys, and private keys.
4.2.5.3 Reliable Time Stamps (FPT_STM_EXT.1)
FPT_STM_EXT.1.1 The TSF shall be able to provide reliable time stamps for its own use.
FPT_STM_EXT.1.2 The TSF shall [allow the Security Administrator to set the time, synchronise time with
an NTP server].
4.2.5.4 TSF Testing (FPT_TST_EXT.1)
FPT_TST_EXT.1.1 The TSF shall run a suite of the following self-tests [during initial start-up (on power
on)] to demonstrate the correct operation of the TSF: [cryptographic algorithm
Known Answer Tests (KATs), firmware/software integrity test].
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4.2.5.5 Trusted Update (FPT_TUD_EXT.1)
FPT_TUD_EXT.1.1 The TSF shall provide Security Administrators the ability to query the currently
executing version of the TOE firmware/software and [no other TOE
firmware/software version].
FPT_TUD_EXT.1.2 The TSF shall provide Security Administrators the ability to manually initiate updates
to TOE firmware/software and [no other update mechanism].
FPT_TUD_EXT.1.3 The TSF shall provide means to authenticate firmware/software updates to the TOE
using a [digital signature] prior to installing those updates.
4.2.6 TOE Access (FTA)
4.2.6.1 TSF-Initiated Session Locking (FTA_SSL_EXT.1)
FTA_SSL_EXT.1.1 The TSF shall, for local interactive sessions, [terminate the session] after a Security
Administrator-specified time period of inactivity.
4.2.6.2 TSF-Initiated Termination (FTA_SSL.3)
FTA_SSL.3.1 The TSF shall terminate a remote interactive session after a Security Administrator-
configurable time interval of session inactivity.
4.2.6.3 User-Initiated Termination (FTA_SSL.4)
FTA_SSL.4.1 The TSF shall allow Administrator-initiated termination of the Administrator’s own
interactive session.
4.2.6.4 Default TOE Access Banners (FTA_TAB.1)
FTA_TAB.1.1 Before establishing an administrative user session the TSF shall display a Security
Administrator-specified advisory notice and consent warning message regarding use of
the TOE.
4.2.7 Trusted Path/Channels (FTP)
4.2.7.1 Inter-TSF Trusted Channel (FTP_ITC.1)
FTP_ITC.1.1 The TSF shall be capable of using [TLS] to provide a trusted communication channel
between itself and authorized IT entities supporting the following capabilities: audit
server, [no other capabilities] that is logically distinct from other communication
channels and provides assured identification of its end points and protection of the
channel data from disclosure and detection of modification of the channel data.
FTP_ITC.1.2 The TSF shall permit the TSF or the authorized IT entities to initiate communication via
the trusted channel.
FTP_ITC.1.3 The TSF shall initiate communication via the trusted channel for [export of audit records
to external syslog server].
4.2.7.2 Trusted Path (FTP_TRP.1/Admin)
FTP_TRP.1.1/Admin The TSF shall be capable of using [SSH, HTTPS] to provide a communication path
between itself and authorized remote Administrators that is logically distinct
from other communication paths and provides assured identification of its end
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points and protection of the communicated data from disclosure and provides
detection of modification of the channel data.
FTP_TRP.1.2/Admin The TSF shall permit remote Administrators to initiate communication via the
trusted path.
FTP_TRP.1.3/Admin The TSF shall require the use of the trusted path for initial Administrator
authentication and all remote administration actions.
4.3 TOE Security Assurance Requirements
The security assurance requirements for the TOE are included by reference from the [cPPND].
Table 7: Assurance Components
Requirement Class Requirement Component
ADV: Development ADV_FSP.1 Basic functional specification
AGD: Guidance documents AGD_OPE.1 Operational user guidance
AGD_PRE.1 Preparative procedures
ALC: Life-cycle support ALC_CMC.1 Labelling of the TOE
ALC_CMS.1 TOE CM coverage
ATE: Tests ATE_IND.1 Independent testing – conformance
AVA: Vulnerability assessment AVA_VAN.1 Vulnerability survey
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5 TOE Summary Specification
This section describes the following security functions implemented by the TOE to satisfy the SFRs claimed
in Section 4.2:
• Security Audit
• Cryptographic Support
• Identification and Authentication
• Security Management
• Protection of the TSF
• TOE Access
• Trusted Path/Channels.
5.1 Security Audit
5.1.1 Audit Data Generation
The TOE generates audit records for: start-up and shut-down of the audit functions; and the
administrative actions:
• Administrative login and logout.
• Changes to TSF data related to configuration changes (in addition to the information that a
change occurred, the TOE logs what has been changed).
• Generating/import of, changing, or deleting of cryptographic keys (in addition to the action
itself a unique key name or key reference is logged).
• Resetting passwords (name of related user account is logged).
Additionally, the TOE logs the specifically defined auditable events listed in Table 6.
The TOE records the following information within each audit record: date and time of the event, type of
event, subject identity, the outcome (success or failure) of the event; and for each audit event type, based
on the auditable event definitions of the functional components included in the cPP/ST, information
specified in column three of Table 6.
