Windows Mobile 5.0 MSFP
Security Target
EAL2 augmented with ALC_FLR.1
Version 1.0
February 2008
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Document History
Version Date Author Description
1.0 25-Feb-08 Doug Stuart Released.
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Table of Contents
1 Introduction........................................................................................................................... 7
1.1 Overview ........................................................................................................................ 7
1.2 ST and TOE identification .............................................................................................. 8
1.3 Conformance Claims...................................................................................................... 9
1.4 Strength of function ........................................................................................................ 9
1.5 Document conventions................................................................................................. 10
1.6 Terminology.................................................................................................................. 10
1.7 References................................................................................................................... 14
1.8 Document organization ................................................................................................ 14
2 TOE Description.................................................................................................................. 15
2.1 Overview ...................................................................................................................... 15
2.2 User environment......................................................................................................... 15
2.3 Operator environment .................................................................................................. 16
2.4 Enterprise environment................................................................................................ 16
2.5 TOE Security Features................................................................................................. 17
2.6 Scope of the TOE......................................................................................................... 19
3 TOE Security Environment ................................................................................................ 20
3.1 Overview ...................................................................................................................... 20
3.2 Assumptions................................................................................................................. 20
3.3 Threats to security........................................................................................................ 21
4 Security objectives ............................................................................................................. 22
4.1 Overview ...................................................................................................................... 22
4.2 Security objectives for the TOE.................................................................................... 22
4.3 Security objectives for the environment ....................................................................... 23
4.4 Security objectives for the non-IT environment............................................................ 23
5 IT Security Requirements................................................................................................... 25
5.1 Overview ...................................................................................................................... 25
5.2 TOE Security Functional Requirements....................................................................... 25
5.2.1 Device data protection ............................................................................................. 27
5.2.2 Device application control........................................................................................ 30
5.2.3 Secure enterprise access ........................................................................................ 33
5.2.4 Device configuration control .................................................................................... 36
5.2.5 Device access control.............................................................................................. 38
5.2.6 Device security management .................................................................................. 42
5.3 TOE Security Assurance Requirements ...................................................................... 47
5.4 Security Requirements for the IT Environment............................................................ 48
5.4.1 FCS: Cryptographic support .................................................................................... 49
5.4.2 FIA: Identification and Authentication ...................................................................... 52
5.4.3 FMT: Security management .................................................................................... 53
5.4.4 FTP: Trusted path/channel ...................................................................................... 54
6 TOE Summary Specification.............................................................................................. 55
6.1 Overview ...................................................................................................................... 55
6.2 Security Functions........................................................................................................ 55
6.2.1 Device data protection ............................................................................................. 55
6.2.2 Device application control........................................................................................ 57
6.2.3 Secure enterprise access ........................................................................................ 57
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6.2.4 Device configuration control .................................................................................... 58
6.2.5 Device access control.............................................................................................. 59
6.2.6 Device security management .................................................................................. 60
6.3 Strength of Function claim ........................................................................................... 62
6.4 Assurance Measures ................................................................................................... 63
6.4.1 Configuration management ..................................................................................... 63
6.4.2 Delivery and operation............................................................................................. 63
6.4.3 Development............................................................................................................ 63
6.4.4 Guidance documents............................................................................................... 64
6.4.5 Life cycle support..................................................................................................... 64
6.4.6 Tests ........................................................................................................................ 64
6.4.7 Vulnerability assessment ......................................................................................... 65
7 Rationale.............................................................................................................................. 66
7.1 Overview ...................................................................................................................... 66
7.2 Security objectives rationale ........................................................................................ 67
7.2.1 Security objectives for the TOE ............................................................................... 67
7.2.2 Security objectives for the non-IT environment ....................................................... 69
7.2.3 Security objectives for the IT environment............................................................... 70
7.3 Security requirements rationale ................................................................................... 71
7.3.1 Dependency analysis............................................................................................... 71
7.3.2 Rationale for not addressing all dependencies........................................................ 74
7.3.3 Rationale for explicit security functional requirements ............................................ 74
7.3.4 IT environment SFR dependency demonstration.................................................... 75
7.3.5 TOE IT requirements correspondence .................................................................... 77
7.3.6 IT environment requirements correspondence........................................................ 81
7.3.7 TOE assurance requirements.................................................................................. 83
7.3.8 Demonstration of Mutual Support............................................................................ 83
7.4 TOE summary specification rationale .......................................................................... 84
7.4.1 IT security functions................................................................................................. 84
7.4.2 Assurance measures ............................................................................................... 89
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List of Tables
Table 1 – ST and TOE identification information............................................................................. 8
Table 2 – Terminology................................................................................................................... 10
Table 3 – TOE security functions and features ............................................................................. 17
Table 4 – Assumptions.................................................................................................................. 20
Table 5 – Threats to security......................................................................................................... 21
Table 6 – Security objectives for the TOE..................................................................................... 22
Table 7 – Security objectives for the IT environment .................................................................... 23
Table 8 – Security objectives for the non-IT environment............................................................. 23
Table 9 – Summary of TOE Security Functional Requirements ................................................... 25
Table 10 – Summary of TOE security assurance requirements ................................................... 47
Table 11 – Summary of IT environment security functional requirements.................................... 48
Table 12 – Mapping of TOE security objectives to threats............................................................ 67
Table 13 – Mapping of non-IT objectives to assumptions............................................................. 69
Table 14 – Mapping of IT environment objectives to assumptions ............................................... 70
Table 15 – TOE SFR dependency demonstration ........................................................................ 71
Table 16 – Rationale for explicitly stated security functional requirements .................................. 74
Table 17 – IT environment SFR dependency demonstration........................................................ 75
Table 18 – Mapping TOE SFRs to objectives ............................................................................... 77
Table 19 – Mapping IT environment SFRs to objectives .............................................................. 81
Table 20 – Mapping TOE SFRs to TOE security functions........................................................... 84
Table 21 – Assurance measures rationale.................................................................................... 89
List of Figures
Figure 1 – Windows Mobile 5.0 MSFP security architecture........................................................... 7
Figure 2 – The TOE operating environment.................................................................................. 15
Figure 3 – TOE Scope................................................................................................................... 19
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1 Introduction
1.1 Overview
1 The Target of Evaluation (TOE), Windows Mobile 5.0 MSFP, is a compact operating
system for use on Pocket PCs and Smartphones, enabling users to securely extend
their corporate Windows desktop to mobile devices.
2 Windows Mobile 5.0 MSFP provides the basis for establishing a secure enterprise
mobile messaging solution that can securely synchronize and access email,
contacts, tasks and calendar while users are away from their corporate network.
Windows Mobile 5.0 MSFP can be managed by Microsoft’s Exchange Server so that
corporate mobile device security policies and standards can be established.
3 Windows Mobile 5.0 MSFP offers device management and security features, and a
broad set of advanced tools and solutions to help businesses meet today’s
demanding data and mobile device security policy requirements.
4 Through a combination of security services, settings, and features, the Windows
Mobile security architecture helps protect critical data and systems from exposure
and theft. Windows Mobile 5.0 MSFP enables the establishment of a strong
password policy and the ability to wipe the device in response to a defined number
of failed authentication attempts.
5 To help simplify enterprise administration of mobile solutions, Windows Mobile also
provides centralized device management features, such as the ability to perform a
remote wipe, verify passwords, and enforce security policies over the air to multiple
devices simultaneously.
6 As illustrated in Figure 1, the security and device management features of Windows
Mobile 5.0 MSFP deliver a secure mobile messaging solution with simplified
administration, increased monitoring, and flexible policy management.
Figure 1 – Windows Mobile 5.0 MSFP security architecture
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1.2 ST and TOE identification
Table 1 – ST and TOE identification information
ST Title Windows Mobile 5.0 MSFP Security Target
ST Version 1.0, 25-Feb-08
TOE Software Windows Mobile Version 5.0 MSFP (Messaging and Security Feature
Pack (MSFP), derived from Windows CE 5.1, which includes the following
editions:
• Windows Mobile 5.0 MSFP for Smartphone
• Windows Mobile 5.0 MSFP for Pocket PC Phone Edition
This evaluation includes the following Adaptation Kit Updates (AKUs):
• Build 14847 AKU 2.0
• Build 14914 AKU 2.1
• Build 14928 AKU 2.2
• Build 14929 AKU 2.2.1
• Build 14932 AKU 2.2.2
• Build 14955 AKU 2.3
• Build 14957 AKU 2.3.1
• Build 14959 AKU 2.3.2
• Build 14960 AKU 2.4
• Build 14967 AKU 2.5
• Build 14989 AKU 2.6
• Build 14992 AKU 2.6.1
• Build 14994 AKU 2.6.2
• Build 14995 AKU 2.6.3
• Build 15096 AKU 3.0
• Build 15097 AKU 3.0.1
• Build 15314 AKU 3.1
• Build 15633 AKU 3.2
• Build 15671 AKU 3.3
• Build 15673 AKU 3.3.1
• Build 15359 AKU 3.4
• Build 15361 AKU 3.4.1
• Build 15362 AKU 3.4.2
• Build 15363 AKU 3.4.3
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• Build 15704 AKU 3.5
• Build 15705 AKU 3.5.1
• Build 15706 AKU 3.5.2
Assurance Level EAL2 augmented with ALC_FLR.1
CC Identification Common Criteria for Information Technology (IT) Security Evaluation,
Version 2.3, August 2005.
International Standard – International Organization for Standardization
(ISO)/International Electrotechnical Commission (IEC) 15408:1999.
1.3 Conformance Claims
7 The following conformance claims are made for the TOE and ST:
a) Part 2 extended. Extends the Common Criteria for Information Technology
Security Evaluation Part 2: Security functional requirements, version 2.3,
August 2005, CCMB-2005-002.
b) Part 3 conformant, EAL2 augmented. Conformant with Common Criteria for
Information Technology Security Evaluation Part 3: Security assurance
requirements, version 2.3, August 2005, CCMB-2005-003. Evaluation is
EAL2 augmented with ALC_FLR.1.
1.4 Strength of function
8 The EAL2 (augmented with ALC_FLR.1) Common Criteria evaluation of Windows
Mobile 5.0 MSFP provides a basic level of independently assured security.
9 The assurance requirements and the minimum Strength of Function (SOF) of basic
(SOF-basic) were chosen to be consistent with this security objective.
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1.5 Document conventions
10 Part 2 of the Common Criteria defines an approved set of operations that may be
applied to security functional requirements. Following are the approved operations
and the document conventions that are used within this ST to depict their
application:
a) Assignment. The assignment operation provides the ability to specify an
identified parameter within a requirement. Assignments are depicted using
bolded text and are surrounded by square brackets as follows [assignment].
b) Selection. The selection operation allows the specification of one or more
items from a list. Selections are depicted using bold italics text and are
surrounded by square brackets as follows [selection].
c) Refinement. The refinement operation allows the addition of extra detail to a
requirement. Refinements are indicated using bolded text, for additions, and
strike-through, for deletions.
d) Iteration. The iteration operation allows a component to be used more than
once with varying operations. Iterations are depicted by placing a letter at the
end of the component identifier as follows FDP_IFF.1a and FDP_IFF.1b.
1.6 Terminology
Table 2 – Terminology
Term Description
Active Directory Active Directory is a Microsoft directory service. It supports a
single unified view of objects on a network and allows locating
and managing resources faster and easier.
Application Revocation List The TOE maintains a list of applications that have been
revoked. The Security Loader module will check this list before
making a decision about permitting the install or execution of
an application.
Applications End-user applications that make use of either the voice or
data services offered by the TOE.
Authenticated Channel Assured identification of the end points of a communications
channel.
Authentication The process of determining whether someone or something is,
in fact, who or what it is declared to be.
Authentication Data Information used to verify the claimed identity of a user.
Credentials Credentials include identifying attributes and associated
authentication data that is used to validate requests
authentication requests.
Device Identity A unique identifier that exists for the Mobile Device.
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Term Description
Device Lock The local lock of a device to end a session. Local device
authentication is required to unlock the Mobile Device.
Device Manager A term used within the Open Mobile Alliance to specify the
server that can provide OMA-DM messages to the Mobile
Device.
Device Resources Those components of a mobile device that can be accessed
and utilized by executable code to run processes and perform
functions.
Enterprise Administrator The role used to describe the enterprise IT administrator
responsible for establishing security policies for Mobile
Devices.
Enterprise Exchange Server The Microsoft Exchange Server used within the enterprise to
communicate with Mobile Devices to provide policy and
configuration information and for user's to access their
Exchange Mailbox.
Enterprise User Identifier The alias used by the Mobile User to access the corporate
network.
Exchange ActiveSync Exchange ActiveSync is an Exchange synchronization
protocol designed for keeping an Exchange mailbox
synchronized with a Windows Mobile device. The protocol is
based on HTTP, SSL/TLS, and XML and is a part of
Exchange Server.
Exchange ActiveSync
Mailbox Policy
The password and device management policy that can be
applied to a device by the Enterprise Administrator through
Exchange ActiveSync.
Exchange Commands Commands that can be sent to the Mobile Device to either
perform a remote wipe or remove a partnership.
Exchange Management
Console
The external user interface provided for the Enterprise
Administrator to establish mobile device policy and security
configurations.
Executable Code A file whose contents are meant to be interpreted as a
program by the mobile device. Will contain the binary
representation of machine instructions of the specific
processor of the mobile device.
Local Device Wipe The wipe of TOE Security Function (TSF) and user data in
response to reaching the threshold for failed authentication
attempts.
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Term Description
Mailbox Items Items that can be synchronized through Exchange ActiveSync
such as emails, contacts, tasks and calendar appointments.
MSFP Messaging and Security Feature Pack is an addition to the
Windows Mobile 5.0 operating system that has been
incorporated since AKU 2.0.
Mobile Device The physical device, either Smartphone or Pocket PC, that
provides the hardware platform for the installation of the
Windows Mobile 5.0 MSFP operating system and additional
OEM applications and services.
Mobile Device Authentication The local entry of a password by the user to gain access to
the Mobile Device.
Mobile Operator The entity that provides the network infrastructure for the
Mobile Device to communicate with other devices and the
enterprise network.
Mobile User The authorized individual in control of the Mobile Device.
Object An entity within the TSF Scope of Control (TSC) that contains
or receives information and upon which subjects perform
operations.
OMA-CP Open Mobile Alliance Client Provisioning. A one way protocol
that provides a WAP push and is typically used for
bootstrapping.
OMA-DM Open Mobile Alliance Device Management. A protocol
designed for management of small mobile devices such as
mobile phones, PDAs and palm top computers. OMA-DM
provides continuous provisioning that modifies the device
configuration settings when necessary and can be repeated
on multiple occasions.
Provisioning The act of configuring the Mobile Device including both
enabling or disabling of features. Provisioning can be
performed Over the Air (OTA) or locally via installation of an
appropriately formed provisioning file.
Push Proxy Gateway A WAP Push Proxy is a gateway intended to provide push
connectivity between wired and wireless networks.
Remote Device Wipe The wipe of TSF and user data in response to an Exchange
Command issued from the Enterprise Exchange Server.
