Table Of Contents
Cisco 1721 and Cisco 1760 Modular Access Routers with MOD1700-VPN FIPS 140-2 Non-Proprietary Security Policy
Level 2 Validation
May 7, 2004
This is the non-proprietary Cryptographic Module Security Policy for the 1721 and 1760 Modular Access Routers with MOD1700-VPN. This security policy describes how the 1721 and 1760 routers (Hardware Version: 1721, 1760; MOD1700-VPN: Hardware Version 2.1, Board Version A0; Firmware Version: IOS 12.3(3d)) meet the security requirements of FIPS 140-2, and how to operate the 1721 and 1760 routers in a secure FIPS 140-2 mode. This policy was prepared as part of the Level 2 FIPS 140-2 validation of the 1721 and 1760 routers.
FIPS 140-2 (Federal Information Processing Standards Publication 140-2—Security Requirements for Cryptographic Modules) details the U.S. Government requirements for cryptographic modules. More information about the FIPS 140-2 standard and validation program is available on the NIST website at http://csrc.nist.gov/cryptval/.
This document contains the following sections:
This document deals only with operations and capabilities of the Cisco 1721 and Cisco 1760 routers in the technical terms of a FIPS 140-2 cryptographic module security policy. More information is available on the Cisco 1721 and Cisco 1760 routers and the entire Cisco 1700 Series from the following sources:
•The Cisco Systems website contains information on the full line of products at www.cisco.com. The Cisco 1700 Series product descriptions can be found at:
•For answers to technical or sales related questions please refer to the contacts listed on the Cisco Systems website at www.cisco.com.
•The NIST Validated Modules website (http://csrc.nist.gov/cryptval) contains contact information for answers to technical or sales-related questions for the module
In this document, the Cisco 1721 and Cisco 1760 routers are referred to as the routers, the modules, or the systems.
The Security Policy document is part of the FIPS 140-2 Submission Package. In addition to this document, the Submission Package contains:
•Vendor Evidence document
•Finite State Machine
•Module Software Listing
•Other supporting documentation as additional references
This document provides an overview of the Cisco 1721 and 1760 routers and explains the secure configuration and operation of the modules. This introduction section is followed by the section "The 1721/1760 Router", which details the general features and functionality of the 1721 and 1760 routers. "Secure Operation of the Cisco 1721/1760 Router" specifically addresses the required configuration for the FIPS-mode of operation.
With the exception of this Non-Proprietary Security Policy, the FIPS 140-2 Validation Submission Documentation is Cisco-proprietary and is releasable only under appropriate non-disclosure agreements. For access to these documents, please contact Cisco Systems.
The 1721/1760 Router
Branch office networking requirements are dramatically evolving, driven by web and e-commerce applications to enhance productivity and merging the voice and data infrastructure to reduce costs. The Cisco 1721 and 1760 routers offer versatility, integration, and security to branch offices. With numerous WAN Interface Cards (WICs) and Voice Interface Cards (VICs) available, the modular architecture of the Cisco router easily allows interfaces to be upgraded to accommodate network expansion. The Cisco 1721 and 1760 provide a scalable, secure, manageable remote access server that meets FIPS 140-2 Level 2 requirements. This section describes the general features and functionality provided by the Cisco 1721 and 1760 routers.
Figure 1 The Cisco 1721 and Cisco 1760 Routers
The 1721 and 1760 routers are multi-chip standalone cryptographic modules. The cryptographic boundary of the module consists of the physical perimeter of the module minus the three-dimensional space allocated for WICs and VICs. The cryptographic boundary includes the connection apparatus between the WIC (or VIC) and the motherboard/daughterboard that hosts the WIC (or VIC), but the boundary does not include the WIC (or VIC) itself. In other words, the cryptographic boundary encompasses all hardware components within the case of the device except any installed modular WICs (or VICs). All of the functionality discussed in this document is provided by components within this cryptographic boundary.
The Cisco 1721 and 1760 routers incorporate the MOD1700-VPN cryptographic accelerator card. The MOD1700-VPN is located inside the module chassis, and is installed directly on the motherboard.
The 1760 requires that a special opacity shield be installed over the right-hand side air vents in order to operate in FIPS-approved mode. The shield decreases the effective size of the vent holes, reducing visibility within the cryptographic boundary to FIPS-approved specifications. The shield is self-adhering to the side of the chassis. To install the shield, remove it from its paper backing and apply the shield to the chassis, aligning the holes on the shield with the vent-holes on the side of the chassis. Figure 2 demonstrates the proper application of the shield.