All auditable events that involve configuration of the TSF include the action requested, the success or
failure, and the identity of the user that made the request. This includes any cryptographic operations,
specifically requesting to generate a CSR, import of a certificate, management of certificate stores, and
manage the list of certificates used to validate servers. All actions by administrators that involve keys are
performed in association with certificates. When auditing certificate operations, the TOE records the
Issuer and serial number field of a certificate in order to uniquely identify the certificate.
This aspect of the Security Audit security function satisfies FAU_GEN.1 and FAU_GEN.2.
5.1.2 Audit Storage and Audit Record Export
The TOE is a single standalone appliance that stores audit logs locally in the logs file (/data/Audit) and
provides the administrator the ability to configure the real-time export of syslog records protected with
TLS. To enable sending to a remote Syslog server, use the REMOTESYSLOG command.
The audit service rotates to a new file when the current file exceeds 5K in size. The audit log service
maintains only the most recent 20 files, so local audit log space is capped at 100K.
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The TOE does not provide any interfaces to modify or manually delete the stored audit logs and can only
be viewed by a Security Administrator.
This aspect of the Security Audit security function satisfies FAU_STG.1 and FAU_STG_EXT.1.
5.2 Cryptographic Support
The TOE includes the Crestron Crypto Kernel for Open SSL libraries with openssl 1.0.2x-fips that has
obtained CAVP certificates for their cryptographic algorithms. Table 8 below summarizes the CAVP
certificates. The TOE uses this library: in support of its NTP implementation; for verifying TOE update
package signatures; and for all SSH, TLS and certificate functionality.
Table 8: Cryptographic Functions Implemented by OpenSSL
Functions Standards Certificates
Asymmetric Key Generation (FCS_CKM.1)
RSA (2048 bits, 3072 bits, 4096 bits) FIPS PUB 186-4, “Digital Signature Standard
(DSS)”, Appendix B.3
RSA #A1221
ECDSA (P-256, P-384, P-521 curves) FIPS PUB 186-4, “Digital Signature Standard
(DSS)”, Appendix B.4
ECDSA #A1222
DSA (2048 bits) FIPS PUB 186-4, “Digital Signature Standard
(DSS)”, Appendix B.1
DSA #A1222
FFC Schemes using ‘safe-prime’ groups
and RFC 3526
“NIST Special Publication 800-56A Revision 3 N/A
Key establishment (FCS_CKM.2)
Elliptic curve-based scheme NIST Special Publication 800-56A Revision 2,
“Recommendation for Pair-Wise Key
Establishment Schemes Using Discrete Logarithm
Cryptography”
KAS-ECC
#A1223
Finite field-based scheme NIST Special Publication 800-56A Revision 2,
“Recommendation for Pair-Wise Key
Establishment Schemes Using Discrete Logarithm
Cryptography”
KAS-FFC
#A1223
FFC Schemes using “safe-prime” groups NIST Special Publication 800-56A Revision 3 and
RFC 3526 groups
N/A
Data encryption (FCS_COP.1/DataEncryption)
AES in CBC mode (128, 256 bits)
AES in GCM mode (128, 256 bits)
AES in CTR mode (128, 256 bits)
ISO 18033-3 (AES)
ISO 10116 (CBC mode)
ISO 10116 (CTR mode)
ISO 19772 (GCM mode)
AES #A1222
Digital signature generation and verification (FCS_COP.1/SigGen)
RSA Digital Signature Algorithm (2048 bit,
3072 bit, and 4096 bit modulus)
FIPS PUB 186-4, “Digital Signature Standard
(DSS)”, Section 5.5, using PKCS #1 v2.1 Signature
Schemes RSASSA-PSS and/or RSASSAPKCS1v1_5;
ISO/IEC 9796-2, Digital signature scheme 2 or
Digital Signature scheme 3
RSA #A1222
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Functions Standards Certificates
ECDSA Elliptic Curve Digital Signature
Algorithm (P-256, P-384, P-521 curves)
FIPS PUB 186-4, “Digital Signature Standard
(DSS)”, Section 6 and Appendix D, Implementing
“NIST curves” [P-256, P-384, P-521]; ISO/IEC
14888-3, Section 6.4
ECDSA #A1222
Cryptographic hashing (FCS_COP.1/Hash)
SHA-1 (digest size 160 bits)
SHA-256 (digest size 256 bits)
SHA-384 (digest size 384 bits)
SHA-512 (digest size 512 bits)
ISO/IEC 10118-3:2004 SHS #A1222
Keyed-hash message authentication (FCS_COP.1/KeyedHash)
HMAC-SHA-1 (key sizes: 256-2048 bits in
128 bit increments, digest size 160 bits)
HMAC-SHA-256 (key sizes: 256, 448, 512,
1536, 2048 bits, digest size 256 bits)
HMAC-SHA-384 (key sizes: 192, 320, 1024,
1920, 2048 bits, digest size 384 bits)
HMAC-SHA-512 (key sizes: 256, 448, 1024,
1536, 2048 bits, digest size 512 bits)
ISO/IEC 9797-2:2011, Section 7 “MAC Algorithm
2”
HMAC #A1222
Deterministic random bit generation (FCS_RBG_EXT.1)
AES-256 CTR_DRBG ISO/IEC 18031:2011 DRBG #A1222
5.2.1 Cryptographic Operations
The TOE uses most cryptographic algorithms in support of TLS and SSH. For example, the TOE uses SHA
hashing during digital signature calculation (hashing of the message); for integrity as part of HMAC-SHA
operations within TLS; and also for authentication of NTP servers. The TOE implements AES-CBC and GCM
(both 128 and 256-bit) depending upon the TLS cipher suite; and AES-CTR (both 128 and 256-bit) for SSH.
