ZXSS10 SS1B and MSG-9000
Communication System
Security Target
ZTE CORPORATION
NO. 55, Hi-tech Road South, ShenZhen, P.R.China
Postcode: 518057
Tel: +86-755-26771900
Fax: +86-755-26770801
URL: http://ensupport.zte.com.cn
E-mail: support@zte.com.cn
Security Target ZTE ZXSS10 SS1B and MSG-9000
LEGAL INFORMATION
Copyright © 2011 ZTE CORPORATION.
The contents of this document are protected by copyright laws and international treaties.
All company, brand and product names are trade or service marks, or registered trade or
service marks, of ZTE CORPORATION or of their respective owners.
This document is provided “as is”, and all express, implied, or statutory warranties,
representations or conditions are disclaimed, including without limitation any implied
warranty of merchantability, fitness for a particular purpose, title or non-infringement. ZTE
CORPORATION and its licensors shall not be liable for damages resulting from the use of or
reliance on the information contained herein.
ZTE CORPORATION or its licensors may have current or pending intellectual property rights
or applications covering the subject matter of this document. Except as expressly provided
in any written license between ZTE CORPORATION and its licensee, the user of this
document shall not acquire any license to the subject matter herein.
ZTE CORPORATION reserves the right to upgrade or make technical change to this product
without further notice.
Users may visit ZTE technical support website http://ensupport.zte.com.cn to inquire related
information.
The ultimate right to interpret this product resides in ZTE CORPORATION.
Revision History
Version Date Comment
0.1 Feb 16, 2011 First version
0.2 August 9, 2011 Update after inclusion of Media Gateway
0.3 September 22, 2011 Complete first draft of SFR
0.4 September 29, 2011 First draft
0.5 October 5, 2011 Update according to EOR
0.6 October 6, 2011 Update according to EOR
0.7 October 18, 2011 Update according to EOR
0.8 November 01, 2011 Update according to EOR
2 Confidential and Proprietary Information of ZTE CORPORATION
References
[CCp1] Common Criteria for IT Security Evaluation, Part 1, v3.1r3, July
2009
[CCp2] Common Criteria for IT Security Evaluation, Part 2, v3.1r3, July
2009
[CCp3] Common Criteria for IT Security Evaluation, Part 3, v3.1r3, July
2009
[CEMe]Common Methodology for IT Security Evaluation, v3.1r3, July 2009
This page is intentionally blank.
Confidential and Proprietary Information of ZTE CORPORATION 4
Contents
1 ST Introduction .......................................................................................7
1.1 ST and TOE References ..........................................................................7
1.2 TOE Overview and usage ........................................................................7
1.2.1 Major security features ...........................................................................10
1.2.2 Non-TOE Hardware/Software/Firmware ................................................10
1.3 TOE Description .....................................................................................11
1.3.1 Physical scope........................................................................................11
1.3.2 Logical scope..........................................................................................14
1.3.3 Roles and external entities .....................................................................16
1.4 Excluded from evaluation .......................................................................16
2 Conformance Claims............................................................................17
3 Security Problem Definition ................................................................18
3.1 Organisational Security Policies.............................................................18
3.2 Threats....................................................................................................18
3.2.1 Assets and threat agents........................................................................18
3.2.2 Threats....................................................................................................20
3.3 Assumptions ...........................................................................................20
4 Security Objectives ..............................................................................21
4.1 Security objectives for the TOE..............................................................21
4.2 Security objectives for the Operational Environment .............................23
5 Security Requirements ........................................................................24
5.1 Extended components definition ............................................................24
5.2 Definitions...............................................................................................24
5.3 Security Functional Requirements .........................................................26
5.3.1 Identification & Authentication ................................................................26
5.3.2 Roles & Authorisation.............................................................................29
5.3.3 Logging & Auditing .................................................................................31
5.3.4 Communication.......................................................................................33
5.3.5 Management...........................................................................................35
5.4 Security Assurance Requirements .........................................................37
5.5 Security Assurance Requirements Rationale.........................................38
6 TOE Summary Specification ...............................................................39
Confidential and Proprietary Information of ZTE CORPORATION 5
Security Target ZTE ZXSS10 SS1B and MSG-9000
7 Rationales..............................................................................................42
7.1 Security Objectives Rationale.................................................................42
7.2 Security Functional Requirements Rationale .........................................45
7.3 Dependencies.........................................................................................48
6 Confidential and Proprietary Information of ZTE CORPORATION
1 ST Introduction
1.1 ST and TOE References
This is version 0.8 of the Security Target for the ZTE softswitch and media gateway
communication system, which consists of:
• ZTE ZXSS10 SS1b Soft Switching System
• MSG-9000 Media Gateway
• U31 v12.11.40 Element Management System
• Network Management Service Interface (NMSI) v2.3
1.2 TOE Overview and usage
The TOE is ZTE softswitch and media gateway communication system V1.0. The
TOE consists of a softswitch (SS1b), a media gateway (MSG-9000) between the
SS1b and the PSTN network, an element management system (EMS), and a
network management service interface (NMSI). The SS1b is used to provide signal
transfer, control, and management to the telecommunications network. The media
gateway is a translation device that translates the traffic from PSTN to IP network.
It also routes the traffic to the destination media gateway using the routing
information provided by the SS1b. The EMS is the management console used for
operators to manage the SS1b and media gateway. The NMSI is a gateway
between the SS1b and the BOSS (Business operation support system) server from
the operator. It provides I&A to the BOSS.
The TOE has the following general functionalities:
• Softswitch SS1b:
o Telecommunications functionalities:
o Interact with PSTN, Wireless Network, and Telecommunication IP
network to perform the management and control functions of the
telecommunication network
o Interact with the Billing Center to charge for these functionalities
o Management functionalities:
o Interact with EMS to be managed and configured (except for lawful
interception)
o Interact with the BOSS to allow the BOSS User to manage the
user profile.
• Media gateway MSG-9000:
o Telecommunication functionalities:
o Connects the PSTN to the IP core network through trunk lines, and
performs voice/fax conversion on the PSTN/ISDN side as well as
on the IP network side
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Security Target ZTE ZXSS10 SS1B and MSG-9000
o Interconnect signaling between SS7 and packet switched network
o Connects the analog Z interface, ISDN users, V5.2 users and DSL
users to the IP network.
o Management functionalities:
o Interact with EMS to be managed and configured (except for lawful
interception)
• EMS system:
o EMS server (EMS): manage SS1b and media gateway
o EMS client: a GUI for user to use EMS server
• NMSI:
o Interface between BOSS to the SS1b.
The interconnection of each part of the TOE is depicted in Figure 1.
L3 Switch
TOE
Environment
IP Mgt.
Network
EMS Client
PC
EMS Client
PC
PC
MSG-9000
EMS
DB
Server
SS1b
Service
Part
BSVR
NMSI
L3 switch
Secure
Network
Figure 1 Interconnection between each part of the TOE
These entities are:
o A ZXSS10 SS1b Softswitch, consisting of:
• A SS1b Service Part, responsible for handling all incoming and outgoing
traffic, and performing telecommunications services.
• A BSVR (Billing Server), responsible for generate billing information and
providing this information to the Billing Center for further processing.
