[apops] Cisco Security Advisory: Cisco uBR10012 Series Devices SNMP Vuln

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  • Subject: [apops] Cisco Security Advisory: Cisco uBR10012 Series Devices SNMP Vulnerability
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 24 Sep 2008 17:50:00 +0200
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      Cisco Security Advisory: Cisco uBR10012 Series Devices SNMP
      Vulnerability
      
      Advisory ID: cisco-sa-20080924-ubr
      
      http://www.cisco.com/warp/public/707/cisco-sa-20080924-ubr.shtml
      
      Revision 1.0
      
      For Public Release 2008 September 24 1600 UTC (GMT)
      
      - ---------------------------------------------------------------------
      
      Summary
      =======
      
      Cisco uBR10012 series devices automatically enable Simple Network
      Management Protocol (SNMP) read/write access to the device if
      configured for linecard redundancy. This can be exploited by an
      attacker to gain complete control of the device. Only Cisco uBR10012
      series devices that are configured for linecard redundancy are
      affected.
      
      Cisco has released free software updates that address this
      vulnerability. Workarounds that mitigate this vulnerability are
      available.
      
      This advisory is posted at 
      http://www.cisco.com/warp/public/707/cisco-sa-20080924-ubr.shtml
      
      NOTE: The September 24, 2008 IOS Advisory bundled publication
      includes twelve Security Advisories. Eleven of the advisories address
      vulnerabilities in Cisco's IOS^  software, and one advisory addresses
      vulnerabilities in Cisco Unified Communications Manager. Each
      Advisory lists the releases that correct the vulnerability described
      in the Advisory. Please reference the following software table to
      find a release that fixes all published IOS software Advisories as of
      September 24th, 2008:
      
      http://www.cisco.com/warp/public/707/cisco-sa-20080924-bundle.shtml
      
      Individual publication links are listed below:
      
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosips.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-ssl.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-sip.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-cucm.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-vpn.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-mfi.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-ipc.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-ubr.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-multicast.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-sccp.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosfw.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-l2tp.shtml
      
      Affected Products
      =================
      
      Vulnerable Products
      +------------------
      
      Cisco uBR10012 series devices that are running Cisco IOS and
      configured for linecard redundancy are affected. Cisco uBR10012
      series devices can be identified by issuing the show version command.
      The following example shows output from a Cisco uBR10012 series
      device running Cisco IOS software release 12.3(17b)BC7:
      
          ubr10k#show version | include IOS
          IOS (tm) 10000 Software (UBR10K-K8P6U2-M), Version 12.3(17b)BC7, RELEASE SOFTWARE (fc1)
          ubr10k#
      
      Please refer to the document entitled "White Paper: Cisco IOS
      Reference Guide" for additional information on the Cisco IOS release
      naming conventions. This document is available at the following link:
      http://www.cisco.com/warp/public/620/1.html
      
      A Cisco uBR10012 series device configured for linecard redundancy
      will have a line similar to the following in the output of show
      running-config command:
      
          member subslot <slot>/<card> working
      
      or
      
          hccp <group> protect <worker-member-id> <worker-ip-address>
      
      Any version of Cisco IOS prior to the versions listed in the Software
      Versions and Fixes section below is vulnerable.
      
      Products Confirmed Not Vulnerable
      +--------------------------------
      
      Cisco uBR10012 series devices that are not configured for linecard
      redundancy are not affected.
      
      Cisco 10000 series devices are not affected even if they are
      configured for linecard redundancy.
      
      Other uBR platforms are not affected.
      
      No other Cisco products are currently known to be affected by this
      vulnerability.
      
      Details
      =======
      
      Cisco uBR10012 series devices need to communicate with an RF Switch
      when configured for linecard redundancy. This communication is based
      on SNMP (Simple Network Management Protocol). When linecard
      redundancy is enabled on a Cisco uBR10012 series device, SNMP is also
      automatically enabled with a default community string of private that
      has read/write privileges. Since there are no access restrictions on
      this community string, it may be exploited by an attacker to gain
      complete control of the device.
      