Figure 2 Cisco 1760 Opacity Shield Application
Cisco IOS features such as tunneling, data encryption, and termination of Remote Access WANs via IPSec, Layer 2 Forwarding (L2F) and Layer 2 Tunneling Protocols (L2TP) make the Cisco 1700 an ideal platform for building virtual private networks or outsourced dial solutions. Cisco 1700`s RISC-based processor provides the power needed for the dynamic requirements of the remote branch office.
The interfaces for the router are located on the rear panel of the Cisco 1721 and the front panel of the Cisco 1760 as shown in Figure 3.
Figure 3 Cisco 1721 and Cisco 1760 Physical Interfaces
The Cisco 1721 and 1760 routers feature console and auxiliary ports, single fixed LAN interfaces, two Cisco WAN interface card (WIC) slots on the 1721, and two WIC slots and two Voice interface card (VIC) slots on the 1760. WAN interface cards support a variety of serial, ISDN BRI, and integrated CSU/DSU options for primary and backup WAN connectivity. All Cisco 1700 series routers include an auxiliary port supporting 115Kbps Dial-On-Demand Routing, ideal for back-up WAN connectivity.
A WIC is inserted into one of the WIC slots, which are located on the back panel of the 1721 and the front panel of the 1760. WICs interface directly with the processor, and cannot perform cryptographic functions; they only serve as a data input and data output physical interface.
The physical interfaces include a power plug for the power supply and a power switch. The router has one Fast Ethernet (10/100 RJ-45) connector for data transfers in and out. The module also has two other RJ-45 connectors on the back panel for a console terminal for local system access and an auxiliary port for remote system access or dial backup using a modem. The 10/100Base-T LAN port has Link/Activity, 10/100Mbps, and half/full duplex LEDs. Figure 4 shows the LEDs located on the rear panel of the Cisco 1721 with descriptions detailed in Table 1:
Figure 4 Cisco 1721 Rear Panel LEDs
Figure 5 shows the front panel LEDs of the Cisco 1721 and 1760, which provide overall status of the router's operation. The front panel of the Cisco 1721 displays whether or not the router is booted, overall activity/link status, and collision information. The front panel of the Cisco 1760 displays whether or not the router is booted, overall activity/link status, collision information, and specific information for each installed interface.
Figure 5 Cisco 1721 and 1760 Front Panel LEDs
All of these physical interfaces are separated into the logical interfaces from FIPS 140-2 as described in the Table 4:
Roles and Services
Authentication is role-based. There are two main roles in the router that operators may assume: the Crypto Officer role and the User role. The administrator of the router assumes the Crypto Officer role in order to configure and maintain the router using Crypto Officer services, while the Users exercise only the basic User services. Both roles are authenticated by providing a valid username and password. The configuration of the encryption and decryption functionality is performed only by the Crypto Officer after authentication to the Crypto Officer role by providing a valid Crypto Officer username and password. Once the Crypto Officer has configured the encryption and decryption functionality, the User can use this functionality after authentication to the User role by providing a valid User username and password. The Crypto Officer can also use the encryption and decryption functionality after authentication to the Crypto Officer role. The module supports RADIUS and TACACS+ for authentication and they are used in the FIPS mode. A complete description of all the management and configuration capabilities of the Cisco Routers can be found in the Performing Basic System Management manuals and in the online help for the routers.
The User and Crypto Officer passwords and the RADIUS/TACACS+ shared secrets must each be at least 8 alphanumeric characters in length. See the "Secure Operation of the Cisco 1721/1760 Router" section for more information. If only integers 0-9 are used without repetition for an 8 digit PIN, the probability of randomly guessing the correct sequence is 1 in 1,814,400. Including the rest of the alphanumeric characters drastically decreases the odds of guessing the correct sequence.
Crypto Officer Services
During initial configuration of the router, the Crypto Officer password (the "enable" password) is defined. A Crypto Officer may assign permission to access the Crypto Officer role to additional accounts, thereby creating additional Crypto Officers.
