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Cisco Security Advisory: Cisco Catalyst 6000, 6500 Series and Cisco 7600 Series NAM (Network Analysis Module) Vulnerability

Advisory ID: cisco-sa-20070228-nam

Revision 1.0

For Public Release 2007 February 28

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Summary =======

Cisco Catalyst 6000, 6500 series and Cisco 7600 series that have a Network Analysis Module installed are vulnerable to an attack, which could allow an attacker to gain complete control of the system. Only Cisco Catalyst systems that have a NAM on them are affected. This vulnerability affects systems that run Internetwork Operating System (IOS) or Catalyst Operating System (CatOS).

Cisco has made free software available to address this vulnerability for affected customers.

This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20070228-nam.shtml

Affected Products =================

Vulnerable Products +------------------

Catalyst 6000, 6500 series and Cisco 7600 series that have a NAM installed in them are affected. A system that has a NAM can be identified by the show module command. A NAM will be seen as WS-SVC-NAM-1, WS-SVC-NAM-2 or WS-X6380-NAM in this output.

This vulnerability affects systems that run IOS or CatOS.

A sample output for a system that has a NAM-2 on it is provided below:

Cat6k#show module Mod Ports Card Type Model Serial No. - --- ----- -------------------------------------- ------------------ ----------- 1 2 Catalyst 6000 supervisor 2 (Active) WS-X6K-SUP2-2GE SAL06417E23 3 48 48 port 10/100 mb RJ-45 ethernet WS-X6248-RJ-45 SAD050108R4 5 8 8 port 1000mb ethernet WS-X6408-GBIC SAD041300CL 6 8 Network Analysis Module WS-SVC-NAM-2 SAD093002AM

Products Confirmed Not Vulnerable +--------------------------------

* Catalyst 6000, 6500 and Cisco 7600 series that do not have a NAM are not affected. * Network Analysis Modules for Cisco Branch Routers (NM-NAM) are not affected.

No other Cisco products are known to be affected by this vulnerability.

Details =======

NAMs are deployed in Catalyst 6000, 6500 series and Cisco 7600 series to monitor and analyze network traffic by using Remote Monitoring (RMON), RMON2, and other MIBs. More information about NAMs can be found at the following URL:

http://www.cisco.com/en/US/products/hw/switches/ps708/products_module_config...

NAMs communicate with the Catalyst system by using the Simple Network Management Protocol (SNMP). By spoofing the SNMP communication between the Catalyst system and the NAM an attacker may obtain complete control of the Catalyst system.

Devices running both Cisco IOS and Cisco CatOS are affected by this vulnerability. This vulnerability is introduced in CatOS at 7.6(15) and 8.5(1). Older CatOS images are not vulnerable.

This issue is documented in bug IDs CSCsd75273 ( registered customers only) , CSCse52951 ( registered customers only) for IOS and CSCse39848 ( registered customers only) for CatOS.

Vulnerability Scoring Details +----------------------------

Cisco is providing scores for the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). Cisco will provide a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.

Cisco PSIRT will set the bias in all cases to normal. Customers are encouraged to apply the bias parameter when determining the environmental impact of a particular vulnerability.

CVSS is a standards-based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.

Cisco has provided an FAQ to answer additional questions regarding CVSS at http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html.

Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at http://intellishield.cisco.com/security/alertmanager/cvss

CSCsd75273 - Cat6k NAM vulnerability

CVSS Base Score: 10 - - Access Vector: Remote - - Access Complexity: Low - - Authentication: Not Required - - Confidentiality Impact: Complete - - Integrity Impact: Complete - - Availability Impact: Complete - - Impact Bias: Normal

CVSS Temporal Score: 8.3 - - Exploitability: Functional - - Remediation Level: Official Fix - - Report Confidence: Confirmed

CSCse52951 - Catk NAM vulnerability, additional protection

CVSS Base Score: 10 - - Access Vector: Remote - - Access Complexity: Low - - Authentication: Not Required - - Confidentiality Impact: Complete - - Integrity Impact: Complete - - Availability Impact: Complete - - Impact Bias: Normal

CVSS Temporal Score: 8.3 - - Exploitability: Functional - - Remediation Level: Official Fix - - Report Confidence: Confirmed

CSCse39848 - Cat6k NAM vulnerability in CatOS

CVSS Base Score: 10 - - Access Vector: Remote - - Access Complexity: Low - - Authentication: Not Required - - Confidentiality Impact: Complete - - Integrity Impact: Complete - - Availability Impact: Complete - - Impact Bias: Normal

CVSS Temporal Score: 8.3 - - Exploitability: Functional - - Remediation Level: Official Fix - - Report Confidence: Confirmed

Impact ======

By successfully exploiting this vulnerability, an attacker may gain complete control of the device.

