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Mobile Billing System Security Target - PDF
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1 Mobile Billing System Security Target Common Criteria: EAL1 Version MAY 11
2 Document management Document identification Document ID Document title Product version IDV_EAL1_ASE IDOTTV Mobile Billing System Security Target Mobile Billing System (version 1.4) consists of: Mobile Billing Webtool (version 1.4) Mobile Billing Applet (version 1.0) Mobile Billing Server (version 1.0) Document history Version Date Description SEP 10 Release for internal review DEC 10 Updated to address EOR JAN 11 Updated to address CAR MAR 11 Updated to address minor changes for Product Version MAY 11 Initial Release MAY 11 Minor update on Glossary MAY 11 Minor update. 2 of 27
3 Table of Contents 1 Security Target introduction (ASE_INT) ST and TOE identification Document organization TOE overview TOE description Conformance Claim (ASE_CCL) Security objectives (ASE_OBJ) Overview Security objectives for the environment Security requirements (ASE_REQ) Overview SFR conventions Security functional requirements Dependency analysis TOE security assurance requirements Assurance measures TOE summary specification (ASE_TSS) Overview Glossary of 27
4 1 Security Target introduction (ASE_INT) 1.1 ST and TOE identification ST Title ST Version TOE Reference IDOTTV Mobile Billing System Security Target 1.2, 25 MAY 11 Mobile Billing System (version 1.4) consists of: Mobile Billing Webtool (version 1.4) Mobile Billing Applet (version 1.0) Mobile Billing Server (version 1.0) TOE Version Version 1.4 Assurance Level CC Identification EAL1 Common Criteria for Information Technology (IT) Security Evaluation, Version 3.1, July 2009, incorporating: Part One Introduction and General Model, Revision Three, July 2009; Part Two Security Functional Components, Revision Three, July 2009; and Part Three Security Assurance Components, Revision Three, July Document organization This document is organized into the following sections: Section 1 provides the introductory material for the ST as well as the TOE description including the physical and logical scope of the TOE. Section 2 provides the conformance claims for the evaluation. Section 3 defines the security objectives for the environment. Section 4 contains the functional and assurance requirements derived from the Common Criteria, Part 2 and 3, respectively that must be satisfied by the TOE. 4 of 27
5 Section 5 provides a summary of the TOE specification, identifying the IT security functions provided by the TOE Section 6 provides the glossary for the ST. 1.3 TOE overview TOE type and usage Mobile Billing System consists of a mobile application (Mobile Billing Applet Version 1.0) that facilitates secured, confidential and paperless billing service between service provider and customers which is installed on a user s mobile device and the Mobile Billing Server (Version 1.0). Instead of relying on paper and intermediaries, Mobile Billing delivers bill statement and requested usage information directly to mobile devices. It also features a mobile payment function that enables customers to make bill payment via mobile device. The TOE is comprised of three key components: Mobile Billing Applet. A java based mobile application developed specifically for the Blackberry mobility platform. The application provides a subscriber with the basis for integrating with the mobile billing server. Mobile Billing Server. An application that provides: o o o connectivity to the billing systems of telecommunications providers, a connection to the mobile billing applet application that provides subscribers with system connectivity. Storing data for the TOE. Mobile Billing Webtool. a web based interface for both subscribers and telecommunication administrators to login and manage their accounts or the system. The TOE is Mobile Billing System version 1.4 and is referred to as Mobile Billing System in this document TOE security functions The following table highlights the range of security functions and features implemented by the TOE. 5 of 27
6 Security function Identification and Authentication Security Management User Data Protection Secure Communication Description The TOE provides identification and authentication of users of the TOE. The TOE provides security management through the use of the Web Administration Interface as well as through the applet installed on mobile devices. The TOE provides its own access control between subjects and objects covered by the Access Control SFP. The TOE is able to protect the billing information from disclosure and modification when the scanned data is sent from Mobile Billing server to the applet application. 1.4 TOE description Physical scope of the TOE The TOE comprises the Mobile Billing System. This consists of the applet that is installed on any Javaenabled mobile device as well as the Mobile Billing Server. A typical installation of the TOE can be found in Figure 1 below. Figure 1 Mobile Billing System Deployment Telecommunication administrator will login to the TOE through a web admin interface. For subscribers, they will download and install the applet and access their billing information through the application. 6 of 27