• A DB Server (Database Server), responsible for storing service data
such as route data, number analysis data, and the user profile data.
o An ZXMSG 9000 Media Gateway, responsible for translating the traffics
from PSTN to IP network.
o An NMSI （Network Management Service Interface), is a gateway between
BOSS to the SS1b. It provides I&A to the BOSS and pass MML commands
from BOSS to SS1b.
o An EMS (Element Management System), responsible for management and
maintenance of the whole SS1b and media gateway.
o An EMS Client, consisting of a Java application, running on a non-TOE
workstation.
8 Confidential and Proprietary Information of ZTE CORPORATION
Security Target ZTE ZXSS10 SS1B and MSG-9000
The BSVR and the DB server connected via the SS1b service part to the external
network. They do not directly connect to the external network. The NMSI is
connected to the same L3 switch as the SS1b but is located in different VLAN. The
EMS Server & EMS client could be further away (e.g. connected over the IP
management network). The EMS server does not directly connect to the external
network but connect through an L3 switch to the external network.
The ZXSS10 SS1b and MSG-9000 media gateway performs management, control,
and routing part of the Telecommunication Network and is therefore connected to a
wide variety of other systems, as shown in Figure 2.
L3 Switch
PSTN
PSTN
Billing
Center
TOE
Environment (In scope)
IP Mgt.
Network
IP Mgt.
Network
EMS Client
PC
PC
NTP
Wireless
Network
Wireless
Network
Telecomm.
IP Network
Telecomm.
IP Network
Alarm
Box
MSG-9000
BOSS NMSI
DB
Server
SS1b
Service
Part
BSVR DB
Server
SS1b
Service
Part
BSVR
LIG
LIC
SS1b
EMS
L3 switch
EMS
L3 switch
Secure
Network
Secure
Network
Boss
Network
Boss
Network
Figure 2: The TOE in its environment
These additional1
systems and networks are:
• A Billing Center. This is a centralized server that processes the billing
information of multiple TOEs (and other equipment). It obtains the billing
information from the BSVR part of the TOE.
• A BOSS (Business Operation Support System). BOSS is used as a
gateway for operator to manage its subscribers. BOSS connects to the
NMSI of the TOE.
• The wireless network and PSTN (Public Switching Telecommunication
Network): The traditional fixed switching networks that connect subscribers
to each other. These networks connect to the MSG-9000 part of the TOE.
• Telecommunication IP network: IP network such as internet. It connects to
the SS1b service part.
• LIG and LIC: Lawful interception gateway and lawful interception center.
LIC issues commands to LIG, and LIG connects to SS1b to transfer lawful
interception commands from the LIC.
1
Additional to those described earlier
Confidential and Proprietary Information of ZTE CORPORATION 9
Security Target ZTE ZXSS10 SS1B and MSG-9000
• NTP: provides time to the TOE.
• IP Management Network: An operator maintained network where all
management entities (EMS, Billing center, NTP, EMS server, etc) are all
connected to it. IP management network is separated from the
telecommunication network.
• BOSS network: a operator maintained VLAN for all BOSSes to connect to
NMSI.
• A secure network between the EMS and the MSG-9000 to protect the
communication between the EMS and the MSG-9000.
• PSTN: Public Switched Telephone Network, conventional analog
telephone network.
• Wireless Network: network such as GSM, UMTS, CDMA. Users from this
network can communicate with users in PSTN or telecommunication IP
network via SS1b.
• Telecommunication IP network: network contains equipments such as user
level VoIP phone, HLR, media gateways, and access gateways. Note that
internet is not part of this network.
1.2.1 Major security features
The TOE:
o Provides secure management of itself, to ensure that only properly
authorized staff can manage the TOE
o Provides secure management of SS1b user profile data, to ensure only
properly authenticated external entities can manage SS1b user profile data.
o Provides secure access of SS1b billing data, to ensure only properly
authenticated external entities can access SS1b billing data.
o Provides a flexible role-based authorization framework with predefined and
customizable roles (EMS only)
o Provides logging and auditing of user actions (EMS only)
o Provides secure interaction between SS1b and the billing center, so that
billing data cannot be read or modified in between
o Provides secure interaction between SS1b and the BOSS, so that user
profile data cannot be read or modified in between
1.2.2 Non-TOE Hardware/Software/Firmware
The TOE requires network connectivity, a NTP server as time source, and L3
switches to separate its various networks. Additionally, the EMS client requires:
Type Name and version
Workstation
A PC suitable to run the OS (see below) and with at least 2GB
memory, or
GPDU1 PCBA2
OS ZTE CGSL V3_02_00_P3, or
2
GPDU1 PCBA is a blade server
10 Confidential and Proprietary Information of ZTE CORPORATION
Security Target ZTE ZXSS10 SS1B and MSG-9000
Windows 7 or above
1.3 TOE Description
1.3.1 Physical scope
The TOE consists of the following:
Type Name and version
SS1b service part ESPC
DB server GPDU1 PCBA
BSVR GPDU1 PCBA
2 x MOMP
2 x MCMP
2 x MSIPI
2 x MUIMC
Central Control Unit
2 x CLKG
1 x MRB
1 x MTDB
2 x MIPI
1 x MVTCA
MSG-9000
Service Resource Unit
2 x MUIMT
1 x MSPB
EMS server GPDU1 PCBA
Hardware
NMSI GPDU1 PCBA
SS1b service part ZXSS10 SS1b v2.0.1.07
DB server Oracle 10.2.0.4
Suse linux 10
ZXSS10 SS1b v2.0.1.07
BSVR Oracle 10.2.0.4
Suse linux 10
ZXSS10 SS1b v2.0.1.07
MSG-9000 ZXMSG9000 v1.0.05
EMS server NetNumen U31 R30 V12.11.40
CGSL V3.02.00_P3
Oracle 10.2.0.4.0 for Linux
JDK1.6.0_18
NMSI CGSL V3_02_00_P3
NMSI 2.2.4
Software
EMS client NetNumen U31 R30 V12.11.40
Confidential and Proprietary Information of ZTE CORPORATION 11
Security Target ZTE ZXSS10 SS1B and MSG-9000
The TOE is delivered with the following guidance:
Operational guidance is:
ZXSS10 SS1b guidance
CC Guidance
• ZXSS10 SS1b Common Criteria Security Evaluation – Certified
Configuration R1.0
Standard guidance
• ZXSS10 SS1b (V2.0.1.07) Documentation Guide
• ZXSS10 SS1b (V2.0.1.07) System Description
• ZXSS10 SS1b (V2.0.1.07) Product Description
• ZXSS10 SS1b (V2.0.1.07) Hardware Description
Installation and maintenance
• ZXSS10 SS1b (V2.0.1.07) Hardware Installation Guide
• ZXSS10 SS1b (V2.0.1.07) Software Installation Guide Foreground Board
• ZXSS10 SS1b (V2.0.1.07) Software Installation Guide PC Server
• ZXSS10 SS1b (V2.0.1.07) Software Installation Guide SUN Server
Data configuration
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide AG Interconnection
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide Application Server
Interconnection
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide Digit Analysis
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide DIGITMAP
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide Disaster Recovery
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide Global Configuration
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide H323 GK
Interconnection
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide H323 Terminal
Interconnection
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide IAD Interconnection