Software Version and Fixes ==========================

When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution.

In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Technical Assistance Center ("TAC") or your contracted maintenance provider for assistance.

Each row of the Cisco IOS software table (below) describes a release train and the platforms or products for which it is intended. If a given release train is vulnerable, then the earliest possible releases that contain the fix (the "First Fixed Release") and the anticipated date of availability for each are listed in the "Rebuild" and "Maintenance" columns. A device running a release in the given train that is earlier than the release in a specific column (less than the First Fixed Release) is known to be vulnerable. The release should be upgraded at least to the indicated release or a later version (greater than or equal to the First Fixed Release label).

For more information on the terms "Rebuild" and "Maintenance," consult the following URL: http://www.cisco.com/warp/public/620/1.html.

+-----------------------------------------------------------------------------+ | Major Release | Availability of Repaired Releases | |------------------------------+----------------------------------------------| | Affected 12.1-Based Release | Rebuild | Maintenance | |------------------------------+---------------------+------------------------| | | 12.1(26)E8 | | |12.1E |---------------------+------------------------| | | 12.1(27b)E1 | | |------------------------------+---------------------+------------------------| | 12.1EX | 12.1(12c)EX | 12.1(13)EX | |------------------------------+---------------------+------------------------| | Affected 12.2-Based Release | Rebuild | Maintenance | |------------------------------+----------------------------------------------| | 12.2EU | Vulnerable; migrate to 12.2(25)EWA7 or later | |------------------------------+----------------------------------------------| | 12.2EW | Vulnerable; migrate to 12.2(25)EWA7 or later | |------------------------------+----------------------------------------------| | 12.2EWA | | 12.2(25)EWA7 | |------------------------------+----------------------------------------------| | 12.2IXA | Vulnerable; migrate to 12.2(18)IXB2 or later | |------------------------------+----------------------------------------------| | 12.2IXB | 12.2(18)IXB2 | | |------------------------------+---------------------+------------------------| | | 12.2(14)S3 | | |12.2S |---------------------+------------------------| | | 12.2(18)S5 | 12.2(20)S | |------------------------------+---------------------+------------------------| | 12.2SG | 12.2(25)SG1 | | |------------------------------+---------------------+------------------------| | 12.2SGA | 12.2(31)SGA1 | | |------------------------------+---------------------+------------------------| | 12.2SRA | 12.2(33)SRA2 | | |------------------------------+----------------------------------------------| | 12.2SX | Vulnerable; migrate to 12.2(18)SXD7a or | | | later | |------------------------------+----------------------------------------------| | 12.2SXA | Vulnerable; migrate to 12.2(18)SXD7a or | | | later | |------------------------------+----------------------------------------------| | 12.2SXB | Vulnerable; migrate to 12.2(18)SXD7a or | | | later | |------------------------------+----------------------------------------------| | 12.2SXD | 12.2(18)SXD7a | | |------------------------------+---------------------+------------------------| | 12.2SXE | 12.2(18)SXE6a | | |------------------------------+---------------------+------------------------| | 12.2SXF | 12.2(18)SXF5 | | |------------------------------+----------------------------------------------| | 12.2SY | Vulnerable; migrate to 12.2(18)SXD7a or | | | later | |------------------------------+----------------------------------------------| | 12.2ZA | Vulnerable; migrate to 12.2(18)SXD7a or | | | later | |------------------------------+----------------------------------------------| | 12.2ZU | 12.2(18)ZU1 | | +-----------------------------------------------------------------------------+

+---------------------------------------+ | | Availability of Fixed | | CatOS | Releases | | Release |-------------------------| | | Interim | Maintenance | |-------------+-------------------------| | 5.x | Not vulnerable | |-------------+-------------------------| | 6.x | Not vulnerable | |-------------+-------------------------| | 7.6(1) | | | through 7.6 | Not vulnerable | | (14) | | |-------------+-------------------------| | 7.6(15) | | 7.6(20) | | through |7.6(19.2)| Available | | 7.6(19) | | 2007-Mar-09 | |-------------+---------+---------------| | 8.5(1) | | | | through | 8.5(5.3)| 8.5(6) | | 8.5(5) | | | |-------------+-------------------------| | 8.6(x) | Not vulnerable | +---------------------------------------+

Workarounds ===========

No workarounds exist for this vulnerability.