The Crypto Officer role is responsible for the configuration and maintenance of the router. The Crypto Officer services consist of the following:
•Configure the router—define network interfaces and settings, create command aliases, set the protocols the router will support, enable interfaces and network services, set system date and time, and load authentication information.
•Define Rules and Filters—create packet Filters that are applied to User data streams on each interface. Each Filter consists of a set of Rules, which define a set of packets to permit or deny based characteristics such as protocol ID, addresses, ports, TCP connection establishment, or packet direction.
•Status Functions—view the router configuration, routing tables, active sessions, use Gets to view SNMP MIB II statistics, health, temperature, memory status, voltage, packet statistics, review accounting logs, and view physical interface status.
•Manage the router—log off users, shutdown or reload the outer, manually back up router configurations, view complete configurations, manager user rights, and restore router configurations.
•Set Encryption/Bypass—set up the configuration tables for IP tunneling. Set keys and algorithms to be used for each IP range or allow plaintext packets to be set from specified IP address.
•Change WAN Interface Cards/Network Modules—insert and remove WICs or NMs as described in the second bullet in the "Initial Setup" section of this document.
A User enters the system by accessing the console port with a terminal program. The IOS prompts the User for their password. If the password is correct, the User is allowed entry to the IOS executive program. The services available to the User role consist of the following:
•Status Functions—view state of interfaces, state of layer 2 protocols, version of IOS currently running
•Network Functions—connect to other network devices through outgoing telnet, PPP, etc. and initiate diagnostic network services (i.e., ping, mtrace)
•Terminal Functions—adjust the terminal session (e.g., lock the terminal, adjust flow control)
•Directory Services—display directory of files kept in flash memory
The router is entirely encased by a thick steel chassis. Two WIC slots are provided on the rear of the 1721, and four WIC/VIC slots are provided on the front of the 1760. On-board LAN connectors and Console/Auxiliary connectors are provided on the rear of the 1721 and the front of the 1760, and the power cable connection and a power switch are provided on the rear of both models. The top portion of the chassis may be removed to allow access to the motherboard, memory, and expansion slots.
Any WIC or VIC slot, which is not populated with a WIC or a VIC, must be populated with an appropriate slot cover in order to operate in a FIPS compliant mode. The slot covers are included with each router, and additional covers may be ordered from Cisco. The same procedure mentioned below to apply tamper evidence labels for WICs and VICs must also be followed to apply tamper evidence labels for the slot covers.
Once the router has been configured in to meet FIPS 140-2 Level 2 requirements, the router cannot be accessed without signs of tampering. To seal the system, apply serialized tamper-evidence labels as follows.
To apply serialized tamper-evidence labels to the Cisco 1721:
Step 1 Clean the cover of any grease, dirt, or oil before applying the tamper evidence labels. Alcohol-based cleaning pads are recommended for this purpose. The temperature of the router should be above 10°C.
Step 2 Place the first label on the router as shown in Figure 6. The tamper evidence label should be placed so that the one half of the tamper evidence label covers the top-half of the right side of the enclosure and the other half covers the bottom-half of the right side of the router. Any attempt to remove the enclosure will leave tamper evidence.
Step 3 Place the second label on the router as shown in Figure 6. The tamper evidence label should be placed so that the one half of the tamper evidence label covers the top-half of the left side of the enclosure and the other half covers the bottom-half of the left side of the router. Any attempt to remove the enclosure will leave tamper evidence.
Step 4 Place the third label on the router as shown in Figure 6. The tamper evidence label should be placed so that the half of the label covers the enclosure and the other half covers the left WAN interface card slot. Any attempt to remove a WAN interface card will leave tamper evidence.
Step 5 Place the fourth label on the router as shown in Figure 6. The tamper evidence label should be placed so that one half of the label covers the enclosure and the other half covers the right WAN interface card slot. Any attempt to remove a WAN interface card will leave tamper evidence.
Step 6 The labels completely cure within five minutes.
To apply serialized tamper-evidence labels to the Cisco 1760:
Step 1 Clean the cover of any grease, dirt, or oil before applying the tamper evidence labels. Alcohol-based cleaning pads are recommended for this purpose. The temperature of the router should be above 10°C.
Step 2 Place the first label on the router as shown in Figure 6. The tamper evidence label should be placed so that the one half of the tamper evidence label covers the right side of the enclosure and the other half covers the right side of the front of the router. Any attempt to remove the enclosure will leave tamper evidence.