The TOE will generate ephemeral 2048-bit Diffie-Hellman (i.e., finite field) parameters or ECDSA P-256/P-
384/P-521 ephemeral elliptic curve parameters for key establishment in TLS/SSH. The TOE will use
2048/3072/4096 RSA or ECDSA (P-256/P-384/P-521) signature generation and verification operations as
part of server authentication, depending on whether the negotiated cipher suite specifies the use of an
RSA-based or ECDSA-based X.509 certificate. Additionally, RSA 2048 bit signatures are used when verifying
TOE update packages.
The TOE performs SHA-1/256/384/512 cryptographic hashing with message digest sizes 160, 256, 384,
512, in bits that meets ISO/IEC 10118-3:2004. The TOE performs HMAC-SHA-1, HMAC-SHA-256, HMAC-
SHA-384, or HMAC-SHA-512 (depending on negotiated cipher suite) for integrity of TLS protected data
using SHA-1/256/384/512 with key sizes 192-2048 bits to produce a 160/256/384/512 output MAC. The
HMAC-SHA-1 and HMAC-SHA-256 algorithms have a block size of 512 bits, while the HMAC-SHA-384 and
HMAC-SHA-512 algorithms have a block size of 1024 bits. The keyed-hash message authentication
cryptographic algorithms have the following cryptographic key sizes: for HMAC-SHA-1: 256-2048 bits in
128 bit increments; for HMAC-SHA2-256: 256, 448, 512, 1536, 2048 bits; for HMAC-SHA2-384: 192, 320,
1024, 1920, 2048 bits; and for HMAC-SHA2-512: 256, 448, 1024, 1536, 2048 bits.
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This aspect of the Cryptographic Support security function satisfies FCS_COP.1/DataEncryption,
FCS_COP.1/SigGen, FCS_COP.1/Hash, and FCS_COP.1/KeyedHash.
5.2.2 Random Bit Generation
The TOE uses an AES-256 CTR_DRBG from OpenSSL library. The maximum security strength supported by
the DRBG is the security strength of the block cipher (256 bits). The TOE instantiates the DRBG with the
maximum security strength, obtaining the 256 bit seed (along with a 128 bit nonce) by calling
/dev/random for 384 bits. The TOE accumulates entropy into /dev/random using the jitterentropy-rngd
package (version 1.2.3), which collects entropy from CPU execution time jitter. The TOE assumes the
output from the jitterentropy-rngd package provides 8 bits of entropy per byte (i.e., full entropy) when
mixed into the entropy pool that feeds /dev/random. Since calls to /dev/random block until sufficient
entropy is accumulated to satisfy the number of bits requested, the TOE will seed the CTR_DRBG with 256
bits of entropy.
The TOE uses this DRBG to generate all keys (as part of SSH, TLS and CSR key generation) as well as to
generate salts and nonces (for password hashing and TLS respectively).
This aspect of the Cryptographic Support security function satisfies FCS_RBG_EXT.1.
5.2.3 Cryptographic Key Generation and Establishment
The TOE supports generating key pairs, both for authentication and for key exchange for SSH and TLS.
When generating authentication key pairs, the TOE can generate a CSR with RSA 2048, 3072 and 4096 bit
key pairs; and ECDSA P-256, P-384, P-521 key pairs.
For key establishment, the TOE will generate 2048-bit DHE keys or P-256/P-384/P-521 ECDHE keys
(depending on the negotiated cipher suite) during TLS negotiation.
The TOE performs key establishment for TLS, and SSH. The TOE acts as both a TLS server to service
incoming administrative sessions and as a TLS client for syslog export. The TOE supports elliptic curve, and
finite field-based key establishment for TLS, depending on the negotiated cipher suite. The TOE’s SSH
implementation, used for administrative sessions, uses only diffie-hellman-group14-sha1 (finite field-
based using “safe-prime” groups key establishment), ecdh-sha2-nistp256, ecdh-sha2-nistp384, and ecdh-
sha2-nistp521 for its key exchange methods.
This aspect of the Cryptographic Support security function satisfies FCS_CKM.1 and FCS_CKM.2.
5.2.4 Cryptographic Key Destruction
The TOE clears keys from volatile memory by overwriting the memory locations in RAM with zeroes. The
TOE clears plaintext keys in non-volatile storage by performing a single overwrite consisting of a new value
of the key. Keys stored in flash are AES-256-CBC encrypted.
Table 9: Key Clearing
Key Storage
Location
How Stored Usage and destruction
SSH Host
Private Key
Flash plaintext
Root access only
Used by SSH for client authentication of
the SSH server, which is the TOE. It is
replaced with a new key at request of the
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administrator using the command:
SSHSERVER GENHOSTKEY.