Role A predefined set of rules establishing the allowed interactions
between a user and the TOE.
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Term Description
Secure Channel Assured identification of the end points of a communication
channel and protection of the channel data from modification
or disclosure.
Secure Sockets Layer (SSL) A protocol that supplies secure data communication through
data encryption and decryption. SSL enables communications
privacy over networks.
Security Policies Used to configure security settings that are then enforced with
the help of security roles and certificates. Security policies
enforce security requirements for all OTA data messages that
a Mobile Device receives.
Security Roles Used to allow or restrict access to Windows Mobile powered
device resources. The security role is based on the message
origin and how the message is signed.
Service Indicator An SI message can be sent by the Mobile Operator to notify
users of new services, service updates, and provisioning
services. The TOE can be configured to reject SI messages.
Service Loader An SL message can be sent by the Mobile Operator to
provision the Mobile Device. The TOE can be configured to
reject SL messages.
Subject An entity within the TSC that causes operations to be
performed.
Trusted IT Product A TOE that has been evaluated against the requirements of
the Common Criteria.
Trusted Provisioning Server The TPS is a source of provisioning information that can be
trusted by a Mobile Device.
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1.7 References
[1] Deploying Windows Mobile 6 Powered Devices with Microsoft
Exchange Server 2007, Microsoft white paper, Nov-07.
[2] Windows Mobile 5.0 MSFP Installation and Administrator Guide, Feb-
08.
[3] Security for Windows Mobile Messaging in the Enterprise, Microsoft
white paper, Feb-07.
[4] Microsoft Windows CE and Windows Mobile Enhanced Cryptographic
Provider 5.00.911762, 5.01.01603 and 5.04.17228: FIPS 140-2
Documentation (Security Policy), Microsoft document, 30-Mar-07
1.8 Document organization
11 This document is organized into the following sections:
a) Section 1 provides the introductory material for the ST.
b) Section 2 provides the TOE description and includes the physical and logical
scope of the TOE.
c) Section 3 describes the expected environment for the TOE. This section also
defines the set of threats that are to be addressed by either the technical
countermeasures implemented within the TOE or through environmental
controls.
d) Section 4 defines the security objectives for the TOE and environment.
e) Section 5 contains the functional and assurance requirements derived from
the Common Criteria, Part 2 and 3, respectively that must be satisfied by the
TOE.
f) Section 6 provides a summary of the TOE specification, identifying the IT
security functions provided by the TOE and also the assurance measures
designed to meet the assurance requirements.
g) Section 7 provides a rationale to explicitly demonstrate that security objectives
have been satisfied by the TOE.
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2 TOE Description
2.1 Overview
12 Windows Mobile 5.0 MSFP is a single user operating system designed for use with
Smartphone and Pocket PC devices. The intended method of use of the TOE is as a
mobile messaging solution that allows users to stay connected to their email,
contacts and calendar whilst away from their enterprise workstation.
13 The TOE operates in a specific operational environment, the user environment,
and is supported by capabilities that exist within the operator and enterprise
environments. The relationships between the TOE and relevant elements within
each of the operating environments are depicted in Figure 2 below.
Figure 2 – The TOE operating environment
2.2 User environment
14 The Mobile Device is the hardware upon which the TOE operates. It is used for
mobile communications in variable locations such as would be expected with a
mobile phone.
15 Windows Mobile 5.0 MSFP provides the basis for the TOE. This is a single user
operating system and includes a suite of services and functions that provides
Window Mobile powered devices with a set of security functionality as specified in
this ST.
16 The manufacturers of mobile devices that install and employ the Windows Mobile 5.0
MSFP operating system for their devices, often include additional applications and
services that are specific to their devices and service offerings.
17 Each Mobile Device also has specific hardware and drivers that have been
developed for interfacing with the operator environment and general network
infrastructure.
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2.3 Operator environment
18 The operator environment is provided and controlled by the Mobile Operator.
Continual provisioning can occur within this environment so that the Mobile Device
can be updated with new capabilities and services.
19 The Mobile Device must also be capable of communicating with other devices and
systems using a range of communication mechanisms, including WAP, Wi-Fi and
voice.
2.4 Enterprise environment
20 Users can use the TOE to gain access to resources residing on corporate networks
through use of the Exchange ActiveSync protocol which establishes a secure
communications link between the enterprise and the Mobile Device using methods
such as SSL/HTTPS.
21 The TOE is supported by a trusted management console which provides
configuration and policy data to the TOE over the Exchange ActiveSync
communications channel. The Exchange Management Console is provided by
Exchange Server, which while outside the scope of this evaluation, provides a
mechanism for securely communicating and configuring the TOE. The TOE sends
and receives email, calendar and contacts information to and from a trusted email
server that has been configured to do so.
22 Communication between the TOE and other components within the enterprise
environment are mediated by another trusted IT product, a communications proxy,
which provides the access point for the enterprise. The communications proxy does
not form part of the TOE, however, it does provide the capability for the TOE to
establish a trusted communications channel over which user and security policy data
can be transferred.
23 The proxy is an integrated edge security gateway that can act as a cryptographic
termination point and provide firewall functionality. The proxy also provides the Point
of Presence at which the Mobile Device must have a URL so that connectivity can
be provided back to the enterprise network.
24 Active Directory also plays a role in a managed Windows Mobile solution as it
provides authentication services for supplied user credentials or digital certificates
that are provided by the Mobile User through the Mobile Device.
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2.5 TOE Security Features
25 Table 3 highlights the range of security functions and features that the TOE
implements.
Table 3 – TOE security functions and features
Security function TOE security feature
SSL/TLS channel encryption. SSL/TLS encrypts data
transmitted between the device and server, over-the-air or
through a wired connection.
Device data protection. The
TOE provides the capability to
protect data in transit.
Certified cryptographic module. The TOE includes a
certified FIPS validated cryptographic module. Applications
can make use of cryptographic modules to perform
cryptographic operations.
Controlled application installation. The TOE can be
configured to only permit applications signed with a trusted
certificate to be installed on the operating system.
Device application control.
The TOE provides the
capability to only permit trusted
applications to be installed and
executed on the mobile device. Controlled application execution. Code execution control
allows the device to be locked so that only applications signed
with a trusted certificate can run.
Secure channel. Windows Mobile establishes a secure
channel for communicating with another trusted IT product.
Secure enterprise access.
The TOE provides the
capability to securely
synchronize data items with
the Mobile User’s Exchange
Mailbox.
Synchronization of Mailbox Items. Mobile Users can apply
the secure channel to synchronize their emails, tasks,
calendar and contacts with their enterprise mailbox.
Exchange ActiveSync Mailbox Policy. The Enterprise
Administrator can use the secure channel to push down an
enterprise policy for the Mobile Device.
Trusted provisioning. Windows Mobile can implement
secure communications with a trusted source that has the
ability to provide provisioning and configuration data.
Device configuration control.
The TOE provides the
capability to protect against
modification by un-trusted
systems.
Local configuration control. The authenticated user has the
ability to locally manage specific configurations and settings.
Device access control. The
TOE has inbuilt security
mechanisms that can be
enabled to provide controlled
Device authentication and lock. Windows Mobile can be
configured to require a password to gain access to the Mobile
Device, however, it is possible to receive incoming calls and to
make emergency calls without authenticating.
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Security function TOE security feature
access to the Mobile Device.
Local device wipe. Windows Mobile can be configured to
perform a local device wipe after a specified number of
incorrect login attempts.
Note: This feature only wipes TSF and user data on the
Mobile Device. Data is not wiped from installed removable
storage cards.
Security roles. Windows Mobile maintains multiple
management roles which determine access to device
resources.
Security policies. Security policies establish the foundation
configuration for the Mobile Device, they can be set to
configure low-level device configuration policies and also
implement enterprise password policy.
Device security
management. The TOE has
configurable security policies
that establish which actions a
user or application may take.
Remote wipe. The Enterprise Administrator can issue a
command to wipe a managed device if it has been lost or
stolen.
Note: This feature only wipes TSF and user data on the
Mobile Device. Data is not wiped from installed removable
storage cards.
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2.6 Scope of the TOE
26 The TOE comprises the core software components of Windows Mobile 5.0 MSFP
operating system. Windows Mobile is an operating system that installs on a Mobile
Device which incorporates hardware and firmware components. Additionally, mobile
applications are installed on the Windows Mobile operating system and utilize the
services of the TOE.
27 Windows Mobile 5.0 MSFP is available on a variety of devices from a variety of
manufacturers and Mobile Operators. The claimed security functionality of the TOE
is standard across all types of devices, from Pocket PCs to Smartphones, regardless
of which model or device that the operating system is installed on.
28 The Mobile Device itself is not part of the TOE. The TOE communicates with
several other physically separate components within the IT Environment, and these
again do not form part of the TOE as they are within a trusted IT environment.
29 In the evaluated configuration, all communication between the TOE and the
Exchange Management Console, Exchange Server, and data resources are
mediated by the Communications Proxy. The Communications Proxy is a trusted IT
product that is used to establish a trusted path for the secure communication of both
TSF and user data.
30 Figure 3 illustrates the TOE boundary and the scope of the evaluation.
TARGET OF EVALUATION - OPERATING SYSTEM LAYER
APPLICATION LAYER
GWES
OEM APPLICATIONS
INDEPENDENT
SOFTWARE VENDORS
SECURITY
POLICY ENGINE
REMOTE
CONNECTIVITY
COMMS &
NETWORKING
DEVICE
MANAGER
KERNEL
STORAGE
MANAGER
MICROSOFT WINDOWS MOBILE APPLICATIONS
SHELL SERVICES
CORE (includes coredll, winsock, commctrl, wininet and commdlg
AUTHENTICATION
SERVICES
CRYPTOGRAPHIC
SERVICES
OEM LAYER
HARDWARE
DISPLAY
DRIVERS
DEVICE
DRIVERS
FILE SYSTEM
DRIVERS
OEM ADAPTATION LAYER
BOOT LOADER CONFIG FILES
Figure 3 – TOE Scope
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3 TOE Security Environment
3.1 Overview
31 This section describes the nature of the security problem that the TOE is designed to
address. The security problem is described through assumptions about the security
aspects of the environment and any threats to the assets that the TOE will be
providing protection.
3.2 Assumptions
Table 4 – Assumptions
Identifier Assumption statement
A.USAGE Mobile Users are trusted to:
• follow user guidance,
• ensure that the TOE continues to operate in the evaluated
configuration,
• only permit ActiveSync connections between the Mobile Device
and trusted computing devices, and
• store the Mobile Device when not in use in a physically
protected area that is appropriate for the information processed
by the TOE.
A.DELIVERY The security enforcing components of the TOE will not be modified by
either the Mobile Operator or the manufacturer of the Mobile Device
during the delivery process.
A.IT_ENTERPRISE The Enterprise Exchange Server and Active Directory Server are
located within the enterprise boundary and are protected from
unauthorized logical/physical access.
A.IT_MOBILE The Trusted Provisioning Server is located within the Mobile Operator’s
network boundary and is protected from unauthorized logical and
physical access.
A.ADMIN The Enterprise Administrator is not careless, willfully negligent, or
hostile, and will follow and abide by the instructions provided by
administrator documentation.
A.OPERATOR The Mobile Operator will not transmit configuration messages that
undermine the security objectives of the TOE.
A.I&A_ENTERPRISE The IT environment will provide mechanisms for authenticating Mobile
Users when accessing their mailbox and other resources within the
corporate network.
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Identifier Assumption statement
A.COMMS_ENT The IT environment will provide the server-side of a secure channel
between the Enterprise Exchange Server and the Mobile Device.
A.COMMS_NET The IT environment will provide the server-side of a secure channel
between the Trusted Provisioning Server and the Mobile Device.
A.SEC_POLICY The IT environment will provide a mechanism for setting enterprise
policy and pushing it to the Mobile Device.
3.3 Threats to security
Table 5 – Threats to security
Identifier Threat statement
T.EAVESDROPPING An attacker may compromise the confidentiality of user or TSF data by
monitoring communications between the TOE and either the Enterprise
Exchange Server or Trusted Provisioning Server.
T.INTERCEPT An attacker may compromise the integrity of user data or TSF data by
intercepting and altering communications between the TOE and either
the Enterprise Exchange Server or Trusted Provisioning Server.
T.IMPORT An administrator or user may inadvertently import malicious code to the
TOE, resulting in a compromise of the confidentiality, integrity and/or
availability of user and/or TSF data.
T.MASQUERADE An attacker may masquerade as the Enterprise Exchange Server or a
Trusted Provisioning Server and attempt to compromise the integrity of
the TSF by sending malicious management messages to the TOE.
T.TOE_ACCESS An attacker may gain direct access to a Mobile Device if it is not in the
control of the Mobile User enabling compromise of the confidentiality of
user or TSF data stored on the Mobile Device.
T.WEAK_SECRET A user may select a weak password thereby enabling an attacker to
compromise the confidentiality of user data.
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4 Security objectives
4.1 Overview
32 The security objectives are concise statements of the TOE’s response to the security
problem. Some objectives are to be achieved through the security functionality of the
TOE and some elements of the problem will be addressed through the establishment
of a secure environment in which the TOE must operate.
4.2 Security objectives for the TOE
Table 6 – Security objectives for the TOE
Identifier Objective statement
O.COMMS_CONF The TOE shall preserve the confidentiality of user data and TSF data
transmitted between the TOE and the Enterprise Exchange Server and
the Trusted Provisioning Server.
O.COMMS_INT The TOE shall preserve the integrity of user data and TSF data
transmitted between the TOE and the Enterprise Exchange Server and
the Trusted Provisioning Server.
O.CODE_CTRL The TOE shall prevent the installation and execution of code that has
not been explicitly authorized.
O.MGMT_AUTH The TOE shall ensure that management messages have originated
from a trusted source.
O.USER_AUTH The TOE shall prevent users from requesting access to applications or
data prior to authentication.
O.REMOTE_ADMIN The TOE shall perform administrative actions as directed by the
Enterprise Administrator.
O.SECRET The TOE shall be capable of not allowing the use of weak secrets.
O.REMOTE_WIPE The TOE shall be capable of responding to a command from the
administrator to wipe all TSF data and make user data inaccessible on
the Mobile Device.
O.LOCAL_WIPE The TOE shall be able to make user and TSF data stored on the Mobile
Device inaccessible in response to a defined consecutive number of
failed authentication attempts.
O.ROLES The TOE will maintain a number of roles to distinguish access to
functions of the TOE.
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Identifier Objective statement
O.SESSION_LOCK The TOE shall lock itself after an administrator defined period of
inactivity, or in response to a user initiated request. The user shall be
required to re-authenticate in order to request access to data or
applications, however, users must be capable of using general phone
features and making an emergency call.
4.3 Security objectives for the environment
Table 7 – Security objectives for the IT environment
Identifier Objective statement
OE.I&A_ENTERPRISE The IT environment must authenticate Mobile Users prior to providing
access to enterprise resources.
OE.COMMS_ENT The IT environment must authenticate the end-points and encrypt
communications between the Mobile Device and the Enterprise
Exchange Server.