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide MGCF Feature
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide MSG9000
Interconnection
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide Other SS
Interconnection
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide PRA and BRA
Subscriber
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide PRA Trunk
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide Route
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide SCP Interconnection
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide SG Interconnection
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide SHLR
12 Confidential and Proprietary Information of ZTE CORPORATION
Security Target ZTE ZXSS10 SS1B and MSG-9000
Interconnection
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide SIP Terminal
Interconnection
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide SSF Feature
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide Subscriber Allocation
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide TG Interconnection
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide Trunk
• ZXSS10 SS1b (V2.0.1.07) Data Configuration Guide V5 Interconnection
• ZXSS10 SS1b (V2.0.1.07) Global Variable Reference
• ZXSS10 SS1b (V2.0.1.07) Northbound Interface Reference
(Toll_Office_Format)
• ZXSS10 SS1b (V2.0.1.07) Operation Guide Data Backup and Restoration
• ZXSS10 SS1b (V2.0.1.07) Operation Guide File Management and Data
Query
• ZXSS10 SS1b (V2.0.1.07) Operation Guide Signaling Tracing
• ZXSS10 SS1b (V2.0.1.07) Operation Guide System Maintenance
• ZXSS10 SS1b (V2.0.1.07) Operation Guide Traffic Control
• ZXSS10 SS1b (V2.0.1.07) Operation Guide Traffic Statistics
• ZXSS10 SS1b (V2.0.1.07) Service Provisioning Guide Authenticationand
Call Restriction
• ZXSS10 SS1b (V2.0.1.07) Service Provisioning Guide CENTREX
• ZXSS10 SS1b (V2.0.1.07) Service Provisioning Guide Multi-Line Selected
Group
• ZXSS10 SS1b (V2.0.1.07) Service Provisioning Guide Supplementary
Service I
• ZXSS10 SS1b (V2.0.1.07) Service Provisioning Guide Supplementary
Service II
• ZXSS10 SS1b (V2.0.1.07) Timer Reference
• ZXSS10 SS1b (V2.0.1.07) Traffic Statistics Entity Reference Volume I
• ZXSS10 SS1b (V2.0.1.07) Traffic Statistics Entity Reference Volume II
Alarm
• ZXSS10 SS1b (V2.0.1.07) Alarm and Notification Message Reference
Alarm Volume
• ZXSS10 SS1b (V2.0.1.07) Alarm and Notification Message Reference
Notification Volume
• ZXSS10 SS1b (V2.0.1.07) Failure Code Reference I
• ZXSS10 SS1b (V2.0.1.07) Failure Code Reference II
• ZXSS10 SS1b (V2.0.1.07) Failure Code Reference III
• ZXSS10 SS1b (V2.0.1.07) Routine Maintenance
• ZXSS10 SS1b (V2.0.1.07) Troubleshooting Guide
BSVR
• ZXSS10 SS1b (V2.0.1.07) Charging Server User Manual
BOSS
Confidential and Proprietary Information of ZTE CORPORATION 13
Security Target ZTE ZXSS10 SS1B and MSG-9000
• ZXSS10 SS1b (V2.0.1.07) Softswitch Control Equipment BOSS Command
Reference
• ZXSS10 SS1b (V2.0.1.07) Softswitch Control Equipment BOSS Command
Reference (Supplementary)
MSG-9000 Guidance
• ZXMSG 9000(V1.0.05.R03)_Guide to Documentation_EN
• ZXMSG 9000(V1.0.05.R03)_Hardware Description---9000 Volume_EN
• ZXMSG 9000(V1.0.05.R03)_Hardware Installation---9000 Volume_EN
• ZXMSG 9000(V1.0.05.R03)_Software Installation---9000 Volume_EN
• ZXMSG_9000(V1.0.05.R03)_Operation_Guide---9000_Volume_I_EN
• ZXMSG_9000(V1.0.05.R03)_Operation_Guide---9000_Volume_II_EN
• ZXMSG_9000(V1.0.05.R03)_Operation_Guide---9000_Volume_II_EN_1
• ZXMSG_9000(V1.0.05.R03)_Operation_Guide---9000_Volume_III_EN
NetNumen U31 R30 Guidance
• NetNumen U31 R30 (V12.11.40) SS1b General Operation Guide(Security
Management Volume)
• NetNumen U31 R30 (V12.11.40) SS1b General Operation Guide
• NetNumen U31 R30 (V12.11.40) SS1b Network Element Management
Command Manual
• NetNumen U31 R30 (V12.11.40) SS1b Product Description
• NetNumen U31 R30 (V12.11.40) SS1b Routine Maintenance Guide
NMSI Guidance
• NetNumen U31 R30 Accouting IMP Commissioning Guide
1.3.2 Logical scope
The logical scope of the TOE is described in Figure 3.
L3 Switch
PSTN
PSTN
Billing
Center
TOE
Environment (In scope)
IP Mgt.
Network
IP Mgt.
Network
EMS Client
PC
PC
NTP
Wireless
Network
Wireless
Network
Telecomm.
IP Network
Telecomm.
IP Network
Alarm
Box
MSG-9000
BOSS NMSI
DB
Server
SS1b
Service
Part
BSVR DB
Server
SS1b
Service
Part
BSVR
LIG
LIC
SS1b
EMS
L3 switch
EMS
L3 switch
Secure
Network
Secure
Network
Boss
Network
Boss
Network
Figure 3: The TOE Scope
14 Confidential and Proprietary Information of ZTE CORPORATION
Security Target ZTE ZXSS10 SS1B and MSG-9000
The functionalities and threats that are assessed are therefore related to:
Secure management of the TOE, to ensure that only properly authorized staff can
manage the TOE (except for lawful interception, BOSS, and billing functionality).
There is one way to manage the TOE:
o Through the EMS Client: This allows full access to management
functionality except for lawful interception3
, BOSS, and billing functionality
Secure management means:
o Proper authentication (who is the user), authorization (what is the user
allowed to do) and auditing (what has the user done)
o Protection of communication between EMS and SS1B, NMSI and SS1B,
and EMS and EMS client against disclosure, undetected modification and
masquerading
Provides secure management of SS1b user profile data, to ensure only properly
authenticated external entities can access SS1b user profile data.
The BOSS interface NMSI provides username/password authentication, to prevent
unauthenticated users to access and modify SS1b user profile data.
Provides secure access of billing data, to ensure only properly authenticated
external entities can access billing data.
The BSVR provides external entities authentication based on username and
password, to prevent unauthenticated external entities to access billing data.
Provides secure interaction between itself and the Billing Center and itself and the
BOSS so that data cannot be read or modified in between
The TOE shall protect communication between
o Billing center and the BSVR
o BOSS and the NMSI
against disclosure, undetected modification and masquerading
Provides secure interaction between itself and NTP, so that the time provided by
NTP can be trusted
3
Users can use EMS client to manage lawful interception configuration of SS, such as
enable/disable LI functionality, LI protocol, and connection to the LIG. But they cannot setup
lawful interception
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Security Target ZTE ZXSS10 SS1B and MSG-9000
The TOE shall protect the communication between NTP and the TOE against
undetected modification and masquerading.
1.3.3 Roles and external entities
See section 5.2.
1.4 Excluded from evaluation
The SS1b is always supplied with McAfee VirusScan 8.5, Norton Anti-virus or
Trend anti-virus4
. The anti-virus is manually updated periodically5
by maintenance
personnel and is excluded in the evaluation. The SS1b provides its own CLI and
GUI interface, but they are all not part of standard TOE configuration and therefore
excluded from evaluation at all during the evaluation and are not allowed to use.