This vulnerability requires an attacker to spoof SNMP packets from the IP address of the NAM. Filtering SNMP traffic to an affected device can be used as a mitigation. Filtering SNMP traffic needs to be done on systems that are deployed in front of an affected device, since it is ineffective to filter against such spoofed packets on the device itself.

Anti-spoofing measures and infrastructure access-lists can also be deployed at your network edge as a potential mitigation technique. Refer to http://www.cisco.com/warp/public/707/iacl.html for examples on how to apply ACLs on Cisco routers for infrastructure protection.

Additional mitigations that can be deployed on Cisco devices within the network are available in the Cisco Applied Intelligence companion document for this advisory: http://www.cisco.com/warp/public/707/cisco-air-20070228-nam.shtml

Obtaining Fixed Software ========================

Cisco will make free software available to address this vulnerability for affected customers. This advisory will be updated as fixed software becomes available. Prior to deploying software, customers should consult their maintenance provider or check the software for feature set compatibility and known issues specific to their environment.

Customers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades, customers agree to be bound by the terms of Cisco's software license terms found at http://www.cisco.com/public/sw-license-agreement.html, or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml.

Do not contact either "psirt@cisco.com" or "security-alert@cisco.com" for software upgrades.

Customers with Service Contracts +-------------------------------

Customers with contracts should obtain upgraded software through their regular update channels. For most customers, this means that upgrades should be obtained through the Software Center on Cisco's worldwide website at http://www.cisco.com.

Customers using Third Party Support Organizations +------------------------------------------------

Customers whose Cisco products are provided or maintained through prior or existing agreement with third-party support organizations such as Cisco Partners, authorized resellers, or service providers should contact that support organization for guidance and assistance with the appropriate course of action in regards to this advisory.

The effectiveness of any workaround or fix is dependent on specific customer situations such as product mix, network topology, traffic behavior, and organizational mission. Due to the variety of affected products and releases, customers should consult with their service provider or support organization to ensure any applied workaround or fix is the most appropriate for use in the intended network before it is deployed.

Customers without Service Contracts +----------------------------------

Customers who purchase direct from Cisco but who do not hold a Cisco service contract and customers who purchase through third-party vendors but are unsuccessful at obtaining fixed software through their point of sale should get their upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC contacts are as follows.

* +1 800 553 2447 (toll free from within North America) * +1 408 526 7209 (toll call from anywhere in the world) * e-mail: tac@cisco.com

Have your product serial number available and give the URL of this notice as evidence of your entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC.

Refer to http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml for additional TAC contact information, including special localized telephone numbers and instructions and e-mail addresses for use in various languages.

Exploitation and Public Announcements =====================================

The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.

This vulnerability was found internally.

Status of this Notice:FINAL ===========================

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.

Distribution ============

This advisory is posted on Cisco's worldwide website at:

http://www.cisco.com/warp/public/707/cisco-sa-20070228-nam.shtml

In addition to worldwide web posting, a text version of this notice is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients.

* cust-security-announce@cisco.com * first-teams@first.org * bugtraq@securityfocus.com * vulnwatch@vulnwatch.org * cisco@spot.colorado.edu * cisco-nsp@puck.nether.net * full-disclosure@lists.grok.org.uk * comp.dcom.sys.cisco@newsgate.cisco.com

Future updates of this advisory, if any, will be placed on Cisco's worldwide website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the above URL for any updates.

Revision History ================

+----------------------------------------+ | Revision | | Initial | | 1.0 | 2007-February-28 | public | | | | release. | +----------------------------------------+

Cisco Security Procedures =========================

Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at http://www.cisco.com/en/US/products/ products_security_vulnerability_policy.html. This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at http://www.cisco.com/go/psirt.