OE.COMMS_NET The IT environment must authenticate the end-points and encrypt
communications between the Mobile Device and the Trusted
Provisioning Server.
OE.SEC_POLICY The IT environment must provide an administration console for securely
creating and applying security policies and issuing remote commands
to the Mobile Device.
4.4 Security objectives for the non-IT environment
Table 8 – Security objectives for the non-IT environment
Identifier Objective statement
OE.USAGE The Enterprise Administrator shall ensure that Mobile Users are aware
of the need to:
• follow user guidance relating to the operating system, installed
applications and the Mobile Device;
• ensure that the TOE continues to operate in the evaluated
configuration and that if their device is reset there may be a
need to re-provision the Mobile Device into the evaluated
configuration;
• only permit ActiveSync connections between their Mobile
Device and computing devices that can be trusted; and
• store the Mobile Device when not in use in a physically
protected area that is appropriate for the information processed
by the TOE.
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OE.DELIVERY The Device Manufacturer and Mobile Operator shall not modify the
security enforcing components of the TOE during the delivery process.
OE.IT_ENTERPRISE The Enterprise Administrator shall ensure that the Enterprise Exchange
Server and Active Directory Server are protected from unauthorized
logical and physical access.
OE.IT_MOBILE The Mobile Operator shall ensure that the Trusted Provisioning Server
is located within the Mobile Operator’s network boundary and is
protected from unauthorized logical and physical access.
OE.ADMIN The Enterprise Administrator shall not be careless, willfully negligent, or
hostile, and shall follow and abide by the instructions provided by the
administrator documentation.
OE.OPERATOR The Mobile Operator shall not transmit configuration messages that
undermine the security objectives of the TOE.
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5 IT Security Requirements
5.1 Overview
33 This section defines the security requirements satisfied by the TOE. Each
requirement has been extracted from version 2.3 of the Common Criteria, part 2
providing functional requirements and part 3 providing assurance requirements.
5.2 TOE Security Functional Requirements
34 This section contains the security functional components from part 2 of the Common
Criteria with the operations completed.
35 Standard Common Criteria text is in regular black font and the text inserted to
perform an operation on the requirement is in accordance with the conventions
specified in section 1.4 of this ST.
Table 9 – Summary of TOE Security Functional Requirements
Identifier Title
Device data protection
FCS_CKM.1 Cryptographic key generation
FCS_COP.1 Cryptographic operation (SSL/TLS)
FCS_CKM.4 Cryptographic key destruction
Device application control
FDP_ACC.1a Subset access control (Device Application Control SFP)
FDP_ACF.1a Security attribute based access control (Device Application Control SFP)
Secure enterprise access
FDP_IFC.1 Subset information flow control (Secure Enterprise Access SFP)
FDP_IFF.1 Simple security attributes (Secure Enterprise Access SFP)
FTP_ITC.1 Inter-TSF trusted channel
Device configuration control
FDP_ACC.1b Subset access control (Device Configuration Control SFP)
FDP_ACF.1b Security attribute based access control (Device Configuration Control SFP)
Device access control
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Identifier Title
FIA_AFL.1 Authentication failure handling
FIA_ATD.1 User attribute definition
FIA_SOS.1 Verification of secrets
FIA_UAU.1 Timing of authentication
FIA_UAU.7 Protected authentication feedback
FTA_SSL.1.EX TSF-initiated session lock
FTA_SSL.2.EX User-initiated locking
Device security management
FMT_MOF.1a Management of security functions behaviour (Device Data Protection)
FMT_MSA.1a Management of security attributes (Device Application Control SFP)
FMT_MSA.1b Management of security attributes (Secure Enterprise Access SFP)
FMT_MSA.1c Management of security attributes (Device Configuration Control SFP)
FMT_MOF.1b Management of security functions behaviour (Device Access Control)
FMT_MSA.2 Secure security attributes
FMT_MSA.3a Static attribute initialisation (Device Application Control SFP)
FMT_MSA.3b Static attribute initialisation (Secure Enterprise Access SFP)
FMT_MSA.3c Static attribute initialisation (Device Configuration Control SFP)
FMT_SMF.1 Specification of management functions
FMT_SMR.1 Security roles
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5.2.1 Device data protection
5.2.1.1 FCS_CKM.1 Cryptographic key generation
Hierarchical to: No other components.
FCS_CKM.1.1 The TSF shall generate cryptographic keys in accordance with a specified
cryptographic key generation algorithm [
a) RSA, and
b) 3DES]
and specified cryptographic key sizes [
a) 384 through to a maximum 16384 bits (RSA), and
b) 168 bits (3DES)]
that meet the following: [
a) RFC 2437 “PKCS #1: RSA Cryptography Specifications
Version 2.0”, October 1998; and
b) Federal Information Processing Standard (FIPS) Publication
46-3, “Data Encryption Standard”, 25 October 1999.].
Dependencies: [FCS_CKM.2 Cryptographic key distribution, or
FCS_COP.1 Cryptographic operation]
FCS_CKM.4 Cryptographic key destruction
FMT_MSA.2 Secure security attributes
Notes: None.
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5.2.1.2 FCS_COP.1 Cryptographic operation (SSL/TLS)
Hierarchical to: No other components.
FCS_COP.1.1 The TSF shall perform [encryption, decryption and digital signing for
Exchange ActiveSync and Trusted Provisioning communications] in
accordance with a specified cryptographic algorithm [
a) RSA,
b) 3DES, and
c) SHA-1
] and cryptographic key sizes [
a) 384 through to a maximum of 16384 bits (RSA), and
b) 168 bits (3DES),
c) N/A (SHA-1)
] that meet the following: [
a) RFC 2437 “PKCS #1: RSA Cryptography Specifications
Version 2.0”, October 1998;
b) Federal Information Processing Standard (FIPS) Publication
46-3, “Data Encryption Standard”, 25 October 1999; and
c) Federal Information Processing Standard (FIPS) Publication
180-1, “Secure Hash Algorithm”, 17 April 1995].
Dependencies: [FDP_ITC.1 Import of user data without security attributes, or
FDP_ITC.2 Import of user data with security attributes, or
FCS_CKM.1 Cryptographic key generation]
FCS_CKM.4 Cryptographic key destruction
FMT_MSA.2 Secure security attributes
Notes: None.
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5.2.1.3 CKM.4 Cryptographic key destruction
Hierarchical to: No other components.
FCS_CKM.4.1 The TSF shall destroy cryptographic keys in accordance with a specified
cryptographic key destruction method [the CryptDestroyKey and
CryptAcquireContext cryptographic key zeroization operation] that
meets the following: [FIPS 140-1 or 140-2 Level 1].
Dependencies [FDP_ITC.1 Import of user data without security attributes, or
FDP_ITC.2 Import of user data with security attributes, or
FCS_CKM.1 Cryptographic key generation]
FMT_MSA.2 Secure security attributes
Notes: All keys are destroyed and their memory location zeroized when the
CryptDestroyKey is called on the provided key handle. Private keys are
destroyed when CryptAcquireContext is called.
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5.2.2 Device application control
5.2.2.1 FDP_ACC.1a Subset access control (Device Application Control SFP)
Hierarchical to: No other components.
FDP_ACC.1a.1 The TSF shall enforce the [Device Application Control SFP] on [
a) Subjects:
i. Cabinets (cab and cpf file extension),
ii. Themes (hme and tsk file extensions),
iii. Dynamic Link Libraries (dll file extensions), and
iv. Executables (exe file extensions).
b) Objects:
i. Device resources.
c) Operations:
i. Install an application (Cabinet or Theme) on the TOE, and
ii. Execute an application (DLL or Executable) on the TOE].
Dependencies: FDP_ACF.1 Security attribute based access control
Notes: The Device Application Control SFP specifies the rules for implementing
controls associated with both installing and executing applications on the
TOE.
This SFR identifies the four file types that are controlled under this policy,
to include all files that can be executed on the TOE, executables and
dynamic link libraries, and all files that can be used to install new
applications or themes onto the Mobile Device.
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5.2.2.2 FDP_ACF.1a Security attribute based access control (Device Application
Control SFP)
Hierarchical to: No other components
FDP_ACF.1a.1 The TSF shall enforce the [Device Application Control SFP] to objects
based on the following: [
a) All subjects:
i. Developer name, and
ii. Digital signature.
b) Device resources
i. Object identifier].
FDP_ACF.1a.2 The TSF shall enforce the following rules to determine if an operation
among controlled subjects and controlled objects is allowed: [
a) All attempts to install an application (Cabinet or Theme) on
the TOE:
i. Cabinet or Theme files digitally signed with a certificate
that exists in the SPC certificate store are permitted to
access device resources and install on the TOE.
ii. Unsigned Cabinet or Theme files require permission from
the Mobile User to access devices resources and install
on the TOE.
iii. Cabinet or Theme files digitally signed with an invalid
certificate require permission from the Mobile User to
access device resources and install on the TOE.
b) All attempts to execute an application (Executables or DLLs)
on the TOE:
i. Executables or DLLs digitally signed with a certificate
that exists in the Privileged Execution Trust Authorities
certificate store are permitted to access device resources
and execute on the TOE.
ii. Unsigned Executables or DLLs will require permission
from the Mobile User to access device resources and
execute on the TOE.
iii. Executables or DLLs digitally signed with an invalid
certificate will require permission from the Mobile User to
access device resources and execute on the TOE].
FDP_ACF.1a.3 The TSF shall explicitly authorise access of subjects to objects based on
the following additional rules: [
a) Executable code that resides in Read Only Memory (ROM) is
permitted to execute without a digital signature].
FDP_ACF.1a.4 The TSF shall explicitly deny access of subjects to objects based on the
following additional rules[
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a) If the application attempting to execute or install is listed in
the Application Revocation List on the TOE].
Dependencies: FDP_ACC.1 Subset access control
FMT_MSA.3 Static attribute initialisation
Notes: The Mobile Device must be configured correctly to implement the Device
Application Control SFP as described above.
To control the installation of applications on the TOE the following security
policies must be appropriately applied:
• Unsigned Themes Policy (SECPOLICY_UNSIGNEDTHEMES)
• Unsigned CABS Policy (SECPOLICY_UNSIGNEDCABS)
• Unsigned Prompt Policy (SECPOLICY_UNSIGNEDPROMPT)
• Unsigned Applications Policy (SECPOLICY_UNSIGNEDAPPS)
The correct application of these policies to enforce the Device Application
Control SFP is described in the Windows Mobile 5.0 MSFP Installation
and Administrator Guide (Ref. [2]).
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5.2.3 Secure enterprise access
5.2.3.1 FDP_IFC.1 Subset information flow control (Secure Enterprise Access SFP)
Hierarchical to: No other components
FDP_IFC.1.1 The TSF shall enforce the [Secure Enterprise Access SFP] on [
a) Subjects:
i. Mobile Device, and
ii. Enterprise Exchange Server.
b) Information:
i. Exchange ActiveSync Mailbox Policy,
ii. Exchange Commands, and
iii. Mailbox Items.
c) Operations:
i. Synchronize Mailbox Items,
ii. Apply Exchange ActiveSync Mailbox Policy, and
iii. Receive Remote Wipe Command].
Dependencies: FDP_IFF.1 Simple security attributes
Notes: The Secure Enterprise Access SFP demonstrates that the Mobile Device
communicates securely with the Enterprise Exchange Server for three
different types of information exchanges.
The Exchange Server can provide updates of security policy, known as
the Exchange ActiveSync Mailbox Policy, which contains specific details
on enterprise password policy for the Mobile Device.
The Mobile Device can synchronize data items contained in the Mobile
Users enterprise mailbox, items such as email, calendar, tasks, contacts,
and files.
The Enterprise Administrator can also issue Exchange Commands
through the Enterprise Exchange Server to remove existing device
partnerships, or to remotely wipe the Mobile Device of all user and TSF
data.
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5.2.3.2 FDP_IFF.1 Simple security attributes (Secure Enterprise Access SFP)
Hierarchical to: No other components
FDP_IFF.1.1 The TSF shall enforce the [Secure Enterprise Access SFP] based on
the following types of subject and information security attributes: [
a) Mobile Device:
i. Root (system) certificate store.
b) Enterprise Exchange Server:
i. Private key].
FDP_IFF.1.2 The TSF shall permit an information flow between a controlled subject
and controlled information via a controlled operation if the following rules
hold: [
a) For all specified operations the Mobile Device must have the
certificate that relates to the private key of the Enterprise
Exchange Server located within the Root (system) Certificate
Store in order to establish an authenticated and secure
connection
b) The Mobile Device must have SSL/TLS encryption enabled
for enterprise communications].
FDP_IFF.1.3 The TSF shall enforce the [None].
FDP_IFF.1.4 The TSF shall provide the following [capabilities for each operation:
a) If the IT environment successfully authenticates the Mobile
User Mailbox Items can be synchronized with the Exchange
Mailbox in accordance with the rules established by the
Mobile User.
b) Apply new or modified Exchange ActiveSync Mailbox Policy
pushed from the Enterprise Exchange Server to the TOE.
c) In response to receipt of the Remote Wipe Command from
the Enterprise Exchange Server the TOE will wipe all TSF
and user data on the TOE].
FDP_IFF.1.5 The TSF shall explicitly authorise an information flow based on the
following rules: [None].
FDP_IFF.1.6 The TSF shall explicitly deny an information flow based on the following
rules: [None].
Dependencies: FDP_IFC.1 Subset information flow control
FMT_MSA.3 Static attribute initialisation
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Notes: The Secure Enterprise Access SFP relates to the Exchange ActiveSync
capability and not Desktop ActiveSync (often referred to simply as
ActiveSync).
Using SSL/TLS to protect Exchange ActiveSync communications is a
configurable setting that is described in the Windows Mobile 5.0 MSFP
Installation and Administrator Guide (Ref. [2]).
Data stored on an inserted removable storage card will not be wiped.
Once device wipe command has been issued by the Enterprise Exchange
Server device wipe will only occur once the message has been received
by the target Mobile Device.
5.2.3.3 FTP_ITC.1 Inter-TSF trusted channel
Hierarchical to: No other components.
FTP_ITC.1.1 The TSF shall provide a communication channel between itself and a
remote trusted IT product that is logically distinct from other
communication channels and provides assured identification of its end
points and protection of the channel data from modification or disclosure.
FTP_ITC.1.2 The TSF shall permit [the TSF or the remote trusted IT product] to
initiate communication via the trusted channel.
FTP_ITC.1.3 The TSF shall initiate communication via the trusted channel for
[synchronizing Mailbox Items].
Dependencies: No dependencies.
Notes: An ISA server at the enterprise boundary provides an application-layer
firewall to control information flow back to the enterprise mail server and
other data resources. The ISA server also provides a termination point for
encrypted communications with the Mobile Device.
The use of a Microsoft ISA Server at the enterprise boundary is
considered best practice and is Microsoft’s recommended architecture for
deployment of a mobile messaging solution.