7 The mobile application can be installed on any Java Enabled mobile devices. The Mobile Billing Server runs Apache HTTP Server Version 2.0 on a Linux operating system Logical scope of the TOE The logical boundaries of the TOE include the functions of the TOE interfaces. These functions include identification and authentication, security management, User Data Protection and secure communication. Identification & Authentication. When a user issues a request to the TOE to access the billing information, the TOE requires that the user identify and authenticate themselves before performing any TSF mediated action on behalf of the user. The TOE checks the credentials presented by the user upon the login page against the authentication information in the database. User Data Protection. The access control function permits a user to access the billing information only if a userid or role of the user has permission to access the information. Access rules are stored in Access Control Lists associated with each object in the TSC. Security Management. The TOE contains various user management functions to ensure efficient and secure management of the TOE: The TOE maintains four roles within the TOE to ensure that the functions are restricted to only those users that need to have access to privileged functions. The roles maintained by the TOE are: Telecommunication Employee, Telecommunication Administrator, Mobile Subscriber and Super Administrator. The functions above, and indeed, aspects of these functions, are restricted based on these roles. Secure Communication. The TOE provides a secure communication channel between the applet application and the Mobile Billing server when billing information is sent from the server. 7 of 27
8 2 Conformance Claim (ASE_CCL) The ST and TOE are conformant to version 3.1 (Revision 3) of the Common Criteria for Information Technology Security Evaluation. The following conformance claims are made for the TOE and ST: Part 2 conformant. Conformant with Common Criteria for Information Technology Security Evaluation Part 2: Security functional requirements, version 3.1, Revision 3. Part 3 conformant. Conformant with Common Criteria for Information Technology Security Evaluation Part 3: Security assurance requirements, version 3.1, Revision 3. Evaluation is EAL1. 8 of 27
9 3 Security objectives (ASE_OBJ) 3.1 Overview The security objectives at an EAL1 level of assurance include concise statements of the objectives to be achieved by the supporting environment. 3.2 Security objectives for the environment Identifier OE.ENVIRONMENT OE.ADMIN OE.PHYSICAL OE.DATABASE OE.MANAGEMENT OE.NETWORK OE.PATCH Objective statements Those responsible for the TOE must ensure that appropriate authentication and authorisation controls for all users and administrators in the underlying environment (including the Operating System, RDBMS, and Web Server) The owners of the TOE must ensure that the super administrators and telecommunication administrator who manages the TOE is not hostile and is competent. Those responsible for the TOE must ensure that the IT environment provides the TOE with appropriate physical security, commensurate with the value of the IT assets protected by the TOE. Those responsible for the TOE must ensure that the databases in the TOE environment have been correctly configured according to the principle of least privilege. Those responsible for the TOE must ensure that all management of the TOE is performed through the management interfaces of the TOE and not through the underlying environment. Those responsible for the TOE must ensure that appropriate network layer protection, that there is a firewall in place that only permits access through required ports for external users to access the web server. Those responsible for the TOE must ensure that the underlying operating system, web server, application server and DBMSs and are patched and hardened to protect against known vulnerabilities and security configuration 9 of 27
10 issues. OE.COMMUNICATION Those responsible for the TOE must ensure that the web server has SSL certificates installed and are valid (not revoked or expired), are sourced from a trusted entity. 10 of 27
11 4 Security requirements (ASE_REQ) 4.1 Overview This section defines the security requirements satisfied by the TOE. Each requirement has been extracted from version 3.1 of the Common Criteria, part 2 providing functional requirements and part 3 providing assurance requirements. 4.2 SFR conventions 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: 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]. 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]. 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. 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. 11 of 27
12 4.3 Security functional requirements Overview The security functional requirements are expressed using the notation stated in Section 4.2 and summarized in the table below. Identifier FCS_COP.1 FDP_ACC.1 FDP_ACF.1 FIA_UAU.2 FIA_UID.2 FMT_MSA.1 FMT_MSA.3 FMT_MTD.1 FMT_SMF.1 FMT_SMR.1 FTP_ITC.1 Title Cryptographic operation Subset access control Security attribute based access control User authentication before any action User identification before any action Management of security attributes Static attribute initialisation Management of security functions behaviour Specification of Management Functions Security roles Inter TSF trusted channel 12 of 27