Step 3 Place the second label on the router as shown in Figure 6. The tamper evidence label should be placed so that the one half of the tamper evidence label covers the left side of the enclosure and the other half covers the left side of the front of the router. Any attempt to remove the enclosure will leave tamper evidence.
Step 4 Place the third label on the router as shown in Figure 6. The tamper evidence label should be placed so that the half of the label covers the bottom of the enclosure and the other half covers the first WAN interface card slot. Any attempt to remove a WAN interface card will leave tamper evidence.
Step 5 Place the fourth label on the router as shown in Figure 6. The tamper evidence label should be placed so that the half of the label covers the bottom of the enclosure and the other half covers the second WAN interface card slot. Any attempt to remove a WAN interface card will leave tamper evidence.
Step 6 Place the fifth label on the router as shown in Figure 6. The tamper evidence label should be placed so that the half of the label covers the bottom of the enclosure and the other half covers the third WAN interface card slot. Any attempt to remove a WAN interface card will leave tamper evidence.
Step 7 Place the sixth label on the router as shown in Figure 6. The tamper evidence label should be placed so that the half of the label covers the bottom of the enclosure and the other half covers the fourth WAN interface card slot. Any attempt to remove a WAN interface card will leave tamper evidence.
Step 8 The labels completely cure within five minutes.
Figure 6 Cisco 1721 and Cisco 1760 Tamper Evidence Label Placement
The tamper evidence seals are produced from a special thin gauge vinyl with self-adhesive backing. Any attempt to open the router, remove WIC cards, or remove the front faceplate will damage the tamper evidence seals or the painted surface and metal of the module cover. Since the tamper evidence seals have non-repeated serial numbers, they may be inspected for damage and compared against the applied serial numbers to verify that the module has not been tampered. Tamper evidence seals can also be inspected for signs of tampering, which include the following: curled corners, bubbling, crinkling, rips, tears, and slices. The word "OPEN" may appear if the label was peeled back.
Cryptographic Key Management
The router securely administers both cryptographic keys and other critical security parameters such as passwords. The tamper evidence seals provide physical protection for all keys. All keys are also protected by the password-protection on the Crypto Officer role login, and can be zeroized by the Crypto Officer. Keys are exchanged manually and entered electronically via manual key exchange or Internet Key Exchange (IKE).
The modules contain a cryptographic accelerator card (the MOD1700-VPN), which provides DES (56-bit) (only for legacy systems), and 3DES (168-bit) IPSec encryption, MD5 and SHA-1 hashing, and has hardware support for DH and RSA key generation.
The module supports the following critical security parameters (CSPs):
The services accessing the CSPs, the type of access and which role accesses the CSPs are listed in Table 6.
The module supports DES (only for legacy systems), 3DES, DES-MAC, TDES-MAC, AES, SHA-1, HMAC-SHA-1, MD5, MD4, HMAC MD5, Diffie-Hellman, RSA (for digital signatures and encryption/decryption (for IKE authentication)), cryptographic algorithms. The MD5, HMAC MD5, and MD4 algorithms are disabled when operating in FIPS mode.
The module supports three types of key management schemes:
•Manual key exchange method that is symmetric. DES/3DES/AES key and HMAC-SHA-1 key are exchanged manually and entered electronically.
•Internet Key Exchange method with support for exchanging pre-shared keys manually and entering electronically.
–The pre-shared keys are used with Diffie-Hellman key agreement technique to derive DES, 3DES or AES keys.
–The pre-shared key is also used to derive HMAC-SHA-1 key.
•Internet Key Exchange with RSA-signature authentication.
All pre-shared keys are associated with the CO role that created the keys, and the CO role is protected by a password. Therefore, the CO password is associated with all the pre-shared keys. The Crypto Officer needs to be authenticated to store keys. All Diffie-Hellman (DH) keys agreed upon for individual tunnels are directly associated with that specific tunnel only via the IKE protocol.
All the keys and CSPs of the module can be zeroized. Please refer to the Description column of Table 5 for information on methods to zeroize each key and CSP.
In order to prevent any secure data from being released, it is important to test the cryptographic components of a security module to insure all components are functioning correctly. The router includes an array of self-tests that are run during startup and periodically during operations. If any of the self-tests fail, the router transitions into an error state. Within the error state, all secure data transmission is halted and the router outputs status information indicating the failure.