The Trusted IT product initiates communication via the trusted channel for
updating the Exchange ActiveSync Mailbox Policy and sending Exchange
Commands such as Perform Remote Wipe. This functionality is required
by the IT environment.
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5.2.4 Device configuration control
5.2.4.1 FDP_ACC.1b Subset access control (Device Configuration Control SFP)
Hierarchical to: No other components.
FDP_ACC.1b.1 The TSF shall enforce the [Device Configuration Control SFP] on [
a) Subjects:
i. Mobile Operator (SECROLE_OPERATOR),
ii. Trusted Provisioning Server
(SECROLE_OPERATOR_TPS),
iii. Manager (SECROLE_MANAGER),
iv. Enterprise Administrator (SECROLE_ENTERPRISE),
v. Authenticated User (SECROLE_USER_AUTH), and
vi. Unauthenticated User (SECROLE_USER_UNAUTH)
b) Objects:
i. Configuration Service Providers
c) Operations:
i. Query device configuration, and
ii. Modify device configuration].
Dependencies: FDP_ACF.1 Security attribute based access control
Notes: None.
5.2.4.2 FDP_ACF.1b Security attribute based access control (Device Configuration
Control SFP)
Hierarchical to: No other components.
FDP_ACF.1b.1 The TSF shall enforce the [Device Configuration Control SFP] to
objects based on the following: [
a) All subjects:
i. Security role
b) All objects:
ii. Access privilege].
FDP_ACF.1b.2 The TSF shall enforce the following rules to determine if an operation
among controlled subjects and controlled objects is allowed: [
a) Querying the configuration of the Mobile Device will be
permitted if the security role associated with the requesting
subject has the read access privilege for the relevant
Configuration Service Provider being accessed.
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b) Modification of the configuration of the Mobile Device will be
permitted if the security role associated with the requesting
subject has write access privilege for the relevant
Configuration Service Provider].
FDP_ACF.1b.3 The TSF shall explicitly authorise access of subjects to objects based on
the following additional rules: [
a) If a subject has been granted the Manager role
(SECROLE_MANAGER) through the Grant Manager Policy
then the associated security role will be granted the same
privileges as that of Manager].
FDP_ACF.1b.4 The TSF shall explicitly deny access of subjects to objects based on the
[None].
Dependencies: FDP_ACC.1 Subset access control
FMT_MSA.3 Static attribute initialisation
Notes: None.
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5.2.5 Device access control
5.2.5.1 FIA_AFL.1 Authentication failure handling
Hierarchical to: No other components.
FIA_AFL.1.1 The TSF shall detect when [an Enterprise Administrator configurable
positive integer within [1 through 4294967295]] unsuccessful
authentication attempts occur related to [Mobile Device Authentication].
FIA_AFL.1.2 When the defined number of unsuccessful authentication attempts has
been met or surpassed, the TSF shall [perform a local wipe of all TSF
and user data].
Dependencies: FIA_UAU.1 Timing of authentication
Notes: The Enterprise Administrator has the ability to configure the device to
perform a secure wipe of the device once the threshold for unsuccessful
device authentication attempts has been met. This is configurable
through the Exchange ActiveSync Mailbox Policy.
5.2.5.2 FIA_ATD.1 User attribute definition
Hierarchical to: No components.
FIA_ATD.1.1 The TSF shall maintain the following list of security attributes belonging to
individual Mobile Device users: [
a) Mobile Device Identifier,
b) Mobile Device User Authentication Data,
c) Enterprise User Identifier,
d) Exchange Authentication Data,
e) Exchange Server Address, and
f) Email address].
Dependencies: No dependencies.
Notes: As Windows Mobile 5.0 MSFP is a single-user operating system there is
no concept of a user identifier. However, the TOE does maintain the
Exchange User Identifier for the Mobile User.
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5.2.5.3 FIA_SOS.1 Verification of secrets
Hierarchical to: No other components.
FIA_SOS.1.1 The TSF shall provide a mechanism to verify that secrets meet the
following quality checks for Mobile Device User Authentication:[
a) must include both alpha and numeric characters,
b) must not contain a repeating predictable sequence,
c) must contain a configurable minimum number of characters
(as specified by the Enterprise Administrator), and
d) must be different from a configurable number of previous
passwords (as specified by the Enterprise Administrator)].
Dependencies: No dependencies.
Notes: While the TOE has the mechanisms to implement the above quality
checks for secrets, these settings are configurable by the Enterprise
Administrator and must be specified in the Exchange ActiveSync Mailbox
Policy.
The Windows Mobile 5.0 MSFP Installation and Administrator Guide (Ref.
[2]) includes details for establishing the appropriate Exchange ActiveSync
Mailbox Policy.
5.2.5.4 FIA_UAU.1 Timing of authentication
Hierarchical to: No other components.
FIA_UAU.1.1 The TSF shall allow [the
a) display of message status,
b) display of missed call status,
c) display of time/date information,
d) display of Mobile Device status information,
e) display of Mobile User information,
f) display of notifications,
g) conduct of an emergency call,
h) receipt of an incoming call,
i) receipt of an incoming text message, and
j) receipt of the Remote Wipe Command from the Exchange
Server]
on behalf of the user to be performed before the user is authenticated.
FIA_UAU.1.2 The TSF shall require each user to be successfully authenticated before
allowing any other TSF-mediated actions on behalf of that user.
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Dependencies: FIA_UID.1 Timing of identification
Notes: The TOE must be capable of presenting status details and to perform a
number of communications without an active user session.
5.2.5.5 FIA_UAU.7 Protected authentication feedback
Hierarchical to: No other components.
FIA_UAU.7.1 The TSF shall provide only [
a) a single asterix (*) per authentication character typed;
b) the number of incorrect authentication attempts;
c) a prompt to enter a confirmation string, after an Enterprise
Administrator configurable number of missed authentication
attempts; and
d) a warning for the last possible authentication attempt prior
to device wipe]
to the user while the authentication is in progress.
Dependencies: FIA_UAU.1 Timing of authentication
Notes: The prompting for the entry of a confirmation string after a number of
failed attempts is designed to prevent the device from being accidentally
wiped by inadvertent key presses.
The correct entry of the confirmation string is not considered to be a
correct authentication attempt nor is the incorrect entry of the string
considered a failed authentication attempt.
5.2.5.6 FTA_SSL.1-EX TSF-initiated session locking
Hierarchical to: No other components.
FTA_SSL.1-EX.1 The TSF shall lock an interactive session after [a period of inactivity
specified by the Enterprise Administrator through the Exchange
ActiveSync Mailbox Policy] by:
a) locking the display and only displaying notifications and/or status
information permitted by FIA_UAU.1, and
b) disabling any activity of the current user session other than
activities permitted by FIA_UAU.1 and unlocking the session.
FTA_SSL.1-EX.2 The TSF shall require the following events to occur prior to unlocking the
session: [successful Mobile Device Authentication].
Dependencies: FIA_UAU.1 Timing of authentication
Notes: This setting is configurable by the Enterprise Administrator and is
specified through the Exchange ActiveSync Mailbox Policy.
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5.2.5.7 FTA_SSL.2-EX User-initiated locking
Hierarchical to: No other components.
FTA_SSL.2-EX.1 The TSF shall allow user-initiated locking of the user's own interactive
session, by:
a) locking the display and only displaying notifications and/or status
information permitted by FIA_UAU.1, and
b) disabling any activity of the current user session other than
activities permitted by FIA_UAU.1 and unlocking the session.
FTA_SSL.2-EX.2 The TSF shall require the following events to occur prior to unlocking the
session: [successful Mobile Device Authentication].
Dependencies: FIA_UAU.1 Timing of authentication
Notes: None.
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5.2.6 Device security management
5.2.6.1 FMT_MOF.1a Management of security functions behaviour (Device Data
Protection)
Hierarchical to: No other components.
FMT_MOF.1a.1 The TSF shall restrict the ability to [enable, disable or modify the
behaviour of] the functions [related to managing the Device Data
Protection function] to [Manager (SECROLE_MANAGER)].
Dependencies: FMT_SMR.1 Security roles
FMT_SMF.1 Specification of Management Functions
Notes: This SFR was used in preference to FMT_MSA.1 as it better reflects TOE
functionality.
5.2.6.2 FMT_MSA.1a Management of security attributes (Device Application Control
SFP)
Hierarchical to: No other components.
FMT_MSA.1a.1 The TSF shall enforce the [Device Application Control SFP] to restrict
the ability to [query] the security attributes [
a) Developer name,
b) Digital signature, and
c) Device resource type
] to [Manager (SECROLE_MANAGER)].
Dependencies: [FDP_ACC.1 Subset access control,
FDP_IFC.1 Subset information flow control]
FMT_SMR.1 Security roles
FMT_SMF.1 Specification of Management Functions
Notes: None.
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5.2.6.3 FMT_MSA.1b Management of security attributes (Secure Enterprise Access SFP)
Hierarchical to: No other components.
FMT_MSA.1b.1 The TSF shall enforce the [Secure Enterprise Access SFP] to restrict
the ability to [modify] the security attributes [Root (system) certificate
store] to [Manager (SECROLE_MANAGER)].
Dependencies: [FDP_ACC.1 Subset access control, or
FDP_IFC.1 Subset information flow control]
FMT_SMR.1 Security roles
FMT_SMF.1 Specification of Management Functions
Notes: None.
5.2.6.4 FMT_MSA.1c Management of security attributes (Device Configuration Control
SFP)
Hierarchical to: No other components.
FMT_MSA.1c.1 The TSF shall enforce the [Device Configuration Control SFP] to
restrict the ability to [query or modify] the security attributes [
a) Security role, and
b) Access privilege
] to [Manager (SECROLE_MANAGER)].
Dependencies: [FDP_ACC.1 Subset access control, or
FDP_IFC.1 Subset information flow control]
FMT_SMR.1 Security roles
FMT_SMF.1 Specification of Management Functions
Notes: None.
5.2.6.5 FMT_MOF.1b Management of security functions behaviour (Device Access
Control)
Hierarchical to: No other components.
FMT_MOF.1b.1 The TSF shall restrict the ability to [enable, disable or modify the
behaviour of] the functions [related to managing the Device Access
Control function] to [Manager (SECROLE_MANAGER)].
Dependencies: FMT_SMR.1 Security roles
FMT_SMF.1 Specification of Management Functions
Notes: This SFR was used in preference to FMT_MSA.1 as it better reflects TOE
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functionality.
5.2.6.6 FMT_MSA.2 Secure security attributes
Hierarchical to: No other components.
FMT_MSA.2.1 The TSF shall ensure that only secure values are accepted for security
attributes.
Dependencies: ADV_SPM.1 Informal TOE security policy model
[FDP_ACC.1 Subset access control, or
FDP_IFC.1 Subset information flow control]
FMT_MSA.1 Management of security attributes
FMT_SMR.1 Security roles
Notes: None.
5.2.6.7 FMT_MSA.3a Static attribute initialisation (Device Application Control SFP)
Hierarchical to: No other components.
FMT_MSA.3a.1 The TSF shall enforce the [Device Application Control SFP] to provide
[restrictive] default values for security attributes that are used to enforce
the SFP.
FMT_MSA.3a.2 The TSF shall allow the [Manager (SECROLE_MANAGER)] to specify
alternative initial values to override the default values when an object or
information is created.
Dependencies: FMT_MSA.1 Management of security attributes
FMT_SMR.1 Security roles
Notes: None.
5.2.6.8 FMT_MSA.3b Static attribute initialisation (Secure Enterprise Access SFP)
Hierarchical to: No other components.
FMT_MSA.3b.1 The TSF shall enforce the [Secure Enterprise Access SFP] to provide
[restrictive] default values for security attributes that are used to enforce
the SFP.
FMT_MSA.3b.2 The TSF shall allow the [Enterprise (SECROLE_ENTERPRISE)] to
specify alternative initial values to override the default values when an
object or information is created.
Dependencies: FMT_MSA.1 Management of security attributes
FMT_SMR.1 Security roles
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Notes: None.
5.2.6.9 FMT_MSA.3c Static attribute initialisation (Device Configuration Control SFP)
Hierarchical to: No other components.
FMT_MSA.3c.1 The TSF shall enforce the [Device Configuration Control SFP] to
provide [restrictive] default values for security attributes that are used to
enforce the SFP.
FMT_MSA.3c.2 The TSF shall allow the [Manager (SECROLE_MANAGER)] to specify
alternative initial values to override the default values when an object or
information is created.
Dependencies: FMT_MSA.1 Management of security attributes
FMT_SMR.1 Security roles
Notes: None.
5.2.6.10 FMT_SMF.1 Specification of management functions
Hierarchical to: No other components.
FMT_SMF.1.1 The TSF shall be capable of performing the following security
management functions: [
a) manage device data protection,
b) manage device application control,
c) manage secure enterprise access,
d) manage device configuration control, and
e) manage device access control].
Dependencies: No dependencies.
Notes: The TOE provides the capability to manage each of the TOE security
functions.
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5.2.6.11 FMT_SMR.1 Security roles
Hierarchical to: No other components.
FMT_SMR.1.1 The TSF shall maintain the roles [
a) None (SECROLE_NONE)
b) Manufacturer (SECROLE_OEM)
c) Operator (SECROLE_OPERATOR)
d) Manager (SECROLE_MANAGER)
e) Authenticated User (SECROLE_USER_AUTH)
f) Unauthenticated User (SECROLE_USER_UNAUTH)
g) Trusted Provisioning Server (SECROLE_OPERATOR_TPS)
h) Known Push Proxy Gateway (SECROLE_KNOWN_PPG)
i) Device Trusted Push Proxy Gateway
(SECROLE_TRUSTED_PPG)
j) Push Initiator Authenticated (SECROLE_PPG_AUTH)
k) Trusted Push Proxy Gateway (SECROLE_PPG_TRUSTED)
l) Enterprise (SECROLE_ENTERPRISE)].
FMT_SMR.1.2 The TSF shall be able to associate users with roles.
Dependencies: FIA_UID.1 Timing of identification
Notes: The Windows Mobile security roles allow or restrict access to the Mobile
Device resources. Roles are used to determine whether a remote
message is accepted, and if it is, what level of access it is allowed.
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5.3 TOE Security Assurance Requirements
36 The assurance package for the evaluation of Windows Mobile 5.0 MSFP is
Evaluation Assurance Level 2 (EAL2), augmented by the life cycle support
component that provides basic flaw remediation (ALC_FLR.1).
37 EAL2 assurance requirements provide confidence in the security functionality of the
TOE by analysis using a functional and interface specification, guidance
documentation and the high-level design of the TOE, to understand the security
behavior.
38 The analysis is supported by independent testing of the TOE security functions,
evidence of developer testing based on the functional specification, selective
independent confirmation of the developer test results, strength of function analysis,
and evidence of a developer search for obvious vulnerabilities.
39 EAL2 also provides assurance through a configuration list for the TOE, and evidence
of secure delivery procedures.
40 Table 10 below provides a summary of the TOE security assurance requirements for
this evaluation. Complete details of all assurance components are located in part 3
of the Common Criteria.