SSH Session
Key
RAM plaintext Used by SSH to encrypt a session and is
destroyed when the SSH session is
closed.
TLS Session
Key
RAM plaintext Used by TLS to encrypt a session and is
destroyed when the TLS session is closed.
Diffie-Hellman
Shared Secret
RAM plaintext Used by the SSH and TLS protocols and is
destroyed at the completion of the DH
exchange step of those protocols
Web Server
Certificate
Private Key
Flash &
RAM
Encrypted, AES-256-CBC Used for web server. Uploaded by user,
can be deleted or replaced by user.
The TOE incorporates OpenSSL, which provides implementation of the cryptographic algorithms specified
in Table 8. The TOE invokes the OpenSSL cryptomodule APIs to set up and maintain the full TLS session,
using the underlying cryptographic algorithms as identified in Table 8. Therefore, all key generation,
negotiation of session keys, and packet authentication is performed by the OpenSSL cryptomodule. Files
such as private keys and certificates are manually uploaded to the TOE during initial setup. Changes can
be performed by remote access (SSH or GUI) or locally on the appliance with physical access to a network
port. The SSH Host Private Key is stored in a file in a filesystem that is located in Flash. When an
administrator requests a new key, the command (SSHSERVER GENHOSTKEY) invokes lower-level file
system APIs to open and write to the file.
The plaintext private keys and CSPs (see Table 9 above) are managed by the cryptomodule and stored in
RAM or Flash. Encrypted flash keys are copied unencrypted to a RAM drive at startup for runtime use. The
cryptomodule does not store any other secret or private keys or CSPs persistently (beyond the lifetime of
an API call). All secret keys, plaintext private keys and CSPs are destroyed automatically by the API when
no longer required by overwriting once with zeroes or with a new value of the key (for SSH private keys).
The Web Server certificate private keys are stored in a PKCS#12 file (in flash) with a randomly generated
password. That password is stored in the configuration file located in the /etc directory encrypted with a
password that is embedded in the firmware source code. The key and the password are stored encrypted
using AES-256-CBC.
All keys, key material, and authentication credentials are protected from unauthorized disclosure. There
are no configurations or circumstances that do not conform to the key destruction requirement.
This aspect of the Cryptographic Support security function satisfies FCS_CKM.4.
5.2.5 Cryptographic Protocols
The TOE implements the following cryptographic protocols to protect communications between itself and
non-TOE entities:
• TLS as a client—the TOE acts as a TLS client when exporting audit records to an external audit
server.
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• TLS as a server—the TOE acts as a TLS server supporting inbound administrative sessions.
Mutual authentication is not supported for TLS.
• SSH—the TOE acts as an SSH server supporting inbound administrative sessions.
• NTP—the TOE can synchronize its system clock with an NTP server.
5.2.5.1 SSH Server Protocol
The TOE’s SSH server implements the SSH protocol in accordance with RFCs 4251, 4252, 4253, 4254,
4256, 4344, 5656, 6668. No optional characteristics are supported. The TOE supports SSH public key-
based and password-based authentication methods as described in RFC 4252 and as described in RFC
4253, packets greater than 256 kilobytes in an SSH transport connection are dropped.
For its SSH transport implementation the TOE uses the following encryption algorithms and rejects all
other encryption algorithms: aes128-ctr, aes256-ctr, aes128-gcm@openssh.com, and aes256-
gcm@openssh.com.
The SSH public-key based authentication implementation uses ssh-rsa, and ecdsa-sha2-nistp256 as its
public key algorithms and rejects all other public key algorithms.
The SSH transport implementation uses only hmac-sha2-256, hmac-sha2-512, and implicit GCM as its data
integrity MAC algorithms and rejects all other MAC algorithms. Specifically, the TOE uses implicit GCM
MACs for aes256-gcm@openssh.com and aes128-gcm@openssh.com.
The TOE’s SSH implementation uses only diffie-hellman-group14-sha1, ecdh-sha2-nistp256, ecdh-sha2-
nistp384, and ecdh-sha2-nistp521 for its key exchange methods.
Within SSH connections the same session keys are used for a threshold of no longer than one hour, and
each encryption key is used to protect no more than one gigabyte of data. After any of the thresholds
are reached, the TOE performs a rekey.