4
Most of the time the McAffee VirusScan 8.5 is supplied. Only in some special cases, such as
request from customers, will the Norton Anti-virus or Trend anti-virus be supplied.
5
It is required to update the virus definition every month
16 Confidential and Proprietary Information of ZTE CORPORATION
Security Target ZTE ZXSS10 SS1B and MSG-9000
2 Conformance Claims
This ST conforms to:
 CC, version 3.1R3, as defined by [CCp1], [CCp2], [CCp3] and [CEMe].
 CC Part 2 as CC Part 2 conformant
 CC Part 3 as CC Part 3 conformant
This ST conforms to no Protection Profile.
This ST conforms to EAL 2+ALC_FLR.2, and to no other packages.
Confidential and Proprietary Information of ZTE CORPORATION 17
Security Target ZTE ZXSS10 SS1B and MSG-9000
3 Security Problem Definition
3.1 Organisational Security Policies
OSP.USERS
The TOE must:
o authenticate Billing Centers, allowing them access the SS1b billing data
o authenticate BOSSes, allowing them to set-up and configure the SS1b
provisioning functionality.
o authenticate EMS users, log their activities, and allow them to set-up
and configure the TOE functionality (except for provisioning functionality)
OSP.COMMUNICATION
o The customer must provide secure network to protect the
communication between the EMS and the MSG-9000 and between
MSG-9000 and SS1b
o The communication between the TOE and LIG and LIC must be
protected against masquerading, disclosure, and modification
3.2 Threats
3.2.1 Assets and threat agents
The assets are:
o The ability to allow various users to manage various aspects of the TOE
securely, especially the lawful interception configuration functionality6
o The confidentiality and integrity of the communication between the TOE
parts:
o EMS and EMS client
o EMS and SS1b
o NMSI and SS1b
o The confidentiality and integrity of the communication between the TOE
and:
o Billing Center
o BOSS
o The integrity of the communication between the TOE and NTP
These assets are threatened by the following threat agents:
1. TA.ROGUE_USER An EMS, BSVR, or BOSS user seeking to act
outside his/her authorization. There are three types:
6
Such as configure the IP address of LIG and LI protocol, but not setup which number is
intercepted
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Security Target ZTE ZXSS10 SS1B and MSG-9000
o TA_ROGUE_USER_EMS: which has legitimate access to the
EMS Client, but not to the BSVR or NMSI
o TA_ROGUE_USER_BSVR: which has legitimate access to the
BSVR, but not to the EMS or NMSI
o TA_ROUGE_USER_BOSS: which has legitimate access to NMSI,
but not to EMS or BSVR
2. TA.NETWORK An attacker with IP-access to the IP-management
networks that the TOE is part of.
3. TA.PHYSICAL An attacker with physical access to the TOE
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Security Target ZTE ZXSS10 SS1B and MSG-9000
3.2.2 Threats
The combination of assets and threats gives rise to the following threats:
T.UNAUTHORISED
TA.ROGUE_USER performs actions on the TOE that he is not authorized to do.
T.AUTHORISED
TA.ROGUE_USER performs actions on the TOE that he is authorized to do, but
these are undesirable7
and it cannot be shown that this user was responsible.
T.UNKNOWN_ USER
TA.NETWORK gains unauthorized access to the TOE and is able to perform
actions on the TOE.
T. NETWORK
TA.NETWORK is able to:
• Modify/read network traffic originating from / destined for the TOE or
• Modify/read network traffic between TOE subsystems
• Impersonate the TOE
and thereby perform management actions on other entities on the network or gain
unauthorized knowledge about TOE traffic.
T.PHYSICAL_ATTACK
TA.PHYSICAL gains physical access to the TOE and is able to perform actions on
the TOE.
3.3 Assumptions
This Security Target uses one assumption:
A.TRUSTED_SYSTEMS
It is assumed that the LIG, Billing Center, and BOSS are trusted, and will not be
used to attack the TOE. It is assumed that no attacks on the TOE will emanate
from the PSTN, the Wireless Network, or IP telecommunication network8
.
7
For example, the user is allowed to modify billing records in case of obvious error, but he
misuses this to delete all billing records.
8
We assumed that attacks such as malicious VoIP will be filtered by other telecommunication
equipments like access gateways or session boarder controller (SBC).
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4 Security Objectives
These security objectives describe how the threats described in the previous
section will be addressed. It is divided into:
 The Security Objectives for the TOE, describing what the TOE will do to
address the threats
 The Security Objectives for the Operational Environment, describing
what other entities must do to address the threats
A rationale that the combination of all of these security objectives indeed
addresses the threats may be found in section 7.1 of this Security Target.
4.1 Security objectives for the TOE
O. AUTHENTICATE_EMS
The TOE shall support EMS Client user authentication, allowing the TOE to
accept/reject EMS users based on username and password.
O. AUTHORISE_EMS
The TOE shall support at least two roles on the EMS Client:
o EMS administrator with all rights
o EMS operator with limited rights
Rights include:
o the ability to perform various management related actions
o the ability to manage (create, modify rights, delete) other EMS users
O.AUDITING_EMS
The TOE shall support logging and auditing of OMM user actions.
O. AUTHENTICATE_BSVR
The TOE shall support billing server authentication, allowing the TOE to
accept/reject billing server based on username and password.
O.AUTHENTICATE_BOSS
The TOE shall support BOSS authentication, allowing the TOE to accept/reject
BOSS based on username and password.
O.SEPARATE_USERS
The TOE shall:
o prohibit EMS users from accessing billing and BOSS related data and
functionality
o prohibit BSVR users from accessing EMS and BOSS related data and
functionality
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o prohibit BOSS users from accessing EMS and billing related data and
functionality
O.PROTECT_COMMUNICATION
The TOE shall:
• protect communication between the TOE and the BOSS against
masquerading, disclosure and modification
• protect communication between the TOE and the Billing Center against
masquerading, disclosure and modification
• protect communication between the Clients and Servers of EMS against
disclosure and modification
• protect communication between the SS1b and the NMSI against
masquerading, disclosure and modification
• protect communication between the SS1b and the EMS against
masquerading, disclosure and modification
• protect communication between the EMS and the NTP against
masquerading and modification
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4.2 Security objectives for the Operational Environment
OE.TIME
The NTP Server connected to the TOE shall supply the TOE with reliable time.
OE.TRUST&TRAIN_USERS
The customer shall ensure that EMS roles are only assigned to users that are
sufficiently trustworthy and sufficiently trained to fulfill those roles.
OE.CLIENT_SECURITY
The customer shall ensure that workstations that host one of the Clients are
protected from physical and logical attacks that would allow attackers to
subsequently:
• Disclose passwords or other sensitive information
• Hijack the client
• Execute man-in-the-middle attacks between client and EMS or similar
attacks.
OE.PROTECTED_LINE_LIC
The customer and the law enforcement authority shall ensure that the connection
between the TOE and LIG and LIC is protected against masquerading, disclosure
and modification.
OE.PROTECT_COMMUNICATION
The customer shall provide secure connection to
• protect communication between MSG-9000 and EMS
• protect communication between MSG-9000 and SS1b
OE.VLAN
The customer shall provide the following networks:
• IP management network
• BOSS network
OE.SERVER_SECURITY
The customer shall ensure that the TOE shall be protected from physical attacks.