      Changing the default community string, adding access restrictions on
      SNMP or doing both will mitigate this vulnerability. The recommended
      mitigation is to do both.
      
      This vulnerability is documented in the Cisco Bug ID CSCek57932 
      and has been assigned Common Vulnerabilities and Exposures (CVE) ID
      CVE-2008-3807.
      
      Vulnerability Scoring Details
      =============================
      
      Cisco has provided scores for the vulnerabilities in this advisory
      based on the Common Vulnerability Scoring System (CVSS). The CVSS
      scoring in this Security Advisory is done in accordance with CVSS
      version 2.0.
      
      CVSS is a standards-based scoring method that conveys vulnerability
      severity and helps determine urgency and priority of response.
      
      Cisco has provided a base and temporal score. Customers can then
      compute environmental scores to assist in determining the impact of
      the vulnerability in individual networks.
      
      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
      
      CSCek57932 - SNMP enabled after redundancy is configured
      
      CVSS Base Score - 10
      
              Access Vector          - Network
              Access Complexity      - Low
              Authentication         - None
              Confidentiality Impact - Complete
              Integrity Impact       - Complete
              Availability Impact    - Complete
      
      CVSS Temporal Score - 8.3
      
              Exploitability          - Functional
              Remediation Level       - Official-Fix
              Report Confidence       - Confirmed
      
      
      Impact
      ======
      
      Successful exploitation of the vulnerability may allow an attacker to
      gain complete control of the device.
      
      Software Versions 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) names a Cisco IOS
      release train. If a given release train is vulnerable, then the
      earliest possible releases that contain the fix (along with the
      anticipated date of availability for each, if applicable) are listed
      in the "First Fixed Release" column of the table. The "Recommended
      Release" column indicates the releases which have fixes for all the
      published vulnerabilities at the time of this Advisory. 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. Cisco recommends upgrading to a release equal to or
      later than the release in the "Recommended Releases" column of the
      table.
      