This aspect of the Cryptographic Support security function satisfies FCS_SSHS_EXT.1
5.2.5.2 TLS Client Protocol
The TOE’s TLS client supports TLS 1.2 with the following TLS ciphersuites:
• TLS_DHE_RSA_WITH_AES_128_CBC_SHA as defined in RFC 3268
• TLS_DHE_RSA_WITH_AES_256_CBC_SHA as defined in RFC 3268
• TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA as defined in RFC 4492
• TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA as defined in RFC 4492
• TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA as defined in RFC 4492
• TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA as defined in RFC 4492
• TLS_DHE_RSA_WITH_AES_128_CBC_ SHA256 as defined in RFC 5246
• TLS_DHE_RSA_WITH_AES_256_CBC_ SHA256 as defined in RFC 5246
• TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 as defined in RFC 5288
• TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 as defined in RFC 5288
• TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 as defined in RFC 5289
• TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 as defined in RFC 5289
• TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 as defined in RFC 5289
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• TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 as defined in RFC 5289
• TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 as defined in RFC 5289
• TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 as defined in RFC 5289
• TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 as defined in RFC 5289
• TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 as defined in RFC 5289
The TOE allows the TLS client (used for audit export) to specify the syslog server by hostname (which uses
the internal hosts file for resolution). Certificate validation is done for validity (e.g. cryptographically valid,
not expired, not revoked). The TOE’s TLS client implementation establishes its reference identifiers from
the administrator-configured reference identifiers per Section 6 of RFC 6125, using the hostname as a
reference identifier and checking that the syslog server’s certificate includes the specified identifier. The
FQDN in the CN of the certificate is validated against the expected value per RFC 6125 section 6, and the
certificate is rejected if the reference identifier is invalid. The TLS client supports the Elliptic Curves
Extension (specifying only P-256, P-384, and P-521) in its Client Hello, and the TOE does not require (nor
allow) administrative configuration of this extension; the TOE always sends it. Wildcards are supported.
The TOE’s TLS client does not support mutual authentication or IP addresses.
This aspect of the Cryptographic Support security function satisfies FCS_TLSC_EXT.1.
5.2.5.3 TLS Server Protocol
The TOE’s TLS server supports TLS 1.2 with the same TLS ciphersuites as identified above for the TOE’s TLS
Client.
The TOE denies versions of TLS older than TLS 1.2 and does not support session resumption or session
tickets. The TOE uses 2048-bit DHE, or an elliptic curve during TLS key exchange using any of P-256, P-384,
or P-521. The TLS Server doesn’t do certificate validation. It sends its certificate to the external TLS client
so that the TLS client can validate the TLS server’s certificate.
The TOE implements TLS server functionality for inbound management requests over HTTPS. The TOE’s
HTTPS implementation conforms to RFC 2818.
The TOE does not support mutual authentication for any of its HTTPS/TLS connections.
This aspect of the Cryptographic Support security function satisfies FCS_HTTPS_EXT.1, and
FCS_TLSS_EXT.1.
5.2.5.4 NTP Protocol
The TOE can synchronize its system clock with up to 3 NTP servers. The TOE supports NTP v4 as defined
in RFC 5905 and can use SHA-1 or SHA-256 as its means for authenticating the NTP timestamps it receives
from configured NTP servers. The TOE will not update NTP timestamps from broadcast or multicast
addresses.
This aspect of the Cryptographic Support security function satisfies FCS_NTP_EXT.1.
5.3 Identification and Authentication
5.3.1 User Identification and Authentication
During initial configuration, the TOE’s default admin password must be changed to conform to the
password policy requirements. The default admin can define additional users. Username/password
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credentials (or key for SSH) are necessary to log in and access the management functions. Passwords or
keys can be used for SSH connections (local via direct connection to a network port, or remote). The
remote GUI access only allows password-based connection.
When a password is used, the TOE first checks the validity of the authentication against the accounts
defined locally within the TOE. If an account with the asserted identity is not found, the user login is
rejected. For a successful login, the identity and password must match those defined in the local account.
A key presented for SSH login must match that for the defined account in the TOE’s database. If the
asserted identity and password or key cannot be verified then the login fails and an audit record is
generated.
The TOE does not allow any security-relevant actions prior to requiring the identification and
authentication process except the display of the warning banner. For the GUI the user must acknowledge
the banner by clicking on an ‘ok’ button. The TOE provides no feedback to the administrator during
authentication other than the success or failure of their attempt. For local password-based credentials,
the TOE accepts passwords that consist of any combination of uppercase letters, lowercase letters,
numbers, and special characters. The TOE supports characters defined by the following regular
expression: ^[\p{L}\p{N}\p{Zs}\p{S}\p{P}]*$. This includes all letters, numbers, symbols, punctuation, and
space separators. The SETPASSWORDRULE command is used to change the minimum password length
to values between 6 and 128 characters (default is 8 characters).
This aspect of the Identification and Authentication security function satisfies FIA_UIA_EXT.1,
FIA_UAU_EXT.2, FIA_UAU.7, and FIA_PMG_EXT.1.
5.3.2 Authentication Failure Management
For password-based authentication, the administrator can configure the number of incorrect remote
authentication attempts enforced on user accounts to a value between 1 and 65534 (with the default
being 5). If an authentication attempt exceeds that threshold, the TOE will enforce an administrator-
configurable (between 1 and 255 hours) lockout of the remote administrator. The admin can also unlock
a user with the REMLOCKEDUSER command. The SETUSERLOGINATTEMPTS and
SETUSERLOCKOUTTIME commands are used to configure the thresholds.
Authentication failure handling is only enforced on password credentials. User authentication based on
SSH private key is not subject to the lockout mechanism. To ensure there is never a case where all
administrators are locked out due to the session locking mechanism, at least one admin account must be
set up to use SSH public key authentication.
This aspect of the Identification and Authentication security function satisfies FIA_AFL.1.