13 4.3.2 FCS_COP.1 Cryptographic Operation Hierarchical to: FCS_COP.1.1 Dependencies: No other components. The TSF shall perform [secure hashing] in accordance with a specified cryptographic algorithm [MD5] and cryptographic key sizes [none] that meet the following: [FIPS 180 2]. [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 Notes: This cryptographic operation does not use key. The password of the users is hashed and compare with the values stored in the authentication data database FDP_ACC.1 Subset access control Hierarchical to: No other components. FDP_ACC.1.1 The TSF shall enforce the [Access Control SFP] on [ Subjects: a) Telecommunication Employees, Telecommunication administrator, super administrator and mobile subscriber Objects: a) Billing information Operations: ] a) Retrieving of user billing information for viewing Dependencies: Notes: FDP_ACF.1 Security attribute based access control Mobile Subscriber can only see their billing information using Mobile Billing Applet. Telecommunication Administrator and Super Administrator can see all the billing information using Mobile Billing Webtool. For Telecommunication Employee, it will be up to the Telecommunication Administrator or Super 13 of 27
14 Administrator to configure the access FDP_ACF.1 Security attribute based access control Hierarchical to: No other components. FDP_ACF.1.1 The TSF shall enforce the [Access Control SFP] to objects based on the following: [ Subject attribute: a) ID of the user b) corresponding user role/level Object attributes: a) Access Control List ] FDP_ACF.1.2 The TSF shall enforce the following rules to determine if an operation among controlled subjects and controlled objects is allowed: [ The operation is allowed, if: ] a) The Access Control List for an object permits the user ID to access that object; OR b) The Access Control List for an object permits the User Role to access that Object. FDP_ACF.1.3 FDP_ACF.1.4 Dependencies: The TSF shall explicitly authorise access of subjects to objects based on the following additional rules: [the Telecommunication administrator role and super administrator role can access all records]. The TSF shall explicitly deny access of subjects to objects based on the following additional rules: [None]. FDP_ACC.1 Subset access control FMT_MSA.3 Static attribute initialisation Notes: None. 14 of 27
15 4.3.5 FIA_UAU.2 User authentication before any action Hierarchical to: FIA_UAU.2.1 Dependencies: Notes: FIA_UAU.1 Timing of authentication The TSF shall require each user to be successfully authenticated before allowing any other TSF mediated actions on behalf of that user. FIA_UID.1 Timing of identification None FIA_UID.2 User identification before any action Hierarchical to: FIA_UID.2.1 Dependencies: Notes: FIA_UID.1 Timing of identification The TSF shall require each user to be successfully identified before allowing any other TSF mediated actions on behalf of that user. No dependencies. None FMT_MSA.1 Management of security attributes Hierarchical to: FMT_MSA.1.1 Dependencies: No other components. The TSF shall enforce the [Access Control SFP] to restrict the ability to [write or delete] the security attributes [None]. [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: Subscribers will have access to their own account bills using Mobile Billing Applet and telecommunication administrators can see all the information of users using the Mobile Billing Webtool. 15 of 27
16 4.3.8 FMT_MSA.3 Static attribute initialisation Hierarchical to: FMT_MSA.3.1 FMT_MSA.3.2 Dependencies: No other components. The TSF shall enforce the [Access Control SFP] to provide [restrictive] default values for security attributes that are used to enforce the SFP. The TSF shall allow the [none] to specify alternative initial values to override the default values when an object or information is created. FMT_MSA.1 Management of security attributes FMT_SMR.1 Security roles Notes: None FMT_MTD.1 Management of TSF data Hierarchical to: FMT_MTD.1.1 Dependencies: No other components The TSF shall restrict the ability to [modify] the [User Password] to [individual users (that is related to the password)]. FMT_SMR.1 Security roles FMT_SMF.1 Specification of Management Functions Notes: None 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 management functions: [ a) creation of administrative users with default passwords b) changing of passwords c) management of Access Control lists ] 16 of 27
17 Dependencies: Notes: No dependencies. None FMT_SMR.1 Security Roles Hierarchical to: FMT_SMR.1.1 FMT_SMR.1.2 Dependencies: Notes: No other components. a) The TSF shall maintain the roles [Telecommunication Employees, Telecommunication administrator, super administrator and mobile subscriber]. The TSF shall be able to associate users with roles. FIA_UID.1 Timing of identification None FTP_ITC.1 Inter TSF trusted channel Hierarchical to: FTP_ITC.1.1 FTP_ITC.1.2 FTP_ITC.1.3 Dependencies: Notes: No other components. The TSF shall provide a communication channel between itself and another remote instance of the TOE 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. The TSF shall permit [the TSF] to initiate communication via the trusted channel. The TSF shall initiate communication via the trusted channel for [Transfer of user data]. None None. 17 of 27