      +-------------------------------------------------------------------+
      |   Major Release    |      Availability of Repaired Releases       |
      |--------------------+----------------------------------------------|
      |      Affected      |                              |  Recommended  |
      |     12.0-Based     |     First Fixed Release      |    Release    |
      |      Releases      |                              |               |
      |-------------------------------------------------------------------|
      | There are no affected 12.0 based releases                         |
      |-------------------------------------------------------------------|
      |      Affected      |                              |  Recommended  |
      |     12.1-Based     |     First Fixed Release      |    Release    |
      |      Releases      |                              |               |
      |-------------------------------------------------------------------|
      | There are no affected 12.1 based releases                         |
      |-------------------------------------------------------------------|
      |      Affected      |                              |  Recommended  |
      |     12.2-Based     |     First Fixed Release      |    Release    |
      |      Releases      |                              |               |
      |--------------------+------------------------------+---------------|
      | 12.2               | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2B              | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      |                    |                              | 12.2(33)SCA1  |
      |                    |                              |               |
      |                    | Vulnerable; migrate to any   | 12.3(23)BC4   |
      | 12.2BC             | release in 12.3              |               |
      |                    |                              | 12.4(15)T7    |
      |                    |                              |               |
      |                    |                              | 12.4(18c)     |
      |--------------------+------------------------------+---------------|
      | 12.2BW             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2BX             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2BY             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2BZ             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      |                    |                              | 12.2(33)SCA1  |
      |                    |                              |               |
      |                    | Vulnerable; migrate to any   | 12.3(23)BC4   |
      | 12.2CX             | release in 12.3              |               |
      |                    |                              | 12.4(15)T7    |
      |                    |                              |               |
      |                    |                              | 12.4(18c)     |
      |--------------------+------------------------------+---------------|
      |                    |                              | 12.2(33)SCA1  |
      |                    |                              |               |
      |                    | Vulnerable; migrate to any   | 12.3(23)BC4   |
      | 12.2CY             | release in 12.3              |               |
      |                    |                              | 12.4(15)T7    |
      |                    |                              |               |
      |                    |                              | 12.4(18c)     |
      |--------------------+------------------------------+---------------|
      | 12.2CZ             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2DA             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2DD             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2DX             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2EW             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2EWA            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2EX             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2EY             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2EZ             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2FX             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2FY             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2FZ             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2IRB            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2IXA            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2IXB            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2IXC            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2IXD            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2IXE            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2IXF            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2IXG            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2JA             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2JK             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2MB             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2MC             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2S              | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SB             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SBC            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SCA            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SE             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SEA            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SEB            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SEC            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SED            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SEE            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SEF            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SEG            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SG             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SGA            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SL             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SM             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SO             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SRA            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SRB            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SRC            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SU             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SV             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SVA            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SVC            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SVD            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SW             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SX             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SXA            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SXB            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SXD            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SXE            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SXF            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SXH            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SY             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2SZ             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2T              | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2TPC            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XA             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XB             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XC             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XD             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XE             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      |                    |                              | 12.2(33)SCA1  |
      |                    |                              |               |
      |                    | Vulnerable; migrate to any   | 12.3(23)BC4   |
      | 12.2XF             | release in 12.3              |               |
      |                    |                              | 12.4(15)T7    |
      |                    |                              |               |
      |                    |                              | 12.4(18c)     |
      |--------------------+------------------------------+---------------|
      | 12.2XG             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XH             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XI             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XJ             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XK             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XL             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XM             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XN             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XNA            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XNB            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XO             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XQ             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XR             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XS             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XT             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XU             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XV             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2XW             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YA             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YB             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YC             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YD             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YE             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YF             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YG             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YH             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YJ             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YK             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YL             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YM             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YN             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YO             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YP             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YQ             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YR             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YS             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YT             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YU             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YV             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YW             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YX             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YY             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2YZ             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2ZA             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2ZB             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2ZC             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2ZD             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2ZE             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2ZF             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2ZG             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2ZH             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2ZJ             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2ZL             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2ZP             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2ZU             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2ZX             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2ZY             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.2ZYA            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      |      Affected      |                              |  Recommended  |
      |     12.3-Based     |     First Fixed Release      |    Release    |
      |      Releases      |                              |               |
      |--------------------+------------------------------+---------------|
      | 12.3               | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3B              | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      |                    | 12.3(17b)BC8                 |               |
      | 12.3BC             |                              | 12.3(23)BC4   |
      |                    | 12.3(21)BC                   |               |
      |--------------------+------------------------------+---------------|
      | 12.3BW             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3EU             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3JA             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3JEA            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3JEB            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3JEC            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3JK             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3JL             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3JX             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3T              | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3TPC            | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3VA             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3XA             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3XB             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3XC             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3XD             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3XE             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3XF             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3XG             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3XI             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3XJ             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3XK             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3XL             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3XQ             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3XR             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3XS             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3XU             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3XW             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3XX             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3XY             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3XZ             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3YA             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3YD             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3YF             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3YG             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3YH             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3YI             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3YJ             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3YK             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3YM             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3YQ             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3YS             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3YT             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3YU             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3YX             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3YZ             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      | 12.3ZA             | Not Vulnerable               |               |
      |--------------------+------------------------------+---------------|
      |      Affected      |                              |  Recommended  |
      |     12.4-Based     |     First Fixed Release      |    Release    |
      |      Releases      |                              |               |
      |-------------------------------------------------------------------|
      | There are no affected 12.4 based releases                         |
      +-------------------------------------------------------------------+
      
      Workarounds
      ===========
      
      Changing SNMP community string and restricting access
      +----------------------------------------------------
      
      By default, Cisco uBR10012 series devices that are configured for
      linecard redundancy use a community string of private. This community
      string can be changed in Cisco IOS versions 12.3(13)BC and later. It
      is recommended to change the community string and apply access
      control restrictions that only permit authorized devices SNMP access
      to the device.
      