5.3.3 X.509 Certificate Validation
The TOE performs revocation checking of certificates during TLS client connection establishment (i.e.,
when the TOE acts as a TLS client connecting to a remote syslog-tls server) using the Online Certificate
Status Protocol (OCSP) as specified in RFC 6960. OCSP certificates presented for OCSP responses have the
OCSP Signing purpose (id-kp 9 with OID 1.3.6.1.5.5.7.3.9) in the extendedKeyUsage field.
The TOE performs the revocation checking after having checked the validity of the server certificate and
its chain, conformant to RFC 5280. This includes supporting a minimum path length of three certificates
and the certification path terminating with a trusted CA certificate designated as a trust anchor. The TOE
requires that TLS server certificates have the Server Authentication purpose and that TLS client certificates
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have the Client Authentication purpose in order to be considered valid. The TOE will not treat a CA
certificate as such unless the basicConstraints extension is present with the CA flag set to TRUE.
The TOE does not use certificates for trusted updates or executable code integrity verification and
therefore the Code Signing purpose (id-kp 3 with OID 1.3.6.1.5.5.7.3.3) is not used in the
extendedKeyUsage field.
This aspect of the Identification and Authentication security function satisfies FIA_X509_EXT.1/Rev.
5.3.4 X.509 Certificate Authentication
The TOE uses X.509 certificates for authentication of TLS and HTTPS trusted channels. The TOE relies upon
the administrator to load the CA certificates (root CA and any needed intermediate certificates).
When receiving a connection from a remote administrator, the TSF will present its own server certificate
to the client. Mutual authentication is not supported and there are no administrative over-rides.
During revocation checking, if the TOEs TLS client cannot establish a connection to determine revocation
status, the connection will not be established.
This aspect of the Identification and Authentication security function satisfies FIA_X509_EXT.2.
5.3.5 X.509 Certificate Requests
The TOE allows an administrator to request the TOE perform on-board key generation of an RSA key pair
and then outputs a Certificate Signing Request (CSR), which the administrator can have signed by a
suitable CA.
This aspect of the Identification and Authentication security function satisfies FIA_X509_EXT.3.
5.4 Security Management
5.4.1 Security Roles and Specification of Management Functions
The TOE provides a number of roles for local and remote management of the TOE, of which only the
‘Administrator’ role corresponds to the Security Administrator as defined in the PP. The unprivileged roles
are:
• Programmer– unprivileged. Users with this role do not have privileges to manage the TOE.
• Operator– unprivileged. Allows the user to reboot and monitor the appliance only. Users with this
role do not have privileges to manage the TOE.
• User– unprivileged. Users with this role do not have privileges to manage the TOE.
• Connect– unprivileged. Users with this role do not have privileges to manage the TOE.
The TOE provides the Security Administrator administrative access through its HTTPS server and via a CLI.
The CLI can be accessed remotely over SSH or locally by directly connecting a user laptop to a network
port and using SSH. The web-based interface is accessed remotely from a web browser. The TOE provides
the following management functions:
• Configure the access banner – CLI only
• Configure the session inactivity time before session termination – CLI only
• Update the TOE and verify TOE updates prior to installation using digital signature verification
(CLI, Web UI)
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• Configure the authentication failure parameters – CLI only
• Manage cryptographic keys: CSRs and TLS private key for web server(CLI only)
• Ability to re-enable an Administrator account (CLI only);
• Set the time used for time stamps – CLI, Web UI
• Configure NTP – CLI, Web UI
• Manage the TOE’s trust store and designate X509 v3 certificates as trust anchors – CLI only
• Import X.509 v3 certificates to the TOE's trust store (web server) – CLI only.
This aspect of the Security Management security function satisfies FMT_SMR.2 and FMT_SMF.1.
5.4.2 Management of Security Functions Behavior
The ability to perform TOE updates is restricted to the single administrative role of Security Administrator
using role-based access control.
This aspect of the Security Management security function satisfies FMT_MOF.1/ManualUpdate.
5.4.3 Management of TSF Data
The TOE does not provide any access to management functions prior to authentication and restricts the
ability to manage cryptographic keys to Security Administrators using role-based access control methods.
Specifically, the Security Administrator may use the TOE to generate CSRs (which contain key pairs) and
load certificates (whether it is certificate for the TOE generated by an external CA or a certificate used to
validate a presented TLS client or server certificate) into the TOE’s Trust Store. Certificate management
commands available to authorized administrators from the console are:
Table 10: Console Certificate Management Commands
Command Description
CREATECSR Generates a Certificate Signing Request that can
be downloaded from the device.
CERTIFICATE Manage device certificate stores.
SSLVERIFY Enable/disable certificate validation options.
A certificate signing request generates an internal server key (for the web management interface) and
Certificate signing request file. This will create a request.csr file in the “/SYS” folder of the NVX device.
This aspect of the Security Management security function satisfies FMT_MTD.1/CoreData and
FMT_MTD.1/CryptoKeys.
5.5 Protection of the TSF
5.5.1 Protection of Administrator Passwords
The TOE stores administrative password data in a salted SHA-512 hash within an internal configuration
file. The TOE does not provide interfaces for an administrator to view, extract, or read the password. The
TOE only accepts passwords during authentication attempts (or during administrative changing of the
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password), salts and hashes the provided password (and then either compares it to the stored value or
stores the new value depending upon whether the administrator is authenticating or changing the
administrative password).
