[apops] Cisco Security Advisory: Cisco Catalyst 6000, 6500 Series and Ci

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  • Subject: [apops] Cisco Security Advisory: Cisco Catalyst 6000, 6500 Series and Cisco 7600 Series NAM (Network Analysis Module) Vulnerability
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 28 Feb 2007 17:00:00 +0100
  • Cc: psirt at cisco dot com
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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 
      
      - ---------------------------------------------------------------------
      
      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_configuration_guide_chapter09186a0080394e09.html
      
      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 at cisco dot com" or "security-alert at cisco dot 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 at cisco dot 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 at cisco dot com
        * first-teams at first dot org
        * bugtraq at securityfocus dot com
        * vulnwatch at vulnwatch dot org
        * cisco at spot dot colorado dot edu
        * cisco-nsp at puck dot nether dot net
        * full-disclosure at lists.grok dot org dot uk
        * comp.dcom.sys.cisco at newsgate dot cisco dot 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.
      
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