OE.TRUSTED_SYSTEMS
The customer shall ensure that the Billing Center, LIG, LIC, and BOSS are trusted,
and will not be used to attack the TOE. The operator shall also ensure that all end-
user level VoIP traffic emanate from the IP telecommunication network are trusted.
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5 Security Requirements
5.1 Extended components definition
This Security Target introduces one extended component: FAU_GEN.3 Simplified
audit data generation. This component is a simplified version of FAU_GEN.1 and is
therefore a suitable member of the FAU_GEN family. It was added to remove the
need to log start and stop of auditing and to simplify the requirement.
FAU_GEN.3 Simplified audit data generation
Hierarchical to: No other components.
Dependencies: FPT_STM.1 Reliable time stamps
FAU_GEN.3.1 The TSF shall be able to generate an audit record of the
following auditable events: [assignment: defined auditable events].
FAU_GEN.3.2 The TSF shall record within each audit record: Date and
time of the event, [assignment: other information about the event].
5.2 Definitions
The following terms are used in the security requirements:
Subjects and external entities
EMS related roles
• EMS Administrator: a role with unrestricted access rights over all resources,
including right to modify critical information of accounts.
• EMS Maintenance: a role with high access rights, but only to resources
assigned to him.
• EMS Operator: a role with limited access rights, but only to resources
assigned to him.
• EMS Supervisor: a role with only viewing rights, but only to resources
assigned to him
• EMS Customized roles: these roles can be defined in the TOE by the
Administrator (or by a configurable role who has the right to create roles)
and have customizable rights.
Billing related roles and external entity
Billing user Users at Billing center who can login BSVR to get CDRs
Billing Center See Figure 3
BOSS related roles and external entity
BOSS See Figure 3
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Note that BOSS itself does not have user interface. The operator shall provide its
own user interface for its user to perform management actions. The
username/password used for BOSS to connect to NMSI is different from the
username/password used for users to login the operator-provided user interface.
None of the roles above has full “root” access to the TOE. This is reserved for ZTE
maintenance staff that regularly service the TOE using the systems console, but
this is out of scope and not described further in this ST.
Objects:
Resource: The softswitch ZXSS10 SS1b and the media gateway MSG-9000
Operations
Operations in the TOE are divided into
• Topology Management
• Fault Management
• Performance Management
• Configuration Management
• Maintenance Management
• Security Management
A more detailed overview of operations may be found in Appendix A. A full list of
operations is outside the scope of this ST, and can be found in the TOE Guidance.
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The following notational conventions are used in the requirements. Operations are
indicated in bold, except refinements, which are indicated in bold italic. In general
refinements were applied to clarify requirements and/or make them more readable.
Iterations were indicating by adding three letters to the component name.
5.3 Security Functional Requirements
The SFRs have been divided into five major groups:
• Identification & Authentication
• Roles & Authorisation
• Logging & Auditing
• Communication
• Management
5.3.1 Identification & Authentication
FIA_UID.2.EMS User identification before any action
FIA_UID.2.1 The EMS shall require each EMS-user to be successfully
identified
• by username (in all cases), and
• by IP-address (if so configured for that user)
• by MAC-address (if so configured for that user)
and ensure that the user is allowed to login at this time (if so
configured for that user) before allowing any other TSF-mediated
actions on behalf of that user.
FIA_UID.2.BOS User identification before any action
FIA_UID.2.1 The NMSI shall require each BOSS to be successfully
identified
• by username
before allowing any other TSF-mediated actions on behalf of that
user.
FIA_UID.2.BIL User identification before any action
FIA_UID.2.1 The BSVR shall require each Billing Center to be
successfully identified
• by username
before allowing any other TSF-mediated actions on behalf of that
user.
FIA_UAU.2.EMS User authentication before any action
FIA_UAU.2.1 The EMS shall require each EMS-user to be successfully
authenticated by password before allowing any other TSF-mediated
actions on behalf of that user.
FIA_UAU.2.BOS User authentication before any action
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FIA_UAU.2.1 The NMSI shall require each BOSS to be successfully
authenticated by password before allowing any other TSF-mediated
actions on behalf of that user.
FIA_UAU.2.BIL User authentication before any action
FIA_UAU.2.1 The BSVR shall require each Billing Center to be
successfully authenticated by password before allowing any other
TSF-mediated actions on behalf of that user.
FTA_SSL.3 TSF-initiated termination
FTA_SSL.3.1 The EMS shall terminate an EMS interactive session
• when9
the allowed work time (if so configured for that
user) expires, or
• when one of the user roles is being locked while he is
logged in.
FIA_AFL.1 Authentication failure handling
FIA_AFL.1.1 The EMS shall detect when an EMS-administrator
configurable positive integer within 2-3 unsuccessful
authentication attempts occur related to the same user account.
FIA_AFL.1.2 When the defined number of unsuccessful authentication
attempts has been met, the EMS shall lock the EMS-user
account10
• until unlocked by the administrator, or
• until an administrator configurable positive integer within
[24-infinity] of hours have passed, if the account has not
been set to permanent locking.
FIA_SOS.1 Verification of secrets
FIA_SOS.1.1 The TSF shall provide a mechanism to verify that EMS
passwords meet:
• At least 6 characters including three of the four types:
number, small letter, capital letter, other characters
• cannot be the same as the user name, the user name
twice11
, the username in reverse12
or a common
dictionary word
• can be configured to expire after a configurable amount
of time < 180 days
• can be configured to be different from the previous 5 or
more passwords when changed
9
The sentence was refined to make it more readable.
10
Unless this account has been set to unlockable.
11
If the username is chang, “changchang” is not allowed.
12
If the username is chang, “gnahc” is not allowed
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FTA_MCS.1 Basic limitation on multiple concurrent sessions
FTA_MCS.1.1 The TSF shall restrict the maximum number of concurrent
sessions that belong to the same EMS-user.
FTA_MCS.1.2 The TSF shall enforce, by default, a limit of 1 sessions
per user and no more than 200 sessions for all users together.
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5.3.2 Roles & Authorisation
FMT_SMR.1 Security roles
FMT_SMR.1.1 The EMS shall maintain the roles:
• Administrator
• Maintenance
• Operator
• Supervisor
• customized roles.
FMT_SMR.1.2 The TSF shall be able to associate users with one or
more roles.
FDP_ACC.2 Complete access control
FDP_ACC.2.1 The EMS shall enforce the Role Policy on all roles and
resources and all operations among roles and resources and the
TOE.
FDP_ACC.2.2 The EMS shall ensure that all operations between any
role and any resource are covered by an access control SFP.
FDP_ACF.1 Security attribute based access control
FDP_ACF.1.1 The EMS shall enforce the Role Policy to objects based
on the following: all roles, all resources13
.
FDP_ACF.1.2 The EMS shall enforce the following rules to determine if
an operation among roles and resources and the TOE is allowed:
• for the roles Administrator, Maintenance, Operator and
Supervisor, as defined in Appendix A14
• for the customized roles, as defined by their
customization15
• the Administrator and appropriately customized roles
can perform the functions in FMT_SMF.116
• if a user has multiple roles, it is sufficient if only one role
is allowed to do the operation
• while a role is locked no user has this role
FDP_ACF.1.3 (refined away).
FDP_ACF.1.4 The TSF shall explicitly deny access of subjects to objects
based on the following additional rules:
• BOSS cannot perform Billing and EMS actions
• Billing users cannot perform BOSS and EMS actions
13
The attributes have been refined away as there are no relevant attributes.