Table 10 – Summary of TOE security assurance requirements
Assurance class Assurance components
ACM: Configuration management ACM_CAP.2 Configuration items
ADO_DEL.1 Delivery procedures
ADO: Delivery and operation
ADO_IGS.1 Installation, generation, and start-up procedures
ADV_FSP.1 Informal functional specification
ADV_HLD.1 Descriptive high-level design
ADV: Development
ADV_RCR.1 Informal correspondence demonstration
AGD_ADM.1 Administrator guidance
AGD: Guidance documents
AGD_USR.1 User guidance
ALC: Life cycle support ALC_FLR.1 Basic flaw remediation
ATE_COV.1 Evidence of coverage
ATE_FUN.1 Functional testing
ATE: Tests
ATE_IND.2 Independent testing – sample
AVA_SOF.1 Strength of TOE security function evaluation
AVA: Vulnerability assessment
AVA_VLA.1 Developer vulnerability analysis
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5.4 Security Requirements for the IT Environment
41 This section specifies the security requirements that are to be provided by the IT
environment to support the TOE and the security objectives on the IT environment.
Table 11 provides a summary of the IT security functions relevant to the IT
environment.
42 The IT environment needs to provide the following supporting functionality:
a) Identification and Authentication. The TOE relies on Active Directory to
authenticate Mobile Users when using Exchange ActiveSync to access their
enterprise mailbox and associated Exchange Mailbox Items.
b) Communications Security. The TOE communicates securely with the
enterprise using SSL/TLS to support a secure communications channel over
Exchange ActiveSync.
c) Security management. The environment must provide both the Enterprise
Administrator and the Mobile Operator roles to support the secure
management and configuration of the TOE.
Table 11 – Summary of IT environment security functional requirements
Identifier Title
FCS: Cryptographic support
FCS_CKM.1 Cryptographic key generation
FCS_COP.1 Cryptographic operation (SSL/TLS)
FCS_CKM.4 Cryptographic key destruction
FIA: Identification and Authentication
FIA_UAU.2 User authentication before any action
FIA_UID.2 User identification before any action
FIA_ATD.1 User attribute definition
FMT: Security management
FMT_MOF.1a Management of security functions behaviour (Enterprise)
FMT_MOF.1b Management of security functions behaviour (Operator)
FMT_SMF.1 Specification of management functions
FMT_SMR.1 Security roles
FTP: Trusted path/channels
FTP_ITC.1 Inter-TSF trusted channel
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5.4.1 FCS: Cryptographic support
5.4.1.1 FCS_CKM.1 Cryptographic key generation
Hierarchical to: No other components.
FCS_CKM.1.1 The IT environment shall generate cryptographic keys in accordance
with a specified cryptographic key generation algorithm [
a) RSA, and
b) 3DES]
and specified cryptographic key sizes [
a) 384 through to a maximum 16384 bits (RSA), and
b) 168 bits (3DES)]
that meet the following: [
a) RFC 2437 “PKCS #1: RSA Cryptography Specifications
Version 2.0”, October 1998; and
b) Federal Information Processing Standard (FIPS) Publication
46-3, “Data Encryption Standard”, 25 October 1999].
Dependencies: [FCS_CKM.2 Cryptographic key distribution, or
FCS_COP.1 Cryptographic operation]
FCS_CKM.4 Cryptographic key destruction
FMT_MSA.2 Secure security attributes
Notes: None.
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5.4.1.2 FCS_COP.1 Cryptographic operation (SSL/TLS)
Hierarchical to: No other components.
FCS_COP.1.1 The IT environment shall perform [encryption, decryption and digital
signature functions for Exchange ActiveSync and Trusted
Provisioning communications] in accordance with a specified
cryptographic algorithm [
a) RSA,
b) 3DES, and
c) SHA-1
] and cryptographic key sizes [
a) 384 through to a maximum of 16384 bits (RSA),
b) 168 bits (3DES), and
c) N/A (SHA-1)
] that meet the following: [
a) RFC 2437 “PKCS #1: RSA Cryptography Specifications
Version 2.0”, October 1998;
b) Federal Information Processing Standard (FIPS) Publication
46-3, “Data Encryption Standard”, 25 October 1999; and
c) Federal Information Processing Standard (FIPS) Publication
180-1, “Secure Hash Algorithm”, 17 April 1995].
Dependencies: [FDP_ITC.1 Import of user data without security attributes, or
FDP_ITC.2 Import of user data with security attributes, or
FCS_CKM.1 Cryptographic key generation]
FCS_CKM.4 Cryptographic key destruction
FMT_MSA.2 Secure security attributes
Notes: None.
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5.4.1.3 FCS_CKM.4 Cryptographic key destruction
Hierarchical to: No other components.
FCS_CKM.4.1 The IT environment shall destroy cryptographic keys in accordance with
a specified cryptographic key destruction method [zeroization] that meets
the following: [FIPS 140-1 or 140-2 Level 1].
Dependencies [FDP_ITC.1 Import of user data without security attributes, or
FDP_ITC.2 Import of user data with security attributes, or
FCS_CKM.1 Cryptographic key generation]
FMT_MSA.2 Secure security attributes
Notes: None.
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5.4.2 FIA: Identification and Authentication
5.4.2.1 FIA_UAU.2 User authentication before any action
Hierarchical to: FIA_UAU.1 Timing of authentication.
FIA_UAU.2.1 The IT environment shall require each user to be successfully
authenticated before allowing any TSF-mediated actions on behalf of that
user.
Dependencies FIA_UID.1 Timing of Identification
Notes: To authenticate a user when accessing an enterprise mailbox, the Mobile
Device passes the cached user’s enterprise credentials to the Exchange
Server, which authenticates the user against the Active Directory.
5.4.2.2 FIA_UID.2 User identification before any action
Hierarchical to: FIA_UID.1 Timing of identification
FIA_UID.2.1 The IT environment shall require each user to identify itself before
allowing any TSF-mediated actions on behalf of that user.
Dependencies No dependencies.
Notes: See notes for FIA_UAU.2.
5.4.2.3 FIA_ATD.1 User attribute definition
Hierarchical to: No other components.
FIA_ATD.1.1 The IT environment shall maintain the following list of security attributes
belonging to individual users: [
a) Enterprise User Identifier,
b) Group Memberships,
c) Mailbox,
d) Enterprise Authentication Data,
e) Private Keys, and
f) Privileges].
Dependencies No dependencies.
Notes: None.
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5.4.3 FMT: Security management
5.4.3.1 FMT_MOF.1a Management of security functions behaviour (Enterprise)
Hierarchical to: No other components.
FMT_MOF.1a.1 The IT environment shall restrict the ability to [enable, disable or
modify the behaviour of] the functions [
a) generate and send Exchange ActiveSync Mailbox Policy,
b) generate and send Exchange Commands, and
] to [Enterprise (SECROLE_ENTERPRISE)].
Dependencies: FMT_SMR.1 Security roles
FMT_SMF.1 Specification of Management Functions
Notes: None.
5.4.3.2 FMT_MOF.1b Management of security functions behaviour (Operator)
Hierarchical to: No other components.
FMT_MOF.1b.1 The IT environment shall restrict the ability to [enable, disable or
modify the behaviour of] the functions [generate and send XML
Provisioning Documents] to [Operator (SECROLE_OPERATOR)].
Dependencies: FMT_SMR.1 Security roles
FMT_SMF.1 Specification of Management Functions
Notes: None.
5.4.3.3 FMT_SMF.1 Specification of management functions
Hierarchical to: No other components.
FMT_SMF.1.1 The IT environment shall be capable of performing the following security
management functions: [
a) generate and send Exchange ActiveSync Mailbox Policy
(Enterprise),
b) generate and send Exchange Commands (Operator), and
c) generate and send XML Provisioning Documents (Operator
or Enterprise)].
Dependencies: No dependencies.
Notes: The IT environment provides the capability to set and establish enterprise
policy that can be applied to the device through Exchange ActiveSync or
OMA-DM and secure provisioning protocols.
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5.4.3.4 FMT_SMR.1 Security roles
Hierarchical to: No other components.
FMT_SMR.1.1 The IT environment shall maintain the roles [
a) Enterprise (SECROLE_ENTERPRISE)
b) Operator (SECROLE_OPERATOR)]
FMT_SMR.1.2 The IT environment shall be able to associate users with roles.
Dependencies: FIA_UID.1 Timing of identification
Notes: The enterprise environment provides the Enterprise Administrator role
and the operator environment provides the Mobile Operator role.
5.4.4 FTP: Trusted path/channel
5.4.4.1 FTP_ITC.1 Inter-TSF trusted channel
Hierarchical to: No other components.
FTP_ITC.1.1 The IT environment shall provide a communication channel between
itself and a remote trusted IT product that is logically distinct from other
communication channels and provides assured identification of its end
points and protection of the channel data from modification or disclosure.
FTP_ITC.1.2 The IT environment shall permit [the TSF or the remote trusted IT
product] to initiate communication via the trusted channel.
FTP_ITC.1.3 The IT environment shall initiate communication via the trusted channel
for [
a) applying Exchange ActiveSync Mailbox Policy, and
b) sending Exchange Commands].
Dependencies: No dependencies.
Notes: This SFR provides the enterprise-side of the trusted channel between the
Mobile Device and a remote trusted IT product.
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6 TOE Summary Specification
6.1 Overview
43 This chapter provides the TOE summary specification, a high-level definition of the
security functions claimed to meet the functional and assurance requirements.
6.2 Security Functions
44 The TOE security functions include the following:
a) Device data protection. The TOE provides the capability to protect data in
transit.
b) Device application control. The TOE provides the capability to only permit
trusted applications to be installed and executed on the Mobile Device.
c) Secure enterprise access. The TOE provides the capability to securely
synchronize data items with the Mobile User’s Exchange Mailbox.
d) Device configuration control. The TOE provides the capability to protect
against modification by un-trusted systems.
e) Device access control. The TOE has inbuilt security mechanisms that can
be enabled to provide controlled access to the Mobile Device.
f) Device security management. The TOE has configurable security policies
that establish which actions a user or application may take.
6.2.1 Device data protection
6.2.1.1 SSL/TLS channel encryption
45 Enterprise Administrator can allow, or require, Windows Mobile-powered devices to
create SSL/TLS encrypted connections with the Enterprise Exchange Server. By
default, SSL/TLS encrypted connections are 128-bit.
46 SSL/TLS includes a method for a client and server to negotiate an encryption
algorithm and strength; this is designed to allow an arbitrary client-server pair to find
the strongest encryption that both endpoints support. Both Windows Mobile and the
Windows Server Internet Information Services (IIS) application server can take
advantage of a broad set of cryptographic algorithms for use with SSL/TLS.
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6.2.1.2 Certified cryptographic module
47 Windows Mobile offers the following cryptographic services:
a) Encryption. Provides confidentiality and authentication between two
communicating parties who have exchanged a shared secret.
b) Hashing. Provides data integrity of information when sent over a non-secure
channel such as the Internet and to protect user credentials on the device.
c) Digital Signature. Provides authentication of another party, or information
sent by that party, without prior exchange of a shared secret.
48 Windows Mobile implements these cryptographic services through the Microsoft
Windows CE and Windows Mobile Enhanced Cryptographic Provider (RSAENH).
This is a general-purpose, software-based, cryptographic module for Windows CE
and Windows Mobile. This module encapsulates several different cryptographic
algorithms which are accessible via the Microsoft CryptoAPI. It can be dynamically
linked into applications by software developers to permit the use of general-purpose
cryptography.
49 The RSAENH cryptographic module meets the Level 1 FIPS 140-2 Validation
requirements.
50 The RSAENH cryptographic module consists of a single dynamically-linked library
(DLL) named RSAENH.DLL. The cryptographic boundary for RSAENH is defined as
the enclosure of the computer system on which the cryptographic module is to be
executed. The physical configuration of the module, as defined in FIPS PUB 140-2,
is Multi-Chip Standalone.
51 The RSAENH cryptographic module supports the following FIPS 140-2 Approved
algorithms:
a) RSA PKCS #1 (v1.5) / X9.31 sign and verify with private and public key,
b) DES keypair derivation,
c) DES keypair generation,
d) DES ECB / CBC encrypt/decrypt,
e) 3DES keypair derivation,
f) 3DES keypair generation,
g) 3DES ECB / CBC encrypt/decrypt,
h) 3DES 112 keypair generation,
i) 3DES 112 ECB / CBC encrypt/decrypt,
j) SHA-1 hash,
k) SHA-256, SHA-384, SHA-512,
l) SHA-1 based Keyed-Hash Message Authentication Code (HMAC),
m) SHA-2 based Keyed-Hash Message Authentication Code (HMAC), includes
HMAC-SHA-256, HMAC-SHA-384, HMAC-SHA-512, and
n) Approved Software Pseudo Random Number Generation (PRNG) (seeded by
non-Approved PRNG) (FIPS 186-2, Appendix 3.1 and 3.3, Regular, XOriginal,
SHA-1 G function, Seed-key 64 bytes only).
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6.2.2 Device application control
6.2.2.1 Controlled application installation
52 Application installation files (known as cabinet or .cab files) may be digitally signed
by the application provider (Microsoft), a third-party software company, or the
developer of an enterprise line-of-business application. At install time, the digital
signature of the installation .cab is checked against certificates in the software
publishing certificate store. If there is a match, the installation can take place.
53 The installer calls the Security Loader, which checks the digital signature of the .cab
against the certificates in the Software Publishing Certificate (SPC) store to
determine the security role used for the configuration.
54 The Security Loader also checks that the application revocation list does not include
the certificate hashes (a certificate hash is a digest of the certificate data) and that
the application revocation list does not include the .cab file hashes.
6.2.2.2 Controlled application execution
55 Digital certificates are used on Windows Mobile device to provide the basis for
implementing code execution control. When an application attempts to execute on
Windows Mobile, the Kernel will call the Security Loader to determine if the
application is permitted.
56 Applications signed with a trusted certificate are permitted to execute. Unsigned
applications, or those signed with a certificate that the Mobile Device does not
recognize, require further policy checks to determine if they can run.
6.2.3 Secure enterprise access
6.2.3.1 Secure channel
57 The Exchange Server mobile messaging features are implemented using the
Exchange ActiveSync (EAS) protocol, which consists of two separate components.
The EAS server component is included as part of the Exchange Server installation
process. The EAS client component is included with Windows Mobile.
58 Windows Mobile software supports Microsoft Exchange ActiveSync features that can
create a protected connection to the corporate Microsoft Exchange Server. With
Exchange ActiveSync, the Mobile Device must establish a secure channel with the
Exchange Server to ensure that both TSF and user data can pass in a secure
manner.
59 In the Windows Mobile security architecture, SSL/TLS plays an important role in
protecting device communications. The preferred method for establishing Exchange
ActiveSync connections requires the use of SSL/TLS to encrypt the connection
between the Mobile Device and the Enterprise Exchange Server.
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6.2.3.2 Synchronization of Mailbox Items
60 Mobile Users can access their corporate Mailbox on the Enterprise Exchange Server
by using Exchange ActiveSync, which allows the sending and receipt of e-mail,
calendar, contact, and task data through Exchange Servers on the corporate
network. Exchange ActiveSync connections are protected with 128-bit SSL/TLS
encryption.