      The following configuration example provides operators with
      information on changing the community string and adding SNMP access
      control restrictions using an access control list (ACL).
      
          access-list 90 permit host <RF-Switch-IP-1>
          access-list 90 permit host <RF-Switch-IP-2>
          access-list 90 permit host <up-converter-IP-if-exists>
          access-list 90 deny any
      
          redundancy
            linecard-group 1 cable
              rf-switch snmp-community <RF-Switch-SNMP-community>
      
          snmp-server community <RF-Switch-SNMP-community> rw 90
      
      When the SNMP community is changed on a Cisco uBR10012 device, is
      must also be changed on the RF Switch. It can be changed by the
      following command:
      
          set SNMP COMMUNITY <RF-Switch-SNMP-community>
      
      If there is an up-converter in the network, the SNMP community used
      by the up-converter must also be changed after changing the community
      string on the Cisco uBR10012 device. Information on changing the
      community string used by the up-converter can be found at the
      following link:
      
      http://www.cisco.com/en/US/tech/tk86/tk804/technologies_tech_note09186a00801f7622.shtml#communication
      
      If the Cisco IOS version does not support changing the community
      string, access control restrictions can be applied to the default
      community string. The following configuration example provides
      operators with information on applying access control restrictions to
      the default community string.
      
          access-list 90 permit host <RF-Switch-IP-1>
          access-list 90 permit host <RF-Switch-IP-2>
          access-list 90 permit host <up-converter-IP-if-exists>
          access-list 90 deny any
      
          snmp-server community private rw 90
      
      Using Infrastructure ACLs at Network Boundary
      +--------------------------------------------
      
      Although it is often difficult to block traffic transiting your
      network, it is possible to identify traffic which should never be
      allowed to target your infrastructure devices and block that traffic
      at the border of your network. iACLs are a network security best
      practice and should be considered as a long-term addition to good
      network security as well as a workaround for this specific
      vulnerability. The iACL example shown below should be included as
      part of the deployed infrastructure access-list which will protect
      all devices with IP addresses in the infrastructure IP address range:
      
      
          !-- Permit SNMP (UDP port 161) packets from trusted hosts
          !-- destined to infrastructure addresses.
      
          !
          access-list 150 permit udp TRUSTED_HOSTS MASK INFRASTRUCTURE_ADDRESSES MASK eq 161
          !
      
          !-- Deny SNMP (UDP port 161) packets from all other sources
          !-- destined to infrastructure addresses.
      
          !
          access-list 150 deny udp any INFRASTRUCTURE_ADDRESSES MASK eq 161
          !
      
          !-- Permit/deny all other Layer 3 and Layer 4 traffic in
          !-- accordance with existing security policies and
          !-- configurations.
      
          !
      
          !-- Permit all other traffic to transit the device.
      
          !
          access-list 150 permit ip any any
          !
      
          !-- Apply iACL to interfaces in the ingress direction.
      
          !
          interface GigabitEthernet0/0
            ip access-group 150 in
          !
      
      The white paper entitled "Protecting Your Core: Infrastructure
      Protection Access Control Lists" presents guidelines and recommended
      deployment techniques for infrastructure protection access lists.
      This white paper can be obtained here:
      
      http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a1a55.shtml
      
      Additional Mitigation Techniques
      +-------------------------------
      
      Additional mitigation techniques that can be deployed on Cisco
      devices within the network are available in the Cisco Applied
      Mitigation Bulletin companion document for this advisory, which is
      available at the following link:
      
      http://www.cisco.com/warp/public/707/cisco-amb-20080924-ipc-and-ubr.shtml
      
      Obtaining Fixed Software
      ========================
      
      Cisco has released free software updates that address these
      vulnerabilities. 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/en/US/products/prod_warranties_item09186a008088e31f.html
      or as otherwise set forth at Cisco.com Downloads at 
      http://www.cisco.com/public/sw-center/sw-usingswc.shtml 
      
      Do not contact 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 agreements 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 do not hold a Cisco
      service contract, and customers who purchase through third-party
      vendors but are unsuccessful in obtaining fixed software through
      their point of sale should acquire 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
      
      Customers should have their product serial number available and be
      prepared to give the URL of this notice as evidence of 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 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-20080924-ubr.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-bulletins at lists dot 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      | 2008-Sep-24 | 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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