14
These pre-defined roles are local to the EMS only
15
Roles that can perform operations on SS1b or MSG-9000 are all customized roles
16
Note that these are also among the functions defined in Appendix A, but the list at FMT_SMF.1
is in more detail as it is more relevant to the security of the TOE.
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• EMS users cannot perform Billing and BOSS actions
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5.3.3 Logging & Auditing
The TOE maintains 3 separate logs:
• A security log for authentication events
• An operation log for operations performed by users
• A system log for EMS server tasks that are not directly related to users
performing operations
FAU_GEN.3.EMS Simplified audit data generation
FAU_GEN.3.1 The EMS shall be able to generate an audit record of the
following auditable events:
In the security log:
• authentication success/failure
• EMS user account is locked
• EMS user account is unlocked
• EMS user account is enabled
• EMS user account is disabled
FAU_GEN.3.2 The EMS shall record within each security audit record
at least the following information:
• Date and time of the event
• EMS user name
• Type of event
• Host address
• Operation time
• login details
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FAU_SAR.1 Audit review
FAU_SAR.1.1 The EMS shall provide Administrator and suitably
customized roles with the capability to read security log from the
audit records.
FAU_SAR.1.2 The EMS shall provide the audit records in a manner
suitable for the user to interpret the information.
FAU_STG.1 Protected audit trail storage
FAU_STG.1.1 The EMS shall protect the stored audit records in the
audit trail from unauthorised deletion.
FAU_STG.1.2 The EMS shall be able to prevent unauthorised
modifications to the stored audit records in the audit trail.
FAU_STG.4 Prevention of audit data loss
FAU_STG.4.1 The EMS shall overwrite the oldest stored audit
records17
if the audit trail is full.
17
The operation was completed to “take no other actions”, and this was subsequently refined
away to make the sentence more readable.
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5.3.4 Communication
FDP_ITT.1.EMS Basic internal transfer protection
FDP_ITT.1.1 The TSF shall18
prevent the disclosure or modification
of all data when it is transmitted between the EMS Client and the
EMS Server.
FDP_ITT.1.SS Basic internal transfer protection
FDP_ITT.1.1 The TSF shall19
prevent the disclosure or modification
of all data when it is transmitted between the EMS and the SS1b.
FDP_ITT.1.NMSI Basic internal transfer protection
FDP_ITT.1.1 The TSF shall20
prevent the disclosure or modification
of all data when it is transmitted between the NMSI and the SS1b.
FTP_ITC.1.BOS Inter-TSF trusted channel
FTP_ITC.1.1 The NMSI shall provide a communication channel between
itself and BOSS 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 NMSI shall permit the NMSI and the BOSS to initiate
communication via the trusted channel.
FTP_ITC.1.3 (refined away)21
FTP_ITC.1.BIL Inter-TSF trusted channel
FTP_ITC.1.1 The BSVR shall provide a communication channel
between itself and Billing Center 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 BSVR shall permit the BSVR and the Billing Center
to initiate communication via the trusted channel.
FTP_ITC.1.3 (refined away)22
FTP_ITC.1.NTP Inter-TSF trusted channel
FTP_ITC.1.1 The TSF shall provide a communication channel between
itself and NTP server with MD5 authentication that is logically
distinct from other communication channels and provides assured
identification of its end points and protection of the communicated
18
Reference to policy refined away since the policy would simply restate the requirement
19
Reference to policy refined away since the policy would simply restate the requirement
20
Reference to policy refined away since the policy would simply restate the requirement
21
NMSI does not initiate communication
22
BSVR does not initiate communication
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data from modification or disclosure.
FTP_ITC.1.2 The TSF shall permit the TSF to initiate communication via
the trusted channel.
FTP_ITC.1.3 The TSF shall initiate communication via the trusted
channel for time synchronization.
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5.3.5 Management
FMT_SMF.1 Specification of Management Functions
FMT_SMF.1.1 The TSF shall be capable of performing the following
management functions:
Management function Related to
SFR23
Set whether an EMS user can only login from
certain IP-addresses, and if so, which IP addresses
FIA_UID.2.EMS
Set whether an EMS user can only login from
certain MAC-addresses, and if so, which MAC-
addresses
FIA_UID.2.EMS
Set whether an EMS user can only login at certain
times, and if so, at which times
FIA_UID.2.EMS
Set the time that an EMS user may remain logged in
while inactive
FTA_SSL.3
Set whether an EMS user is only allowed to work at
certain times, and if so, at which times
FTA_SSL.3
Set the number of allowed unsuccessful
authentication attempts for EMS
FIA_AFL.1
Set the number of hours that an EMS account
remains locked
FIA_AFL.1
Set whether an EMS user account should be:
o unlockable, or
o locked (either permanently or temporarily)
when it exceeds the number of allowed
consecutive unsuccessful authentication
attempts
FIA_AFL.1
Unlock an EMS user account FIA_AFL.1
Set whether an EMS user password expires after a
certain time, and if so, after how long
FIA_SOS.1
FIA_SOS.1
Set whether the new password of an EMS user
must be different from the last n passwords when
the password is changed by the user and configure
n
Set the maximum number of concurrent sessions
for the same user
FTA_MCS.1
Create, edit and delete customized roles FMT_SMR.1
Add or remove roles to/from users FMT_SMR.1
Add or delete types of events to be logged in the
security log
FAU_GEN.3.1
-
Create, edit and delete user accounts
Disable/enable24
user accounts -
23
This column of the table is for reference only, and is not part of the SFR.
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Lock/unlock25
roles -
24
The effect is the same as locking of an EMS user account, but disabling is actively done by the
administrator, while locking an EMS user account is done by failing to authenticate too many
times.
25
Locking and unlocking roles is done by the administrator. The effect is that any EMS user with
that role loses all access rights provided by that role, unless he has those rights also by a non-
locked role.
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5.4 Security Assurance Requirements
The assurance requirements are EAL2+ALC_FLR.2 and have been summarized in
the following table:
Assurance Components
Assurance Class
Identifier Name
ADV_ARC.1 Security architecture description
Security-enforcing functional
specification
ADV_FSP.2
ADV: Development
ADV_TDS.1 Basic design
AGD_OPE.1 Operational user guidance
AGD: Guidance
documents AGD_PRE.1 Preparative procedures
ALC_CMC.2 Use of a CM system
ALC_CMS.2 Parts of the TOE CM coverage
ALC_DEL.1 Delivery procedures
ALC: Life-cycle support
ALC_FLR.2 Flaw reporting procedures
ASE_CCL.1 Conformance claims
ASE_ECD.1 Extended components definition
ASE_INT.1 ST introduction
ASE_OBJ.2 Security objectives
ASE_REQ.2 Derived security requirements
ASE_SPD.1 Security problem definition
ASE: Security Target
evaluation
ASE_TSS.1 TOE summary specification
ATE_COV.1 Evidence of coverage
ATE_FUN.1 Functional testing
ATE: Tests
ATE_IND.2 Independent testing - sample
AVA: Vulnerability
assessment
AVA_VAN.2 Vulnerability analysis
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5.5 Security Assurance Requirements Rationale
The Security Assurance Requirements for this Security Target are
EAL2+ALC_FLR.2. The reasons for this choice are that:
 EAL 2 is deemed to provide a good balance between assurance and
costs and is in line with ZTE customer requirements.