Self-tests performed by the IOS image:
–Firmware integrity test
–RSA signature KAT (both signature and verification)
–Power-up bypass test
–Conditional bypass test
–Pairwise consistency test on RSA signature
–Continuous random number generator tests
Self-tests performed by the MOD1700-VPN (cryptographic accelerator):
–Firmware integrity test
–Continuous random number generator test
Secure Operation of the Cisco 1721/1760 Router
The Cisco 1721 and 1760 Modular Access Routers with MOD1700-VPN meet all the Level 2 requirements for FIPS 140-2. Follow the setting instructions provided below to place the module in FIPS mode. Operating this router without maintaining the following settings will remove the module from the FIPS approved mode of operation.
•The Crypto Officer must ensure that the MOD1700-VPN cryptographic accelerator card is installed in the module by opening the chassis and visually confirming the presence of the MOD1700-VPN. Please refer to the Cisco publication Installing the Virtual Private Network Module in a Cisco 1700 Series Router for detailed instructions on chassis disassembly and reassembly, and MOD1700-VPN identification. This document may be access on the web at:
•The Crypto Officer must apply tamper evidence labels as described in the "Physical Security" section of this document.
•Only a Crypto Officer may add and remove WAN Interface Cards. When removing the tamper evidence label, the Crypto Officer should remove the entire label from the router and clean the cover of any grease, dirt, or oil with an alcohol-based cleaning pad. The Crypto Officer must re-apply tamper evidence labels on the router as described in the "Physical Security" section of this document.
•The Crypto Officer must apply the opacity shield as described in the "The 1721/1760 Router" section of this document.
•The Crypto Officer must disable IOS Password Recovery by executing the following commands:configure terminalno service password-recoveryendshow version
Note Once Password Recovery is disabled, administrative access to the module without the password will not be possible.
System Initialization and Configuration
•The Crypto Officer must perform the initial configuration. IOS version 12.3(3d) is the only allowable image; no other image may be loaded.
•The value of the boot field must be 0x0102. This setting disables break from the console to the ROM monitor and automatically boots the IOS image. From the "configure terminal" command line, the Crypto Officer enters the following syntax:config-register 0x0102
•The Crypto Officer must create the "enable" password for the Crypto Officer role. The password must be at least 8 characters and is entered when the Crypto Officer first engages the "enable" command. The Crypto Officer enters the following syntax at the "#" prompt:enable secret [PASSWORD]
•The Crypto Officer must always assign passwords (of at least 8 characters) to users. Identification and authentication on the console port is required for Users. From the "configure terminal" command line, the Crypto Officer enters the following syntax:line con 0password [PASSWORD]login local
•The Crypto Officer shall only assign users to a privilege level 1 (the default).
•The Crypto Officer shall not assign a command to any privilege level other than its default.
•The Crypto Officer may configure the module to use RADIUS or TACACS+ for authentication. Configuring the module to use RADIUS or TACACS+ for authentication is optional. If the module is configured to use RADIUS or TACACS+, the Crypto-Officer must define RADIUS or TACACS+ shared secret keys that are at least 8 characters long.
•If the Crypto Officer loads any IOS image onto the router, this will put the router into a non-FIPS mode of operation.
IPSec Requirements and Cryptographic Algorithms
•There are two types of key management method that are allowed in FIPS mode: Internet Key Exchange (IKE) and IPSec manually entered keys.
•Although the IOS implementation of IKE allows a number of algorithms, only the following algorithms are allowed in a FIPS 140-2 configuration:
•The following algorithms are not FIPS approved and should be disabled:
–MD-4 and MD-5 for signing
All SNMP operations must be performed within a secure IPSec tunnel.
•Telnet access to the module is only allowed via a secure IPSec tunnel between the remote system and the module. The Crypto officer must configure the module so that any remote connections via telnet are secured through IPSec.
•SSH access to the module is only allowed if SSH is configured to use a FIPS-approved algorithm. The Crypto officer must configure the module so that SSH uses only FIPS-approved algorithms.
For more information about the Cisco 1721 and Cisco 1760 modular access routers, refer to the following documents:
•Cisco 1721 Access Router Hardware Installation Guide
•Cisco 1760 Modular Access Router Hardware Installation Guide
•Cisco 1700 Series Router Software Configuration Guide
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