18 4.4 Dependency analysis SFR Dependency Inclusion 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 None as there are no key used for MD5 therefore there is no need for key generation as well as key destruction. FDP_ACC.1 FDP_ACF.1 Security attribute based access control FDP_ACF.1 FDP_ACF.1 FDP_ACC.1 Subset access control FMT_MSA.3 Static attribute initialisation FDP_ACC.1 FMT_MSA.3 FIA_UAU.2 FIA_UID.1 Timing of identification FIA_UID.2 FIA_UID.2 No dependencies N/A FMT_MSA.1 [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 FDP_ACC.1 FDP_ACF.1 FMT_SMF.1 FMT_SMR.1 FMT_MSA.3 FMT_MSA.1 Management of security attributes FMT_SMR.1 Security roles FMT_MSA.1 FMT_SMR.1 18 of 27
19 SFR Dependency Inclusion FMT_MTD.1 FMT_SMR.1 Security roles FMT_SMF.1 Specification of Management Functions FMT_SMF.1 FMT_SMR.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 19 of 27
20 4.5 TOE security assurance requirements The assurance package for the evaluation of the TOE is Evaluation Assurance Level 1 (EAL1). EAL1 provides a basic level of assurance by a limited security target and an analysis of the SFRs in that ST using a functional and interface specification and guidance documentation, to understand the security behavior. The analysis is supported by a search for potential vulnerabilities in the public domain and independent testing (functional and penetration) of the TSF. EAL1 also provides assurance through unique identification of the TOE and of the relevant evaluation documents. This EAL provides a meaningful increase in assurance over unevaluated IT. Assurance class ADV: Development AGD: Guidance documents Assurance components ADV_FSP.1 Basic functional specification AGD_OPE.1 Operational user guidance AGD_PRE.1 Preparative procedures ALC: Life cycle support ALC_CMS.1 TOE CM coverage ALC_CMC.1 Labelling of the TOE ASE: Security Target evaluation ASE_CCL.1 Conformance claims ASE_ECD.1 Extended components definition ASE_INT.1 ST Introduction ASE_OBJ.1 Security objectives for the operational environment ASE_REQ.1 Stated security requirements ASE_TSS.1 TOE summary specification ATE: Tests AVA: Vulnerability assessment ATE_IND.1 Independent testing conformance AVA_VAN.1 Vulnerability survey 20 of 27
21 4.6 Assurance measures Assurance requirement ADV_FSP.1 Basic functional specification Assurance measures Development Demonstration The development assurance measure provides all the necessary design documentation to support the analysis of the TOE for an evaluation at EAL1. The functional specification provides a detailed description of the security functions of the TOE. AGD_OPE.1 Operational user guidance AGD_PRE.1 Preparative procedures Guidance documents The operational user guidance documentation provides the guidance for end users, administrators and other parties who will utilise the TOE. These documents provide all the necessary instructions and direction for ensuring that the TOE is installed, configured, used and administered in a secure manner. ALC_CMC.1 Labelling of the TOE Life cycle support Configuration management measures provide the assurance that the TOE and supporting ALC_CMS.1 TOE CM coverage evidence can be uniquely identified. ASE_CCL.1 Conformance claims ASE_ECD.1 Extended components definition Security Target evaluation Security Target evaluation assurance measures ensure that the claim to EAL1 can be accurately appraised. ASE_INT.1 ST Introduction ASE_OBJ.1 Security objectives for the operational environment 21 of 27
22 Assurance requirement ASE_REQ.1 Stated security requirements Assurance measures Demonstration ASE_TSS.1 TOE summary specification ATE_IND.1 Independent testing conformance AVA_VAN.1 Vulnerability survey Tests Vulnerability assessment The tests assurance measure ensures that the TOE has been appropriately tested for the claimed set of security functions. The test plans 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. The TOE will be made available for vulnerability analysis and penetration testing. 22 of 27
23 5 TOE summary specification (ASE_TSS) 5.1 Overview This section provides the TOE summary specification, a high level definition of the security functions claimed to meet the functional and assurance requirements. The TOE security functions include the following: User Data Protection Identification and Authentication Security Management Secure Communication User Data Protection The TOE enforces an access control policy on billing information. After a mobile subscriber identifies and authenticates to the mobile billing server via the mobile billing applet, the mobile billing server will check all access to the billing information from the user. The TOE will permit a user to access a protected resource only if a userid or role/level of the user has permission to perform the requested action on the resource (FDP_ACC.1, FDP_ACF.1). For the Telecommunication Administrator, Telecommunication Employee and the Super Administrator, they authenticate themselves through the Mobile Billing Webtool (web portal). The TOE maintains access control lists for each object within an organisation. Each ACL maps users and roles to the operations that they are permitted to perform on the object. For the mobile subscriber, their userid, IMEI (International Mobile Equipment Identity is a unique 17 or 15 digit code used to identify an individual mobile station to a GSM or UMTS network), IMSI (International Mobile Subscriber Identity is a unique 15 digit code used to identify an individual user on a GSM network and a TAC code which is issued to the user during registration will be used to identify the user when they are accessing the billing information. This is to ensure that only the user with the registered sim card and phone can access the information. There are 4 users maintained by the TOE. They are the Mobile Subscriber, Telecommunication Administrator, Telecommunication Employee and the Super Administrator (FMT_SMR.1). Each type of user will have different access rights to billing information. For mobile subscriber, they can only access 23 of 27