 ALC_FLR.2 provides assurance that ZTE has a clear and functioning
process of accepting security flaws from users and updating the TOE
when required. This is also in line with ZTE customer requirements.
 The refinements are derived from ZTE customer requirements as well.
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6 TOE Summary Specification
Secure management of the TOE, to ensure that only properly authorized staff can
manage the TOE (except for lawful interception, BOSS, and billing functionality).
FIA_UID.2.EMS, FIA_UAU.2.EMS, FIA_AFL.1
Whenever an EMS user of the TOE wishes to use the EMS to manage the TOE,
the user needs to use the EMS client of the TOE. The first action required by the
user is then to log-in.
The TOE allows the appropriate administrator to configure (for each EMS user),
how that user must log-in:
• The user must always provide a username and a password
• Whether the user can only login from a predefined IP-address
• Whether the user is only allowed to be logged in during a certain time
interval (e.g. office hours)
• Whether an account is unlockable or not, and when an account is not
unlockable:
o how many times a user can fail consecutive authentication
attempts before that account is locked
o how the account is unlocked by the Administrator or until a
predefined time elapses
FTA_MCS.1
Even if all of the above is correct, the user can still be denied access when:
• the user is already logged in
• too many other users are already logged in
FTA_SSL.3
The EMS will log an EMS user out when:
• The Administrator locks one of the roles that that user currently has. The
user can subsequently log in again, but he will not have that role.
• The user is only allowed to be logged in during a certain time interval, and
this interval expires.
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FIA_SOS.1
Whenever the EMS user has to provide a new password to the TSF, these
passwords have to meet certain rules to ensure that the passwords cannot be
easily guessed or broken by brute force. Passwords that do not meet these rules
are rejected by the TOE.
FMT_SMR.1, FDP_ACC.2, FDP_ACF.1, FMT_SMF.1
The TOE provides a set of roles that can be assigned to users. The users can then
use these roles to perform the actions (including various management actions)
allowed by the roles.
FAU_GEN.3, FAU_SAR.1, FAU_STG.1, FAU_STG.4
Activities of the EMS users are logged, and only certain roles are allowed to view
the logs. The logs cannot be edited. They can only be deleted by the respective
administrators (or a suitably customized role) and then only when they are 30 days
old or older. When they fill up they overwrite themselves.
FDP_ITT.1.EMS
The communication between the EMS and the EMS client is protected by SSH and
SFTP
FDP_ITT.1.SS
The communication between the EMS and SS1b is protected by SSH and SFTP
FDP_ITT.1.NMSI
The communication between the SS1b and the NMSI is protected by SSH and
SFTP
Provides secure management of SS1b user profile data, to ensure only properly
authenticated external entities can access SS1b user profile data.
FIA_UID.2.BOS and FIA_UAU.2.BOS
Whenever a BOSS wishes to manage the user profile, the BOSS need to identify
and authenticate itself to the NMSI.
Provides secure access of billing data, to ensure only properly authenticated
external entities can access billing data.
FIA_UID.2.BIL and FIA_UAU.2.BIL
Whenever a billing server wishes to fetch the CDR from the BSVR, the billing
server need to identify and authenticate itself to the BSVR.
Provides secure interaction between itself and the Billing Center and itself and the
BOSS so that data cannot be read or modified in between
FTP_ITC.1.BIL
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The communication between the billing center and the BSVR is protected by sftp.
FTP_ITC.1.BOS
The communication between the BOSS and the NMSI is protected by SSH
Provides secure interaction between itself and NTP, so that the time provided by
NTP can be trusted
FTP_ITC.1.NTP
The communication between the TOE and the NTP is protected by MD5
authentication.
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7 Rationales
7.1 Security Objectives Rationale
Assumptions/OSPs/Threats Objectives
OSP.USERS
The TOE must:
o authenticate Billing centers, allowing them
access SS1b billing data
o authenticate BOSS users, allowing them to set-
up and configure the SS1b provisioning
functionality
o authenticate EMS users, log their activities, and
allow them to set-up and configure the TOE
functionality (except for provisioning
functionality)
This OSP is primarily implemented by:
• O.AUTHENTICATE_BSVR restate the first bullet
• O.AUTHENTICATE_BOSS restate the second
bullet
• the combination of O.*_EMS, that together restate
the third bullet.
Additionally, to perform logging, the TOE must have a time
source. OE.TIME states that this time source will be an
external NTP Server connected to the TOE.
OSP.COMMUNICATION
o The customer must provide secure network to
protect the communication between the EMS
and the MSG-9000 and between MSG-9000
and SS1b.
o The communication between the TOE and LIG
and LIC must be protected against
masquerading, disclosure, and modification.
This OSP is primarily implemented by
• OE.COMMUNICATION which states that the
communication between the EMS and the SS1b
shall be protected by secure network.
• OE_PROTECTED_LINE_LIC which restates the
second bullet
T.UNAUTHORISED
TA.ROGUE_USER performs actions on the TOE that
he is not authorized to do.
This threat is countered by the following security objectives:
• OE.TRUST&TRAIN that ensures that only users
that are properly trusted and trained will be able to
gain access to certain roles
• O.AUTHENTICATE_* that ensures users are
properly authenticated so the TOE knows which
roles they have
• O.AUTHORISE_* that ensures users with certain
roles have rights to do certain actions for a certain
group of functionality (EMS).
• O.SEPARATE_USERS that ensures that users
without rights for certain functionality groups cannot
access that functionality.
So the only way that a user can perform a management
action for a functionality is when he has a role for that
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Security Target ZTE ZXSS10 SS1B and MSG-9000
functionality, and the only way he can get this role is if he is
properly trained and trusted. Therefore this threat is
countered.
T.AUTHORISED
TA.ROGUE_USER performs actions on the TOE that
he is authorized to do, but these are undesirable and it
cannot be shown that this user was responsible.
This threat is countered by:
• OE.TRUST&TRAIN that ensures that only users
that are properly trusted and trained will be able to
gain access to certain roles. This should go a long
way to prevent the threat from being realized.
• Should this prove insufficient, O.AUDITING_EMS
will ensure that the actions of the user can be
traced back to him.
Together these security objectives counter the threat.
T.UNKNOWN_USER
TA.NETWORK gains unauthorized access to the TOE
and is able to use its functionality.
This threat is countered by:
• OE.CLIENT_SECURITY, preventing the attacker
to gain access to the clients
• O.AUTHENTICATE_*, preventing the attacker to
gain access to the TOE
Together these two security objectives counter the threat.
T. NETWORK
TA.NETWORK is able to:
• Modify/read network traffic originating from
/ destined for the TOE or
• Modify/read network traffic between TOE
subsystems
• Impersonate the TOE
and thereby perform management actions on other
entities on the network or gain unauthorized
knowledge about the TOE traffic.
This threat is countered by O.PROTECT_COMMUNICATION
that protects traffic between:
o EMS and EMS client
o EMS and SS1b
o NMSI and SS1b
o BSVR and the Billing Center
o NMSI and the BOSS
o NTP and EMS
OE.PROTECTED_COMMUNICATION that protects traffic
between
o EMS and MSG-9000
o SS1b and MSG-9000
and OE_PROTECTED_LIE_LIC that protects traffic between
o SS1b and LIG and LIC
and OE_VLAN prevents unauthorized management
knowledge about the TOE traffic leak from the BOSS
network.