This aspect of the TSF Protection security function satisfies FPT_APW_EXT.1.
5.5.2 Protection of TSF Data (for reading of all pre-shared, symmetric and private keys)
The TOE stores its Web Server Certificate private key internally in flash memory encrypted using AES-256-
CBC and does not provide any commands to access them. The TOE stores SSH private host key in plaintext
in flash and does not provide any interfaces to view the key. The private keys are used for the HTTPS and
SSH management connections.
This aspect of the TSF Protection security function satisfies FPT_SKP_EXT.1.
5.5.3 TSF Testing
The TOE performs a series of power-up Known Answer Tests (a KAT for each library cryptographic
algorithm that the TOE utilizes) as well as an integrity test during power-up. In particular, the TOE
executes the following KATs: AES, RSA, ECDSA, DH, ECDH, DRBG, HMAC, and SHA. The self-test for
verification of the integrity of the TOE firmware and software uses RSA 2048-bit signature and SHA-256
hash algorithm. For each self-test, the TOE uses known inputs to calculate an expected cryptographic
result, and compares that result to the known result. If the calculated result matches the expected result,
the test passes; if it does not match, the test fails. A failure of a power-up self-test causes the TOE to halt
its boot and reboot.
The self-tests are sufficient to demonstrate that the TSF is operating correctly since they encompass the
cryptographic functionality and the integrity of the entire TOE firmware executable code.
This aspect of the TSF Protection security function satisfies FPT_TST_EXT.1.
5.5.4 Trusted Update
The TOE provides an administrator the ability to view the currently executing version of firmware (for
example, on the STATUS tab in the navigation bar of the web-based user interface, one can see the model
name, serial number, and firmware version).
The TOE supports manual trusted updates for its firmware. Crestron digitally signs its firmware files using
RSA 2048 bit and SHA-256.
The administrator can manually initiate updates to the TOE firmware through the GUI Upload
Firmware File radio button. To initiate the firmware upgrade, the administrator must first obtain
the firmware file by loading it onto the device and clicking OK. Specifically, the firmware file is available
by entering: https://www.crestron.com/Support/Resource-Library into a web browser and entering “NVX”
into the search box and then finding the TOE firmware version in the list. The administrator must enter
their customer information and credentials to download the file. Download the file to the /firmware
location on the device. The TOE automatically verifies the digital signature on the update files during the
download process and only installs the updates if the signatures verify. From the web interface, it is not
possible to download an update and then install it at a later date.
Updates can also be manually initiated from the CLI. The update files must first be obtained by the
administrator from Crestron’s website as specified above but over SFTP. It is possible to upload a file and
then install it at a later time. The file should be copied to the /firmware location on the device. The file
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is not active until it is installed by the administrator. There are no specific commands for viewing the
version of downloaded but uninstalled firmware, however the version of the firmware is identified in the
filename and can be queried by navigating to the firmware directory and examining the filename. Once
installed, it is immediately activated. When the firmware update files are uploaded over SFTP, the files
are verified at installation, not when the file is uploaded. If the digital signatures cannot be verified then
the TOE will not perform the update and the failure will be audited.
In the evaluated configuration, the TOE does not provide an automated update mechanism.
When an upgrade fails the device remains in the current version and this can be verified by running the
‘ver –v’ command. All failures are recorded in the syslog.
This aspect of the TSF Protection security function satisfies FPT_TUD_EXT.1.
5.5.5 Reliable Time Stamps
The TOE utilizes time when creating audit records and when checking syslog server and administrative
client certificates (for expiration and revocation), for session inactivity timeout, and for administrator lock
out periods. The TOE obtains and maintains time by allowing the administrator to both manually specify
the time as well as configure up to 3 NTP servers with which the TOE synchronizes its clock. The TOE also
has a battery-backed real-time clock that is used to guarantee the availability of time data.
This aspect of the TSF Protection security function satisfies FPT_STM_EXT.1.
5.6 TOE Access
5.6.1 Access Banner
The TOE provides the administrator the ability to set a banner that the TOE displays before each local and
remote administrator login. Administrators login to the TOE remotely through the TOE’s SSH or TLS-
protected management ports, or locally via direct connection to a network port and using SSH. The single
configured banner is displayed at all interfaces and can be configured by using an SFTP client to copy a file
containing the text the administrator wishes to display onto the device into the
/SSHBanner/banner.txt file.
This aspect of the TOE Access security function satisfies FTA_TAB.1.
5.6.2 Session Termination
The TOE terminates inactive sessions when the administrator configurable inactive timeout value is
reached. The TOE provides two mechanisms, one for the CLI, which can be accessed using SSH, either
remotely or locally by directly connecting a laptop to a network port, and a second for the Web UI, which
is accessible only remotely via HTTPS. Session timeout for the CLI is configured with SETLOGOFFIDLETIME
command. The default is 20 minutes and can be configured to values between 1 and 60 minutes. ‘0’
disables the inactive timeout feature. For the web server, the inactive time is configured with the
WEBSERVER command and can be configured for between 600 and 3600 seconds (1200 seconds is the
default). The configuration will take effect during the next administrative session.