61 With Exchange ActiveSync, e-mail, calendar information, and other Exchange Items
such as contacts and tasks, can be accessed quickly from off-site locations.
62 Synchronization can be set to occur automatically from as often as every five
minutes to as seldom as every four hours, or even to only occur when manually
invoked. Alternatively, synchronization can be set to occur when a new message
arrives at the Exchange Server.
6.2.4 Device configuration control
6.2.4.1 Exchange ActiveSync Mailbox Policy
63 The Enterprise Administrator has the ability to enforce password and device
configuration policies on the Mobile Device through the Exchange Management
Console.
64 Exchange Server has the capability to create security policies that are delivered to
the Mobile Device through Exchange ActiveSync. The device implements the policy
and takes action when it receives the policy information from the server. Different
devices have differing levels of support for Exchange ActiveSync policies, which can
specify several aspects of device security:
a) Whether or not a device must be locked with a password.
b) The minimum length of the password.
c) Whether the password can be numeric-only or alphanumeric.
d) Whether failed password entry attempts should trigger a local device wipe.
65 When a Mobile Device security policy is defined, it is automatically sent to each
device the next time that device starts synchronization. The Mobile User can choose
to accept or decline the policy. However, the Enterprise Administrator can specify
whether devices that reject the policy (or that don’t implement it) may still connect.
66 The Enterprise Administrator may also define a list of Mobile Users who are exempt
from security policy controls. This is useful for exempting users with special
requirements, or whose devices don’t completely implement the client-side
Exchange ActiveSync capabilities.
6.2.4.2 Trusted provisioning
67 Windows Mobile supports Open Mobile Alliance Device Management (OMA DM).
The DM client in the device supports the following security features:
a) Secure transport over SSL/TLS.
b) Device management application level client authentication.
c) Device management application level server authentication.
d) Authenticating server notification trigger.
e) Windows Mobile security role-based access control.
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68 Windows Mobile-powered devices can be managed by using XML-based
provisioning documents to configure operating system and application settings,
including security settings. These provisioning documents can be applied to multiple
Mobile Devices. The XML provisioning documents are distributed through:
a) Over-the-air synchronizations with a device management server on the
network. This server could be Microsoft Systems Management Server (SMS),
Exchange, a third-party device management solution, or a device
management server operated by a Mobile Operator.
b) Deployment in a cabinet provisioning format file (.cpf). Application
installation files are known as cabinet files (.cab); the .cpf file is a special type
of cabinet file that contains the XML provisioning document. The device can
download the .cpf file from a provisioning server or from an attached desktop.
69 For large deployments of Windows Mobile-powered devices, the XML provisioning
not only reduces deployment efforts, but also helps standardize security settings.
Along with security settings, XML provisioning allows Enterprise Administrators to
create a standard configuration for Mobile Devices, including wireless and other
network settings, Internet connection, and e-mail synchronization settings.
6.2.4.3 Local configuration control
70 The TOE can be configured locally by the authenticated Mobile User so that
Bluetooth, Infrared, SMS, MMS and Wi-Fi communications can be enabled or
disabled.
71 Through the device security policies, and locally, through the control panel, the
Mobile User is capable of disabling and enabling specific communications methods
and ensuring that all communications are expressly permitted.
6.2.5 Device access control
6.2.5.1 Device authentication and lock
72 Device lock requires a password to access the device when it is turned on; however,
it is possible to receive incoming calls and to make emergency calls without
authenticating to the device.
73 The TOE enables a user to interact directly through the User Interface (UI) and lock
a current session. To unlock a device the Mobile User will have to successfully
authenticate using their password.
74 The TOE supports the implementation of robust password policies for local
authentication to the Mobile Device. The Microsoft Default Local Authentication Plug-
in (LAP) can be configured to prevent users from choosing a password that contains
a simple pattern or has too few digits.
75 The feature will enable a policy that requires end users to choose a password that
does not contain:
a) a repeating sequence (such as 1111), and
b) a sequence with a predictable difference between values (such as 1234 or
1357).
76 The Microsoft default LAP allows Enterprise Administrator to enforce a policy of how
often a user must choose a new password. The password expiration feature is
dependent on the phone clock. Once the expiration period is reached the user is
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prompted to change their password. The new password must meet the other
requirements such as password strength and password history
6.2.5.2 Local device wipe
77 Local device wipes are triggered on a Mobile Device with device lock enforced if a
user incorrectly enters a password more than a specified number of times (the policy
default is 8 times, but the administrator can adjust this value).
78 After a configurable number of missed attempts, the device displays a confirmation
prompt that requires the user to type a confirmation string (the default is “A1B2C3”)
to continue. This prevents the device from being wiped by accidental key presses.
Once the password retry limit is reached, the device immediately wipes itself,
erasing all local data.
79 Only data located on the mobile device will be wiped. Any data stored on an inserted
removable storage card will not be wiped.
6.2.6 Device security management
6.2.6.1 Security roles
80 The TOE maintains multiple management roles which determine an individual’s
degree of access to device resources.
81 Security roles determine access to Windows Mobile powered device resources. The
security role is based on the message origin and how the message is signed.
Security roles are also used with certificates to enforce security settings that are
configured by using security policies.
82 The TOE implements several roles however, some of the key roles are as follows:
a) Manager (SECROLE_MANAGER). This role allows unrestricted access to
system resources.
b) Enterprise (SECROLE_ENTERPRISE). Allocated to the Exchange
Administrator role, or known as the Enterprise Administrator in the context of
the TOE. The Enterprise role allows IT administrators to manage specific
device settings, such as wiping a device, setting password requirements, and
managing certificates.
c) Operator (SECROLE_OPERATOR). Setting can be changed by a Wireless
Application Protocol (WAP) Trusted Provisioning Server (TPS). Known as the
Mobile Operator in the context of the TOE.
d) Authenticated User (SECROLE_USER_AUTH). Setting can be changed by
an authenticated user. This role can be assigned to the Mobile User.
6.2.6.2 Security policies
83 The TOE can be configured through specific security policies to only accept certain
over the air (OTA) provisioning protocols and messages.
84 Security policies are used for configuring security settings that are then enforced
with the help of security roles and certificates. They provide the flexibility to control
the level of security on the device. The policies are defined globally and enforced
locally in their respective components.
85 The security policy is set during boot by executing a configuration file called
provxml.provxml. This provisioning file is in ROM and it contains the default setting
specified by the device manufacturer.
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86 The security policies are loaded onto Windows Mobile powered devices in a security
policy provisioning document, which is an Extensible Markup Language (XML) file
that is assigned the correct security role to apply the security settings to the device.
These security policies are enforced at critical points across the architecture of the
device. Often, these policies will interact with Configuration Manager and the
security settings of the Mobile Device. When the security policy document is
delivered to the device, it is validated and verified by the security policy engine of the
TOE, which is administered by Configuration Manager, and then applied by the
Security Policy Configuration Service Provider.
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6.2.6.3 Remote wipe
87 Remote wipes occur when the Enterprise Administrator issues an explicit wipe
command through the Exchange Management Console. The Mobile User can also
initiate a wipe command if they've lost their device. Remote wipe operations are
separate from local wipes, and a device can be wiped remotely even if Exchange
ActiveSync security policies are not in force. The wipe command is pushed as an
out-of-band command, so that the device receives it on its next synchronization. The
device sends an acknowledgement message when it receives the wipe command,
alerting the Enterprise Administrator that the wipe has occurred. The Mobile User
cannot opt out of the remote wipe.
88 Wiping the device has the effect of performing a factory or “hard” reset; all programs,
data, and user-specific settings are removed from the device. The Windows Mobile
device wipe implementation wipes all data, settings, and private key material on the
device by overwriting the device memory with a fixed bit pattern, greatly increasing
the difficulty of recovering data from a wiped device.
89 Only data located on the mobile device will be wiped. Any data stored on an inserted
removable storage card will not be wiped.
6.3 Strength of Function claim
90 SOF claims are made for all permutational or probabilistic mechanisms that are non-
cryptographic in nature. Device authentication and lock is the only
permutational/probabilistic mechanism implemented in the TOE.
91 The SOF claim for the device authentication and lock mechanism is SOF-basic.
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6.4 Assurance Measures
92 The following groups of assurance measures are applied to Windows Mobile to
satisfy CC EAL2 augmented with flaw remediation:
a) configuration management,
b) delivery and operation,
c) development,
d) guidance documents,
e) life cycle support,
f) tests, and
g) vulnerability assessment.
6.4.1 Configuration management
93 The Configuration Management (CM) measures applied by Microsoft ensure that
Configuration Items (CIs) are uniquely identified, and that documented procedures
are used to control and track changes that are made to the TOE.
94 Microsoft ensures changes to the implementation representation are controlled with
the support of automated tools and that TOE associated CI modifications are
properly controlled. Microsoft performs CM on the TOE implementation
representation, design, tests, user and administrator guidance, the CM
documentation, lifecycle documentation and vulnerability analysis.
95 Microsoft ensures that the TOE is uniquely referenced and labeled with its own
reference. Microsoft uses, and documents how they use, automated tools to support
TOE generation.
96 These activities are documented in the Windows Mobile 5.0 MSFP & 6 Configuration
Management Documentation.
6.4.2 Delivery and operation
97 Microsoft provides delivery documentation and procedures to identify the TOE, allow
detection of unauthorized modifications of the TOE and installation and generation
instructions at start-up.
98 Microsoft’s delivery procedures describe the electronic and non-electronic
procedures to be used to detect modification to the TOE. The installation and
generation procedures describe the steps necessary to place Windows Mobile and
the device into the evaluated configuration.
99 Delivery procedures are documented in the Windows Mobile 5.0 MSFP & 6 Delivery
Process.
100 Installation, generation and start-up information is contained in the Windows Mobile
5.0 MSFP Installation and Administrator Guide.
6.4.3 Development
101 The Windows Mobile Security Design Documentation provides the suite of
documents that provide the various security design layers of the TOE. These
documents include the following:
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a) Windows Mobile 5.0 MSFP Functional Specification. The functional
specification describes the security functionality of the TOE, and aligns with
the security functional requirements specified in the ST. The functional
specification also details the external interface to the TOE.
b) Windows Mobile 5.0 MSFP High-Level Design. The high-level design of
Windows Mobile 5.0 MSFP provides a description of the TSF in terms of
subsystems and relates these units to the functions that they provide.
c) Windows Mobile 5.0 MSFP Correspondence Demonstration. This
document provides correspondence between the various representations
provided for the EAL2 evaluation.
6.4.4 Guidance documents
102 Microsoft provides administrator and user guidance on how to perform the TOE
security functions and warnings to authorized administrators and users about actions
that can compromise the security of the TOE.
103 Administrator guidance is documented in the Windows Mobile 5.0 MSFP Installation
and Administrator Guide.
104 User guidance is provided in help files contained on the Windows Mobile powered
device and is supplemented by the Windows Mobile 5.0 MSFP & 6 User Guide
Supplement.
6.4.5 Life cycle support
105 Microsoft applies procedures to accept and act upon reported security flaws.
Microsoft designates specific points of contact for user reports and security related
inquiries.
106 The procedures are documented and describe how security flaws are tracked and
that for each security flaw a description and status of the correction is provided.
107 The procedures ensure that all reported flaws are addressed by Microsoft and that
corrections do not introduce new flaws. The procedures also ensure a timely
response to reported flaws and the automatic distribution of reports to the affected
users.
108 These activities are documented in the Windows Mobile 5.0 MSFP & 6 Flaw
Remediation Process.
6.4.6 Tests
109 The TOE has been tested by Microsoft to ensure that all security functional
requirements have been implemented accurately within Windows Mobile.
110 The Windows Mobile 5.0 MSFP & 6 Security Testing document consists of the
following:
a) Test plan. The test plan describes the form, content, and organization of test
documentation. It also summarizes each of the test suites and includes high-
level procedures for exercising the tests.
b) Test procedures. The test procedures include both documentation and an
actual implemented test (if applicable). Test suites are organized around tests
that share a common theme. The test suite documentation describes the
purpose for the test suite, the set of test variations, procedures to successfully
exercise the test, and expected results.
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c) Test results. The results are captured for each test with summaries of the
results in terms of total tests for each test suite. The results are matched
against the expected results for each test.
6.4.7 Vulnerability assessment
111 Documented analysis of the strength of TSF has been created to support the SOF
claims for the TOE.
112 Microsoft has performed a vulnerability analysis of Windows Mobile to identify
weaknesses that can be exploited in the TOE. Microsoft documents the status of
identified vulnerabilities and demonstrates that for each vulnerability, the vulnerability
cannot be exploited in the intended environment and that the TOE is resistant to
obvious penetration attacks.
113 Strength of function analysis is provided in the Windows Mobile 5.0 MSFP & 6 SOF
Analysis document.
114 Vulnerability analysis is documented in the Windows Mobile 5.0 MSFP & 6
Vulnerability Assessment document.
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7 Rationale
7.1 Overview
115 This section provides the rationale for completeness and consistency of the ST. The
rationale addresses the following areas:
a) Security objectives rationale. Provides coverage for the security objectives
for the TOE and the environment, ensuring that all threats and assumptions
are effectively addressed.
b) Security requirements rationale. Provides justification for TOE assurance
requirements, evidence that all dependencies have been addressed,
specification of strength of function for all probabilistic mechanisms and
demonstration that the IT requirements address the TOE and environment
objectives.
c) TOE summary specification rationale. Provides evidence that the IT
security functions and assurance measures are adequate to implement the
security functional and assurance requirements.
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7.2 Security objectives rationale
7.2.1 Security objectives for the TOE
Table 12 – Mapping of TOE security objectives to threats
Threats Objective Justification
T.EAVESDROPPING O.COMMS_CONF The threat of eavesdropping is mitigated by
implementing mechanisms to preserve the
confidentiality of transmitted data.
T.INTERCEPT O.COMMS_INT The threat of interception is mitigated by
implementing mechanisms to preserve the integrity of
transmitted data.
T.IMPORT O.CODE_CTRL The threat of a compromise of data due to import of
malicious code is mitigated by requiring explicit
authorization to execute code.
T.TOE_ACCESS O.USER_AUTH
O.REMOTE_WIPE
O.LOCAL_WIPE
O.SESSION_LOCK
O.REMOTE_ADMIN
The threat of a data compromise due to a lost device
is mitigated by:
• O.USER_AUTH requires user authentication,
preventing immediate access to data.
• O.REMOTE_WIPE enables the Enterprise
Administrator to remotely erase device data,
reducing the time available to an attacker to
compromise data.
• O.LOCAL_WIPE allows the TOE to be
configured to erase device data after a
defined number of failed authentication
attempts, detecting and reacting to
authentication attacks.
• O.SESSION_LOCK ensures that the user
has to re-authenticate after a defined period
of inactivity, reducing the likelihood that an
attacker will gain possession of an ‘unlocked’
device.
• O.REMOTE_ADMIN enables the Enterprise
Administrator to apply remote wipe
commands.