Therefore this threat is countered.
T.PHYSICAL_ATTACK
TA.PHYSICAL gains physical access to the TOE
(either client or server) and is able to use its
functionality.
This threat is countered by two security objectives:
• OE.SERVER_SECURITY stating that the TOE part
of the TOE must be protected from physical attack
• OE.CLIENT_SECURITY stating that the client part
of the TOE must be protected from physical attack.
Together these two counter the entire threat.
A.TRUSTED_SYSTEMS
It is assumed that the LIG, Billing Center, and BOSS
This assumption is upheld by the objective
OE.TRUSTED_SYSTEMS which restates the assumption.
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Security Target ZTE ZXSS10 SS1B and MSG-9000
are trusted, and will not be used to attack the TOE. It
is also assumed that no attacks on the TOE will
emanate from the PSTN, the Wireless Network, or IP
telecommunication network.
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Security Target ZTE ZXSS10 SS1B and MSG-9000
7.2 Security Functional Requirements Rationale
Security objectives SFRs addressing the security
objectives
O. AUTHENTICATE_EMS
The TOE shall support EMS Client user authentication,
allowing the TOE to accept/reject EMS users based on
username and password.
This objective is met by:
• FIA_UID.2.EMS stating that
identification will be done by
username, but also IP-address, MAC-
address, and login time
• FIA_UAU.2.EMS stating that the users
must be authenticated
• FIA_SOS.1 stating that passwords
must have a minimum quality
• FIA_AFL.1 stating what happens
when authentication fails repeatedly
• FTA_SSL.3 logging users off when
they are no longer allowed to work or
when their role is locked
• FMT_SMF.1 configuring all of the
above.
Together, these SFRs meet the objective in a
flexible and configurable manner.
O. AUTHENTICATE_BSVR
The TOE shall support billing server authentication, allowing
the TOE to accept/reject billing server based on username
and password.
This objective is met by:
• FIA_UID.2.BIL stating that
identification will be done by
username
• FIA_UAU.2.BIL stating that the billing
server must be authenticated
Together, these SFRs meet the objective.
O.AUTHENTICATE_BOSS
The TOE shall support BOSS authentication, allowing the
TOE to accept/reject BOSS based on username and
password.
This objective is met by:
• FIA_UID.2.BOS stating that
identification will be done by
username
• FIA_UAU.2.BOS stating that the
BOSS must be authenticated
Together, these SFRs meet the objective.
O. AUTHORISE_EMS
The TOE shall support at least two roles on the EMS Client:
o EMS administrator with all rights
o EMS operator with limited rights
Rights include:
This objective is met by:
 FMT_SMR.1 stating the predefined and
customizable roles.
 FDP_ACC.2 and FDP_ACF.1 defining a
Role Policy, which states how the two
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Security Target ZTE ZXSS10 SS1B and MSG-9000
Security objectives SFRs addressing the security
objectives
o the ability to perform various management
related actions
o the ability to manage (create, modify rights,
delete) other OMM users
roles manage the TOE.
 FMT_SMF.1 configuring all of the above.
Together, these SFRs support a flexible
authorization framework.
O.SEPARATE_USERS
The TOE shall:
o prohibit EMS users from accessing billing and
BOSS related data and functionality
o prohibit BSVR users from accessing EMS and
BOSS related data and functionality
o prohibit BOSS users from accessing EMS and
billing related data and functionality
This objective is met by FDP_ACC.2 and
FDP_ACF.1. FDP_ACF.1.4 specifically forbids
the actions listed in the security objective.
O.AUDITING_EMS
The TOE shall support logging and auditing of EMS user
actions.
This objective is met by:
• FAU_GEN.3 showing which events
are logged in the security and system
logs
• FAU_SAR.1 showing that the logged
events can be audited and by whom
• FAU_STG.1 showing how the audit
logs are protected
• FAU_STG.4 stating what happens
when the audit log becomes full
• FMT_SMF.1 configuring all of the
above
Together, these SFRs support a flexible logging
and auditing framework.
O.PROTECT_COMMUNICATION
The TOE shall:
• protect communication between the TOE and the
BOSS against masquerading, disclosure and
modification
• protect communication between the TOE and the
Billing Center against masquerading, disclosure
and modification
• protect communication between the Clients and
the EMS against disclosure and modification
• protect communication between the SS1b and
the EMS against disclosure and modification
• protect communication between the SS1b and
the NMSI against disclosure and modification
• protect communication between the SS1b and
This objective is met by:
• FTP_ITC.1.BOS restating the first
bullet
• FTP_ITC.1.BIL restating the second
bullet
• FDP_ITT.1.EMS restating the third
bullet
• FDP_ITT.1.SS restating the fourth
bullet
• FDP_ITT.1.NMSI restating the fifth
bullet
• FTP_ITC.1.NTP restating the sixth
bullet
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Security objectives SFRs addressing the security
objectives
the NTP against masquerading and modification
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Security Target ZTE ZXSS10 SS1B and MSG-9000
7.3 Dependencies
SFR Dependencies
FIA_UID.2.EMS -
FIA_UID.2.BOS -
FIA_UID.2.BIL -
FIA_UAU.2.EMS FIA_UID.1: met by FIA_UID.2.EMS
FIA_UAU.2.BOS FIA_UID.1: met by FIA_UID.2.BOS
FTA_SSL.3 -
FIA_AFL.1 FIA_UAU.1: met by FIA_UAU.2.EMS
FIA_SOS.1 -
FTA_MCS.1 FIA_UID.1: met by FIA_UID.2.EMS
FMT_SMR.1 FIA_UID.1: met by FIA_UID.2.EMS
FDP_ACC.2 FDP_ACF.1: met
FDP_ACF.1 FDP_ACC.1: met by FDP_ACC.2
FMT_MSA.3: not met, as the policy does not use security attributes,
management of these attributes is unnecessary.
FAU_GEN.3 FPT_STM.1: met in environment by OE.TIME
FAU_SAR.1 FAU_GEN.1: met by FAU_GEN.3, which is similar enough to FAU_GEN.1 to
meet the dependency
FAU_STG.1 FAU_GEN.1: met by FAU_GEN.3, which is similar enough to FAU_GEN.1 to
meet the dependency
FAU_STG.4 FAU_GEN.1: met by FAU_GEN.3, which is similar enough to FAU_GEN.1 to
meet the dependency
FDP_ITT.1.EMS FDP_ACC.1 or FDP_IFC.1: not met, since the policy was refined away the
dependency is unnecessary
FDP_ITT.1.SS FDP_ACC.1 or FDP_IFC.1: not met, since the policy was refined away the
dependency is unnecessary
FDP_ITT.1.NMSI FDP_ACC.1 or FDP_IFC.1: not met, since the policy was refined away the
dependency is unnecessary
FTP_ITC.1.BOS -
FTP_ITC.1.BIL -
FMT_SMF.1 -
SAR Dependencies
EAL 2 All dependencies within an EAL are satisfied
ALC_FLR.2 -
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A Roles and Operations
This Appendix provides a graphical overview of which roles can do what operations
for the various roles
A.1 Administrator
A.2 Maintenance
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Security Target ZTE ZXSS10 SS1B and MSG-9000
A.3 Operator
A.4 Supervisor
50 Confidential and Proprietary Information of ZTE CORPORATION