The Administrator can disconnect their administrative session from the CLI using the BYE command that
will logout the user. From the web GUI, the administrator can click on the profile icon/image in the upper
right and select logout.
This aspect of the TOE Access security function satisfies FTA_SSL_EXT.1, FTA_SSL.3, and FTA_SSL.4.
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5.7 Trusted Path/Channels
The TOE provides the administrator the ability to export audit records to a TLS-protected syslog server.
The TOE’s TLS syslog configurations allows the administrator to specify the root CA certificate (as well as
any needed intermediate CA certificates and any CRLs for revocation) for the TOE to use when validating
the syslog server’s certificates.
The administrator can connect to the TOE using its HTTPS or SSH protected administration channel.
The Trusted Path/Channels security function satisfies FTP_ITC.1 and FTP_TRP.1/Admin.
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6 Protection Profile Claims
This ST conforms to the collaborative Protection Profile for Network Devices, Version 2.2e, 23 March 2020
[cPPND] and including the following optional and selection-based SFRs: FAU_STG.1, FCS_HTTPS_EXT.1;
FCS_SSHS_EXT.1; FCS_TLSC_EXT.1; FCS_TLSS_EXT.1; FIA_X509_EXT.1/Rev; FIA_X509_EXT.2;
FIA_X509_EXT.3; and FMT_MTD.1/CryptoKeys.
As explained in Section 2, Security Problem Definition, the Security Problem Definition of the [cPPND] has
been included by reference into this ST.
As explained in Section 3, Security Objectives, the ST reproduces the security objectives for the
operational environment from [cPPND].
As explained in Section 4, IT Security Requirements, the SFRs have all been drawn from [cPPND]. As such,
operations on SFRs already performed in that PP are not identified in this ST. Rather; the SFRs have been
copied from [cPPND] and any formatting used in that PP has been removed. Operations performed on
SFRs in the writing of this ST are identified in accordance with the conventions described in Section 1.3.
The SARs for the TOE are included by reference from the [cPPND].
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7 Rationale
This ST includes by reference the [cPPND] Security Problem Definition and SARs and reproduces the
security objectives for the Operational Environment. The ST makes no additions to the [cPPND]
assumptions. [cPPND] SFRs have been reproduced with the Protection Profile operations completed.
Operations on the SFRs follow [cPPND] application notes and assurance activities. Consequently, [cPPND]
rationale applies but is incomplete. The TOE Summary Specification rationale below serves to complete
the rationale required for the security target.
7.1 TOE Summary Specification Rationale
Each subsection in Section 5, the TOE Summary Specification (TSS), describes a security function of the
TOE. Each description identifies the SFRs that are covered by that description and, as such, provides the
rationale that indicates which requirements are satisfied by aspects of the corresponding security
function. The security functions work together to satisfy all of the security functional requirements.
Furthermore, all of the security functions are necessary in order for the TSF to provide the required
security functionality.
This section, in conjunction with the TSS, provides evidence that the security functions are suitable to
meet the TOE security requirements. The collection of security functions work together to provide all of
the security requirements. The security functions described in the TSS are all necessary for the required
security functionality in the TSF. Table 11: Security Functions vs. Requirements Mapping summarizes the
relationship between security requirements and security functions.
Table 11: Security Functions vs. Requirements Mapping
Security
audit
Cryptographic
support
Identification
and
authentication
Security
management
Protection
of
the
TSF
TOE
access
Trusted
path/channels
FAU_GEN.1 X
FAU_GEN.2 X
FAU_STG.1 X
FAU_STG_EXT.1 X
FCS_CKM.1 X
FCS_CKM.2 X
FCS_CKM.4 X
FCS_COP.1/DataEncryption X
FCS_COP.1/SigGen X
FCS_COP.1/Hash X
FCS_COP.1/KeyedHash X
FCS_NTP_EXT.1 X
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Security
audit
Cryptographic
support
Identification
and
authentication
Security
management
Protection
of
the
TSF
TOE
access
Trusted
path/channels
FCS_RBG_EXT.1 X
FCS_SSHS_EXT.1 X
FCS_TLSC_EXT.1 X
FCS_TLSS_EXT.1 X
FIA_AFL_EXT.1 X
FIA_PMG_EXT.1 X
FIA_UIA_EXT.1 X
FIA_UAU_EXT.2 X
FIA_UAU.7 X
FIA_X509_EXT.1/Rev X
FIA_X509_EXT.2 X
FIA_X509_EXT.3 X
FMT_MOF.1/ManualUpdate X
FMT_MTD.1/CoreData X
FMT_SMF.1 X
FMT_SMR.2 X
FPT_APW_EXT.1 X
FPT_SKP_EXT.1 X
FPT_TST_EXT.1 X
FPT_TUD_EXT.1 X
FPT_STM_EXT.1 X
FTA_SSL_EXT.1 X
FTA_SSL.3 X
FTA_SSL.4 X
FTA_TAB.1 X
FTP_ITC.1 X
FTP_TRP.1/Admin X