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Threats Objective Justification
T.MASQUERADE O.MGMT_AUTH
O.ROLES
The threat of acting on spurious management
messages is mitigated by:
• O.MGMT_AUTH implementing mechanisms
to ensure all management messages have
originated from a trusted source.
• O.ROLES enables role base access control
to assign roles to messages and processes
from various sources and interfaces.
T.WEAK_SECRET O.SECRET
O.REMOTE_ADMIN
The threat that a user will chose a weak password is
mitigated by:
• O.SECRET implementing mechanisms to
detect and prevent the selection of weak
passwords.
• O.REMOTE_ADMIN ensures that the
Enterprise Administrator can apply strong
password policies to the device.
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7.2.2 Security objectives for the non-IT environment
Table 13 – Mapping of non-IT objectives to assumptions
Assumptions Objectives Justification
A.USAGE OE.USAGE This objective for the environment ensures that
the assumption is upheld that the Mobile Users
will be made aware of the need to follow
guidance, that the Mobile Device when
subjected to a hard-reset my not load into the
evaluated configuration and the device must be
re-provisioned into the evaluated configuration,
that the device must be only connected to
trusted computing devices for ActiveSync
sessions, and that it should be appropriately
protected when not in use.
A.DELIVERY OE.DELIVERY This objective for the environment ensures that
the assumption is upheld that the Device
Manufacturer and the Mobile Operator are
trusted to not modify the security enforcing
components of the TOE during the delivery
process.
A.IT_ENTERPRISE OE. IT_ENTERPRISE This objective for the environment ensures that
the assumption is upheld that the enterprise
components of the TOE in normal operating
conditions are appropriately protected.
A.IT_MOBILE OE.IT_MOBILE This objective for the environment ensures that
the assumption is upheld that the Trusted
Provisioning Server, bootstrapped to provision
the TOE, is protected.
A.ADMIN OE.ADMIN This objective for the environment upholds the
assumption that administration personnel can
be trusted.
A.OPERATOR OE.OPERATOR This objective for the environment ensures that
the assumption is upheld that the network
provider does not undermine the security
functionality of the TOE.
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7.2.3 Security objectives for the IT environment
Table 14 – Mapping of IT environment objectives to assumptions
Assumption Objective Justification
A.I&A_ENTERPRISE OE.I&A_ENTERPRISE This objective for the IT environment ensures
that the assumption is upheld that the user of
the Mobile Device will be authenticated by the
IT environment prior to being granted access to
their Mailbox or other corporate resources.
A.COMMS_ENT OE.COMMS_ENT This objective for the IT environment ensures
that the assumption is upheld that the enterprise
will provide the other end of a secure
communications channel for communicating
with the Mobile Device.
A.COMMS_NET OE.COMMS_NET This objective for the IT environment ensures
that the assumption is upheld that the user
environment will provide the other end of a
secure communications channel for
communicating with the Mobile Device.
A.SEC_POLICY OE.SEC_POLICY This objective for the IT environment ensures
that the assumption is upheld that the enterprise
will provide a suitable interface for creating and
applying enterprise Mobile Device security
policies.
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7.3 Security requirements rationale
7.3.1 Dependency analysis
Table 15 – TOE SFR dependency demonstration
SFR Dependency Inclusion
FCS_CKM.1 [FCS_CKM.2 Cryptographic key distribution, or
FCS_COP.1 Cryptographic operation]
FCS_CKM.4 Cryptographic key destruction
FMT_MSA.2 Secure security attributes
FCS_COP.1
FCS_CKM.4
FMT_MSA.2
FCS_COP.1 [FDP_ITC.1 Import of user data without security attributes, or
FDP_ITC.2 Import of user data with security attributes, or
FCS_CKM.1 Cryptographic key generation]
FCS_CKM.4 Cryptographic key destruction
FMT_MSA.2 Secure security attributes
FCS_CKM.1
FCS_CKM.4
FMT_MSA.2
FCS_CKM.4 [FDP_ITC.1 Import of user data without security attributes, or
FDP_ITC.2 Import of user data with security attributes, or
FCS_CKM.1 Cryptographic key generation]
FMT_MSA.2 Secure security attributes
FCS_CKM.1
FMT_MSA.2
FDP_ACC.1a FDP_ACF.1 Security attribute based access control FDP_ACF.1
FDP_ACF.1a FDP_ACC.1 Subset access control
FMT_MSA.3 Static attribute initialisation
FDP_ACC.1
FMT_MSA.3
FDP_IFC.1 FDP_IFF.1 Simple security attributes FDP_IFF.1
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SFR Dependency Inclusion
FDP_IFF.1 FDP_IFC.1 Subset information flow control
FMT_MSA.3 Static attribute initialisation
FDP_IFC.1
FMT_MSA.3
FTP_ITC.1 No dependencies. N/A
FDP_ACC.1a FDP_ACF.1 Security attribute based access control FDP_ACF.1
FDP_ACF.1a FDP_ACC.1 Subset access control
FMT_MSA.3 Static attribute initialisation
FDP_ACC.1
FMT_MSA.3
FIA_AFL.1 FIA_UAU.1 Timing of authentication FIA_UAU.1
FIA_ATD.1 No dependencies. N/A
FIA_SOS.1 No dependencies. N/A
FIA_UAU.1 FIA_UID.1 Timing of identification Not included – see rationale below.
FIA_UAU.7 FIA_UAU.1 Timing of authentication FIA_UAU.1
FIA_SSL.1.EX FIA_UAU.1 Timing of authentication FIA_UAU.1
FIA_SSL.2.EX FIA_UAU.1 Timing of authentication FIA_UAU.1
FMT_MOF.1a FMT_SMR.1 Security roles
FMT_SMF.1 Specification of Management Functions
FMT_SMR.1
FMT_SMF.1
FMT_MSA.1a [FDP_ACC.1 Subset access control,
FDP_IFC.1 Subset information flow control]
FMT_SMR.1 Security roles
FMT_SMF.1 Specification of Management Functions
FDP_ACC.1 and
FDP_IFC.1
FMT_SMR.1
FMT_SMF.1
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SFR Dependency Inclusion
FMT_MSA.1b [FDP_ACC.1 Subset access control,
FDP_IFC.1 Subset information flow control]
FMT_SMR.1 Security roles
FMT_SMF.1 Specification of Management Functions
FDP_ACC.1 and
FDP_IFC.1
FMT_SMR.1
FMT_SMF.1
FMT_MSA.1c [FDP_ACC.1 Subset access control,
FDP_IFC.1 Subset information flow control]
FMT_SMR.1 Security roles
FMT_SMF.1 Specification of Management Functions
FDP_ACC.1 and
FDP_IFC.1
FMT_SMR.1
FMT_SMF.1
FMT_MOF.1b FMT_SMR.1 Security roles
FMT_SMF.1 Specification of Management Functions
FMT_SMR.1
FMT_SMF.1
FMT_MSA.2 ADV_SPM.1 Informal TOE security policy model
[FDP_ACC.1 Subset access control, or
FDP_IFC.1 Subset information flow control]
FMT_MSA.1 Management of security attributes
FMT_SMR.1 Security roles
Not included – see rational below.
FDP_ACC.1 and
FDP_IFC.1
FMT_MSA.1
FMT_SMR.1
FMT_MSA.3a FMT_MSA.1 Management of security attributes
FMT_SMR.1 Security roles
FMT_MSA.1
FMT_SMR.1
FMT_MSA.3b FMT_MSA.1 Management of security attributes
FMT_SMR.1 Security roles
FMT_MSA.1
FMT_SMR.1
FMT_MSA.3c FMT_MSA.1 Management of security attributes
FMT_SMR.1 Security roles
FMT_MSA.1
FMT_SMR.1
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SFR Dependency Inclusion
FMT_SMF.1 No dependencies. N/A
FMT_SMR.1 FIA_UID.1 Timing of identification Not included – see rationale below.
7.3.2 Rationale for not addressing all dependencies
116 ADV_SPM.1 is a dependency of FMT_MSA.2 that has not been included. In this case, the requirement for an Informal Security Policy
Model (ISPM) has been met by a clear statement of the TOE security policy within this Security Target. In addition, the subordinate
policies are straightforward and complete.
117 FIA_UID.1 is a dependency of FIA_UAU.1 and FIA_SMR.1 that has not been included. The TOE is a single-user operating system
and the implementation of a user identifier associated with the Mobile User is therefore redundant.
7.3.3 Rationale for explicit security functional requirements
Table 16 – Rationale for explicitly stated security functional requirements
Explicit SFR Based on Dependency Rationale
FTA_SSL.1-EX TSF-
initiated session lock
And
FTA_SSL.2-EX – User-
initiated locking
FTA_SSL.1 TSF-initiated
session lock
and
FTA_SSL.2 – User-initiated
locking
FIA_UAU.1 The TOE does not wipe clear the user interface after a session
lock as there are a number of activities that can be performed on
the TOE prior to successful authentication by a Mobile User (see
FIA_UAU.1). This functionality needs to be maintained after a
session lock.
The modification of the base SFRs FTA_SSL.1 and FTA_SSL.2
could not be considered a refinement. Therefore, this modification
had to be stated as an explicit SFR.
The SFR is measurable and compliance or noncompliance can be
readily determined. Additionally, as the requirement does not differ
significantly from the base SFR the statement of requirement can
be considered clear and unambiguous. The dependency for
FTA_SSL.1 has also been retained.
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7.3.4 IT environment SFR dependency demonstration
Table 17 – IT environment SFR dependency demonstration
SFR Dependency Inclusion
FCS_CKM.1 [FCS_CKM.2 Cryptographic key distribution, or
FCS_COP.1 Cryptographic operation]
FCS_CKM.4 Cryptographic key destruction
FMT_MSA.2 Secure security attributes
FCS_COP.1
FCS_CKM.4
FMT_MSA.2
FCS_COP.1 [FDP_ITC.1 Import of user data without security attributes, or
FDP_ITC.2 Import of user data with security attributes, or
FCS_CKM.1 Cryptographic key generation]
FCS_CKM.4 Cryptographic key destruction
FMT_MSA.2 Secure security attributes
FCS_CKM.1
FCS_CKM.4
FMT_MSA.2
FCS_CKM.4 [FDP_ITC.1 Import of user data without security attributes, or
FDP_ITC.2 Import of user data with security attributes, or
FCS_CKM.1 Cryptographic key generation]
FMT_MSA.2 Secure security attributes
FCS_CKM.1
FMT_MSA.2
FIA_UAU.2 FIA_UID.1 Timing of Identification FIA_UID.2
FIA_UID.2 No dependencies N/A
FIA_ATD.1 No dependencies N/A
FMT_MOF.1a FMT_SMR.1 Security roles
FMT_SMF.1 Specification of Management Functions
FMT_SMR.1
FMT_SMF.1
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SFR Dependency Inclusion
FMT_MOF.1b FMT_SMR.1 Security roles
FMT_SMF.1 Specification of Management Functions
FMT_SMR.1
FMT_SMF.1
FMT_SMF.1 No dependencies N/A
FMT_SMR.1 FIA_UID.1 Timing of identification FIA_UID.2
FTP_ITC.1 No dependencies N/A
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7.3.5 TOE IT requirements correspondence
Table 18 – Mapping TOE SFRs to objectives
Objective SFRs Demonstration
O.COMMS_CONF FCS_CKM.1
FCS_COP.1
FCS_CKM.4
FCS_CKM.1 provides support for implementing communications that have both confidentiality and
integrity security properties.
FCS_COP.1 implements cryptographic operations for providing secure communications with the
enterprise and/or network environment.
FCS_CKM.4 provides support for implementing communications that have both confidentiality and
integrity security properties.
FCS_CKM.1, FCS_COP.1 and FCS_CKM.4 combine to ensure that the O.COMMS_CONF objective
is met.
O.COMMS_INT FCS_CKM.1
FCS_COP.1
FCS_CKM.4
FCS_CKM.1 provides support for implementing communications that have both confidentiality and
integrity security properties.
FCS_COP.1 implements cryptographic operations for providing secure communications with the
enterprise and/or network environment.
FCS_CKM.4 provides support for implementing communications that have both confidentiality and
integrity security properties.
FCS_CKM.1, FCS_COP.1 and FCS_CKM.4 combine to ensure that the O.COMMS_INT objective is
met.
O.CODE_CTRL FDP_ACC.1a
FDP_ACF.1a
FDP_ACC.1a provides the basis for implementing an access control policy that ensures only
permitted applications can be installed and executed on the TOE.
FDP_ACF.1a provides the security policy statements designed to govern the control of applications
when being installed or executed on the TOE.
FDP_ACC.1a and FDP_ACF.1a combine to ensure that the O.CODE_CTRL objective is met.
O.MGMT_AUTH FDP_ACC.1b
FDP_ACF.1b
FDP_ACC.1b provides the basis for establishing a security policy within the TOE for controlling the
configuration of the Mobile Device.
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Objective SFRs Demonstration
FDP_ACF.1b provides the security policy statements to support the implementing of device
configuration control for the TOE.
FDP_ACC.1b and FDP_ACF.1b combine to ensure that the O.MGMT_AUTH objective is met.
O.USER_AUTH FIA_ATD.1
FIA_UAU.1
FIA_UAU.7
FIA_ATD.1 provides the set of security attributes that must be associated with a Mobile User to
enable Mobile Device Authentication.
FIA_UAU.1 provides the capability for the TOE to be able to offer a number of display notifications
and essential services prior to requiring a Mobile User Authentication event. This enables the TOE to
operate as a mobile messaging solution without compromising TSF or user data.
FIA_UAU.7 provides detailed information relating to feedback that can be provided to the user when
conducting a Mobile User Authentication event.
FIA_ATD.1, FIA_UAU.1 and FIA_UAU.7 combine to ensure that the O.USER_AUTH objective is met.
O.REMOTE_ADMIN FDP_IFC.1
FDP_IFF.1
FTP_ITC.1
FMT_MOF.1a
FMT_MSA.1a
FMT_MSA.1b
FMT_MSA.1c
FMT_MOF.1b
FMT_MSA.2
FMT_MSA.3a
FMT_MSA.3b
FMT_MSA.3c
FMT_SMF.1
FDP_IFC.1 provides the basis for implementing a policy within the TOE for controlling the flow of
information, mailbox items, Exchange ActiveSync Mailbox Policy and Exchange Commands,
between the TOE and the Enterprise Exchange Server.
FDP_IFF.1 implements the policy that governs the flow of information between the TOE and the
Enterprise Exchange Server, including TSF and user data.
FTP_ITC.1 provides the capability to support a trusted and secure channel between the TOE and
Enterprise Exchange Server so that the TOE is able to access enterprise information in a secure
manner.
FMT_MOF.1a provides the restrictions that are necessary for protecting the management and
configuration of the device data protection functionality of the TOE.
FMT_MSA.1a provides the restrictions that are necessary for protecting the management and
configuration of the device application control functionality of the TOE.
FMT_MSA.1b provides the restrictions that are necessary for protecting the management and
configuration of the secure enterprise access functionality of the TOE.