24 their own billing information whereas telecommunication administrator can access all information. All users will have a unique user ID Identification and Authentication When a user issues a request to the TOE to access a his/her billing information, the TOE requires that the user (being a Mobile Subscriber, Telecommunication Administrator, Telecommunication Employee or Super Administrator) identify and authenticate themselves before performing any TSF mediated action (FIA_UID.2, FIA_UAU.2). The TOE checks the credentials presented by the user upon the login page against the authentication information in the database. Mobile Subscriber will login through the interface orovided by the Mobile Billing applet on their mobile device. For the Telecommunication Administrator, Telecommunication Employee and the Super Administrator, they will login through the Mobile Billing Webtool (web portal). All users presented passwords are hashed before being used to authenticate the user or when users change their passwords (FMT_MTD.1/Password) and is being written to the database. This is all done by the Mobile Billing Server (FCS_COP.1) Security Management The TOE contains various management functions to ensure efficient and secure management of the TOE (FMT_SMF.1): Mobile Subscriber 1. Checking their own account statement Telecommunication Administrator 1. Authenticate to the Mobile Billing Server and as well as performing management functions according to their roles through the Mobile Billing Webtool 2. Only telecommunication administrator and super administrators can change passwords, reset passwords and change the access levels of the telecommunication employees 3. Reset Password for user that forgot its password. Super Administrator 1. Authenticate to the Mobile Billing Server and as well as performing management functions according to their roles through the Mobile Billing Webtool 24 of 27
25 2. Only telecommunication administrator and super administrators can change passwords, reset passwords and change the access levels of the telecommunication employees 3. Create administrator users for the telecommunication company Telecommunication Employees 1. Authenticate to the Mobile Billing Server and as well as performing management functions according to their level that is allocated to them by the telecommunication administrators or super administrator through the Mobile Billing Webtool The TOE allows no one to change the default values of the TSF data and security attributes of the TOE as well as the ACL (FMT_MSA.3, FMT_MSA.1) Secure Communication The TOE uses SSL to protect billing information flowing among the TOE components (Mobile Billing server and the applet installed on mobile devices) from disclosure (FTP_ITC.1). The initiation of the secure SSL channel is done by the Mobile Billing Applet on the Mobile Subscriber s mobile device. Whenever user launches the applet and proceed to authenticate themselves, the Mobile Billing Applet will do a handshake protocol with the Mobile Billing Server and after this, a session key will be generated and will be used to encrypt the user data sent/retrieved to and from the Mobile Billing Server. 25 of 27
26 6 Glossary Term Authentication Data FIPS MD5 Mobile Subscriber SSL Super Administrator Telecommunication Administrator TSC TSF data User data Description It is information used to verify the claimed identity of a user. It is a Federal Information Processing Standards Publications (FIPS PUBS) are issued by the National Institute of Standards and Technology for Secure Hash Standard MD5 (Message Digest algorithm 5) is a cryptographic hash function with a 128 bit hash value. Mobile Subscriber access the TOE through the Mobile Billing applet on their mobile phones. The TLS is a protocol that allows client/server applications to communicate across a network in a way designed to prevent eavesdropping and tampering. Super Administrators are from IDOTTV. They are responsible for the correct operation of the Mobile Billing Server (installation, configuration and maintenance). Administrators are from the telecommunication operator who subscribe to the mobile billing service for their mobile users. They are responsible for the subscription of mobile users and their data and they administer these though the web portal provided by IDOTTV. TSC (TSF Scope of Control) The set of interactions that can occur with or within a TOE and are subject to the rules of the TSP. Data created by and for the TOE, that might affect the operation of the TOE Data created by and for the user that does not affect the operation of the TSF. 26 of 27
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