FMT_MSA.1c provides the restrictions that are necessary for protecting the management and
configuration of the device configuration control functionality of the TOE.
FMT_MOF.1b provides the restrictions that are necessary for protecting the management of the
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Objective SFRs Demonstration
device access control functionality of the TOE.
FMT_MSA.2 provides assurance that security attributes established for each of the security policies
are loaded with appropriate default values, supporting the secure management of the TOE.
FMT_MSA.3a provides restrictions and controls for managing security attributes associated with the
device application control security policy.
FMT_MSA.3b provides restrictions and controls for managing security attributes associated with the
secure enterprise access security policy.
FMT_MSA.3c provides restrictions and controls for managing security attributes associated with the
device configuration control security policy.
FMT_SMF.1 provides a specification for the set of device security management functions that are
required to support the secure administration and operation of the TOE.
FDP_IFC.1, FDP_IFF.1, FTP_ITC.1, FMT_MOF.1a, FMT_MSA.1a, FMT_MSA.1b, FMT_MSA.1c,
FMT_MOF.1b, FMT_MSA.2, FMT_MSA.3a, FMT_MSA.3b, FMT_MSA.3c and FMT_SMF.1 all
combine to ensure that the O.REMOTE_ADMIN objective is met.
O.SECRET FIA_SOS.1 FIA_SOS.1 provides the capability for the TOE to implement strong password policies in response to
settings to be established by the Enterprise Administrator.
O.LOCAL_WIPE FIA_AFL.1 FIA_AFL.1 provides the requirement for the TOE to implement a secure wipe of all user and TSF
data stored on the Mobile Device in response to an Enterprise Administrator configurable number of
failed authentication attempts.
O.ROLES FMT_SMR.1 FMT_SMR.1 provides a specification of the various roles that the TOE is required to recognize and
apply.
O.SESSION_LOCK FTA_SSL.1.EX
FTA_SSL.2.EX
FTA_SSL.1.EX provides the ability to lock an interactive session after an Enterprise Administrator
specified period of time.
FTA_SSL.2.EX provides the Mobile User with the ability to lock a current interactive session so that
authentication is required to unlock Mobile Device.
FTA_SSL.1.EX and FTA_SSL.2.EX combine to ensure that the O.SESSION_LOCK objective is met.
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Objective SFRs Demonstration
O.REMOTE_WIPE FDP_IFC.1
FDP_IFF.1
FDP_IFC.1 ensures that the Mobile Device can accept a remote wipe command from the Enterprise
Administrator through the Enterprise Exchange Server.
FDP_IFF.1 implements the policy that governs the flow of information between the TOE and the
Enterprise Exchange Server and allows the application of the remote wipe command.
FDP_IFC.1 and FDP_IFF.1 combine to ensure that the O.REMOTE_WIPE objective is met.
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7.3.6 IT environment requirements correspondence
Table 19 – Mapping IT environment SFRs to objectives
Objective SFRs Demonstration
OE.I&A_ENTERPRISE FIA_UAU.2
FIA_UID.2
FIA_ATD.1
FIA_UAU.2 ensures that the Enterprise Administrator is properly authenticated in the enterprise
environment so that trust can be placed in the integrity of the management functions being
performed via the Exchange Server.
FIA_UID.2 ensures that the Enterprise Administrator is properly identified, prior to authentication, in
the enterprise environment so that trust can be placed in the integrity of the management functions
being performed via the Exchange Server.
FIA_ATD.1 provides the necessary attributes required to support the identification and
authentication of the Enterprise Administrator.
FIA_UAU.2, FIA_UID.2 and FIA_ATD.1 combine to ensure that the OE.I&A_ENTERPRISE
environment objective is met.
OE.COMMS_ENT FCS_CKM.1
FCS_COP.1
FCS_CKM.4
FTP_ITC.1
FCS_CKM.1 provides cryptographic support through key generation that enables the
implementation of cryptographic operations for secure communications between the TOE and
components/systems within the enterprise environment.
FCS_COP.1 provides the cryptographic operations to implement secure communications between
the TOE and components/systems within the enterprise environment.
FCS_CKM.4 provides a mechanism for securely disposing of cryptographic keys that have been
generated by the various systems/components within the enterprise environment that communicate
using cryptographic protection with the TOE.
FTP_ITC.1 implements an inter-TSF trusted channel, this SFR within the IT environment provides
the other end of the trusted channel for the enterprise environment.
FCS_CKM.1, FCS_COP.1, FCS_CKM.4 and FTP_ITC.1 combine to ensure that the
OE.COMMS_ENT environment objective is met.
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Objective SFRs Demonstration
OE.COMMS_NET FCS_CKM.1
FCS_COP.1
FCS_CKM.4
FTP_ITC.1
FCS_CKM.1 provides cryptographic support through key generation that enables the
implementation of cryptographic operations for secure communications between the TOE and
components/systems within the network environment.
FCS_COP.1 provides the cryptographic operations to implement secure communications between
the TOE and components/systems within the network environment.
FCS_CKM.4 provides a mechanism for securely disposing of cryptographic keys that have been
generated by the various systems/components within the network environment that communicate
using cryptographic protection with the TOE.
FTP_ITC.1 implements an inter-TSF trusted channel, this SFR within the IT environment provides
the other end of the trusted channel for the network environment.
FCS_CKM.1, FCS_COP.1, FCS_CKM.4 and FTP_ITC.1 combine to ensure that the
OE.COMMS_NET environment objective is met.
OE.SEC_POLICY FMT_MOF.1a
FMT_MOF.1b
FMT_SMF.1
FMT_SMR.1
FMT_MOF.1a ensures that the Enterprise Administrator is able to provide the necessary security
management functions within the enterprise environment.
FMT_MOF.1b ensures that the Mobile Operator is able to provide the necessary security
management functions within the network environment.
FMT_SMF.1 defines the set of security management functions that must be provided within the
enterprise and network environments to support the security functionality of the TOE.
FMT_SMR.1 ensures that the necessary security roles required within the enterprise and network
environment to provide security management functionality for the TOE.
FMT_MOF.1a, FMT_MOF.1b, FMT_SMF.1 and FMT_SMR.1 combine to ensure that the
OE.SEC_POLICY is met.
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7.3.7 TOE assurance requirements
118 This ST contains the assurance requirements from the CC EAL2 assurance package augmented with ALC_FLR.1. Augmentation was
chosen to provide the added assurance that is provided by defining flaw remediation procedures. This ST is based on good rigorous
commercial development practices and has been developed for a general environment for a TOE that is readily available and does
not require modification to meet the security needs of the environment specified in this ST.
119 The EAL chosen is based on the statement of the security environment (threats, organizational policies, assumptions) and the
security objectives defined in this ST. The sufficiency of the EAL chosen is justified based on those aspects of the environment that
have impact upon the assurance needed in the TOE. Specifically, that the TOE will not process information that requires protection
from attackers possessing a high or moderate attack potential, and that protection from obvious vulnerabilities is required.
7.3.8 Demonstration of Mutual Support
120 The dependency analysis provided at Table 15 and the analyses provided in Table 17, Table 18, Table 19 and Table 20 demonstrate
that the IT security functions work together to satisfy the stated security functionality of the TOE.
121 The demonstration of the implementation of the majority of dependencies, and a suitable rationale for those dependencies that have
not been implemented, demonstrates mutual support between security requirements, and therefore, the security functions and
mechanisms that implement them.
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7.4 TOE summary specification rationale
7.4.1 IT security functions
Table 20 – Mapping TOE SFRs to TOE security functions
SFR
Device
data
protection
Device
application
control
Secure
enterprise
access
Device
configuration
control
Device
access
control
Device
security
management
Demonstration
FCS_CKM.1 X The device data protection security function implements the
FCS_CKM.1 requirement by creating cryptographic keys for each of
the functions that protect data with a cryptographic mechanism.
FCS_COP.1 X The device data protection security function implements the
FCS_COP.1 requirement by providing cryptographic protection for
TSF and user data in transit between the TOE and external entities.
FCS_CKM.4 X The device data protection security function implements the
FCS_CKM.4 requirement by ensuring that cryptographic keys can
be effectively destroyed.
FDP_ACC.1a X The device application control security function implements the
FDP_ACC.1a requirement by controlling the installation and
execution on the TOE of applications.
FDP_ACF.1a X The device application control security function implements the
FDP_ACF.1a security function by implementing controls to align with
the set of specific security policy rules identified in this requirement.
FDP_IFC.1 X The secure enterprise access security function implements the
FDP_IFC.1 requirement by implementing the information attributes
that provide the foundation for controlling information flow.
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SFR
Device
data
protection
Device
application
control
Secure
enterprise
access
Device
configuration
control
Device
access
control
Device
security
management
Demonstration
FDP_IFF.1 X The secure enterprise access security function implements the
FDP_IFF.1 requirement by implementing controls to align with the
set of specific security policy rules identified by this requirement.
FTP_ITC.1 X The security enterprise access security function implements the
FTP_ITC.1 requirement by providing the device-side of a secure
communications channel between the TOE and enterprise.
FDP_ACC.1b X The device configuration control security function implements the
FDP_ACC.1b requirement by providing controls to ensure that
management or provisioning data will only be applied from a secure
and authenticated source.
FDP_ACF.1b X The device configuration control security function implements the
FDP_ACF.1 requirement by implementing the set of subjects and
objects specified by this policy for accepting and applying
configuration data.
FIA_AFL.1 X The device access control security function implements the
FIA_AFL.1 requirement by implementing a mechanism to ensure
that the device is wiped in response to repeated authentication
failure.
FIA_ATD.1 X The device access control security function implements the
FIA_ATD.1 requirement by implementing the attributes that are
associated with the Mobile User.
FIA_SOS.1 X The device access control security function implements the
FIA_SOS.1 requirement by implementing the ability to apply strong
password requirements.
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SFR
Device
data
protection
Device
application
control
Secure
enterprise
access
Device
configuration
control
Device
access
control
Device
security
management
Demonstration
FIA_UAU.1 X The device access control security function implements the
FIA_UAU.1 requirement by permitting the use of the TOE for the
specified functions prior to authentication.
FIA_UAU.7 X The device access control security function implements the
FIA_UAU.7 requirement by implementing the specific prompts and
permitted feedback regarding authentication status.
FTA_SSL.1.EX X The device access control security function implements the
FTA_SSL.1.EX requirement by providing the ability to lock and
interactive session after an Enterprise Administrator specified period
of time.
FTA_SSL.2.EX X The device access control security function implements the
FTA_SSL.2.EX requirement by providing the Mobile User with the
ability to lock a current interactive session so that authentication is
required to unlock Mobile Device.
FMT_MOF.1a X The device security management security function implements the
FMT_MOF.1a requirement by enabling the specified management
functionality for the data protection function and associated
cryptographic attributes.
FMT_MSA.1a X The device security management security function implements the
FMT_MSA.1a requirement by enabling the specified management
functionality for the device application control function.
FMT_MSA.1b X The device security management security function implements the
FMT_MSA.1b requirement by enabling the specified management
functionality for the secure enterprise access function.
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SFR
Device
data
protection
Device
application
control
Secure
enterprise
access
Device
configuration
control
Device
access
control
Device
security
management
Demonstration
FMT_MSA.1c X The device security management security function implements the
FMT_MSA.1c requirement by enabling the specified management
functionality for the device configuration control function.
FMT_MOF.1b X The device security management security function implements the
FMT_MOF.1b requirement by enabling the specified management
functionality for the device access control function.
FMT_MSA.2 X The device security management security function implements the
FMT_MSA.2 requirement by ensuring that only secure values can
be applied to security attributes.
FMT_MSA.3a X The device security management security function implements the
FMT_MSA.3a requirement by ensuring that there are static
attributes applied during initialization for the Device Application
Control SFP.
FMT_MSA.3b X The device security management security function implements the
FMT_MSA.3b requirement by ensuring that there are static
attributes applied during initialization for the Secure Enterprise
Access SFP.
FMT_MSA.3c X The device security management security function implements the
FMT_MSA.3 requirement by ensuring that there are static attributes
applied during initialization for the Device Configuration Control SFP.
FMT_SMF.1 X The device security management security function implements the
FMT_SMF.1 requirement by implementing the set of security
management functions that are to be provided for the TOE.
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SFR
Device
data
protection
Device
application
control
Secure
enterprise
access
Device
configuration
control
Device
access
control
Device
security
management
Demonstration
FMT_SMR.1 X The device security management security function implements the
set of security roles established by the FMT_SMR.1 requirement.
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7.4.2 Assurance measures
Table 21 – Assurance measures rationale
Assurance requirement Assurance measures Demonstration
ACM_CAP.2 Configuration
items
Configuration management The configuration management assurance measure provides a detailed
description of the configuration management system used by Microsoft to control
the development of the TOE.
The documentation also provides a configuration list for the TOE.
ADO_DEL.1 Delivery
procedures
ADO_IGS.1 Installation,
generation, and start-up
procedures
Delivery and operation The delivery and operation assurance measures provides a set of delivery
procedures that provide effective guidance for ensuring that the TOE can be
delivered to the end-user in a secure and controlled manner.
This assurance measure also provides an installation guide that supports the
initiation of the TOE so that it can be initially installed and configured in the
evaluated configuration.
ADV_FSP.1 Informal
functional specification
ADV_HLD.1 Descriptive
high-level design
ADV_RCR.1 Informal
correspondence
demonstration
Development The development assurance measure provides all the necessary design
documentation to support the effective detailed analysis of the TOE for an
evaluation at EAL2.
The functional specification provides a detailed description of the external
interfaces to the security functions of the TOE.
The high-level design provides detailed description of the subsystems of the TOE
that implement the security functions.
The correspondence demonstration provides a method for mapping between the
design representations provided for the TOE.
AGD_ADM.1 Administrator
guidance
AGD_USR.1 User guidance
Guidance documents The guidance documents assurance measure provides the guidance
documentation for both users and administrators of the TOE.
These documents provide all the necessary instructions and direction for
ensuring that the TOE is used and administered in a secure manner.
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Assurance requirement Assurance measures Demonstration
ALC_FLR.1 Basic flaw
remediation
Life cycle support The life cycle support assurance measures provides a set of procedures aimed at
the identifying, reporting and addressing security flaws or bugs that may appear
in the TOE.
ATE_COV.1 Evidence of
coverage
ATE_FUN.1 Functional
testing
ATE_IND.2 Independent
testing – sample
Tests The tests assurance measure ensures that the TOE has been appropriately
tested for the claimed set of security functions.
The test plan for the TOE identifies the set of security functions that are to be
tested, the procedures for establishing the test environment and also for
conducting the test cases.
The results of the tests are also recorded to provide evidence of test results.
AVA_SOF.1 Strength of
TOE security function
evaluation
AVA_VLA.1 Developer
vulnerability analysis
Vulnerability assessment The vulnerability assessment assurance measure provides confidence that the
TOE and its environment have been assessed for obvious vulnerabilities or
exposures.
A claim is also provided for the strength of function related to probabilistic
mechanisms that are non-cryptographic.