[apops] Cisco Security Advisory: Cisco XR 12000 Series Shared Port Adapt

  • To: apops at apops dot net
  • Subject: [apops] Cisco Security Advisory: Cisco XR 12000 Series Shared Port Adapters Interface Processor Vulnerability
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 25 May 2011 11:47:45 -0400
  • Cc: psirt at cisco dot com
  • Delivered-to: apops at mailman dot apnic dot net
  • List-archive: <http://mailman.apnic.net/mailing-lists/apops>
  • List-help: <mailto:apops-request@apops.net?subject=help>
  • List-id: Asia Pacific Operators Forum <apops.apops.net>
  • List-post: <mailto:apops@apops.net>
  • List-subscribe: <http://mailman.apnic.net/mailman/listinfo/apops>, <mailto:apops-request@apops.net?subject=subscribe>
  • List-unsubscribe: <http://mailman.apnic.net/mailman/listinfo/apops>, <mailto:apops-request@apops.net?subject=unsubscribe>
  • Prevent-nondelivery-report:
  • Sender: nobody@cisco.com
    • Hash: SHA256
      Cisco Security Advisory: Cisco XR 12000 Series Shared Port Adapters
      Interface Processor Vulnerability
      Advisory ID: cisco-sa-20110525-iosxrspa
      Revision 1.0
      For Public Release 2011 May 25 1600 UTC (GMT)
      Cisco IOS XR Software Releases 3.9.0, 3.9.1, 3.9.2, 4.0.0, 4.0.1,
      4.0.2, and 4.1.0 are affected by a vulnerability that an
      unauthenticated, remote user could use to trigger a reload of the
      Shared Port Adapters (SPA) Interface Processor by sending specific IP
      version 4 (IPv4) packets to an affected device.
      Cisco has released free Software Maintenance Units (SMU) that address
      this vulnerability.
      Workarounds that mitigate this vulnerability are not available.
      This advisory is posted at:
      Affected Products
      This vulnerability affects any device that is running Cisco IOS XR
      Software Releases 3.9.0, 3.9.1, 3.9.2, 4.0.0, 4.0.1, 4.0.2, or 4.1.0
      and has a SPA interface processor installed.
      Vulnerable Products
      This vulnerability affects all Engine 5 Line Cards on the Cisco XR
      12000 Series Routers. The engine 5 line cards are the SIP-600,
      SIP-601, SIP-501, and SIP-401.
      To determine the Cisco IOS XR Software release that is running on a
      Cisco product, administrators can log in to the device and issue the 
      show version command-line interface (CLI) command to display the
      system banner. The system banner confirms that the device is running
      Cisco IOS XR Software by displaying text that is similar to "Cisco
      IOS XR Software". The software version is displayed after the text
      "Cisco IOS XR Software".
      The following example identifies a Cisco XR 12000 Series Router that
      is running Cisco IOS XR Software Release 3.9.1:
          RP/0/0/CPU0:example#show version
          Wed Dec 15 10:16:47.117 singa
          Cisco IOS XR Software, Version 3.9.1[00]
          Copyright (c) 2010 by Cisco Systems, Inc.
          ROM: System Bootstrap, Version 12.0(20090302:133850) [rtauro-sw30346-33S 1.23dev(0.36)] DEVELOPMENT SOFTWARE
          Copyright (c) 1994-2009 by cisco Systems,  Inc.
          example uptime is 26 minutes
          System image file is "disk0:c12k-os-mbi-3.9.1/mbiprp-rp.vm"
          cisco 12404/PRP (7457) processor with 3145728K bytes of memory.
          7457 processor at 1266Mhz, Revision 1.2
          1 Cisco 12000 Series Performance Route Processor
          1 Cisco 12000 Series SPA Interface Processor-601/501/401
          1 Cisco 12000 4 Port Gigabit Ethernet Controller (4 GigabitEthernet)
          3 Management Ethernet
          5 PLIM_QOS
          8 FastEthernet
          4 GigabitEthernet/IEEE 802.3 interface(s)
          1019k bytes of non-volatile configuration memory.
          982304k bytes of disk0: (Sector size 512 bytes).
          62420k bytes of disk1: (Sector size 512 bytes).
          65536k bytes of Flash internal SIMM (Sector size 256k).
          !--- output truncated
      To determine if a SPA interface processor is installed in the device,
      administrators can log in to the device and issue the show platform
      command to display the system line cards. The output confirms that
      the device has a SPA interface processor installed by displaying text
      that is similar to "L3LC Eng 5".
      The following example identifies a Cisco XR 12000 Series Router that
      has an Engine 5 Line Card installed:
          RP/0/0/CPU0:example#show platform
          Mon May  9 18:40:26.100 PST
          Node            Type            PLIM            State           Config State
          0/0/CPU0        PRP(Active)     N/A             IOS XR RUN      PWR,NSHUT,MON
          0/1/CPU0        L3LC Eng 5+     Jacket Card     IOS XR RUN      PWR,NSHUT,MON
          0/1/0           SPA             SPA-8XFE-TX     READY           PWR,NSHUT
          0/2/CPU0        L3LC Eng 3      GE-4            IOS XR RUN      PWR,NSHUT,MON
      Alternatively, performing the CLI command show diag | include SPA
      Interface Processor will also show if any SPA interface processor are
      installed. The following example shows a device with a SIP-401
          RP/0/0/CPU0:example#show diag | include SPA Interface Processor
          Mon May  9 18:44:23.069 PST
          SLOT  1 (RP/LC 1): Cisco 12000 Series SPA Interface Processor- 401
      Products Confirmed Not Vulnerable
      No other releases of Cisco IOS XR Software are affected.
      The following products are not affected by this vulnerability:
        * Cisco 12000 Series SPA interface processors running Cisco IOS
        * Cisco XR 12000 Series Engine 3 Line Cards
        * Cisco ASR 9000 Series Aggregation Services Routers
        * Cisco Carrier Routing System Series Routers
      No other Cisco products are currently known to be affected by this
      Cisco IOS XR Software, which is part of the Cisco IOS Software
      family, uses a microkernel-based distributed operating system
      infrastructure. Cisco IOS XR Software runs on the Cisco CRS, Cisco
      12000 Series Routers, and Cisco ASR 9000 Series Aggregation Services
      Routers. This vulnerability only affects the SPA interface processors
      on the Cisco 12000 Series Routers that are running affected versions
      of Cisco IOS XR Software.
      More information on Cisco IOS XR Software is available at the
      following link: http://www.cisco.com/en/US/products/ps5845/index.html
      This vulnerability affects any device that is running affected
      releases of Cisco IOS XR Software and has an IPv4 address configured
      on any of the SPA interface processor interfaces.
      When the SPA interface processor receives specific IPv4 packets
      destined for either a network or a network broadcast address of a
      configured interface, it will reload and produce an error message
      that is similar to what is shown in the example that follows. Transit
      traffic through the device does not trigger this vulnerability.
          RP/0/4/CPU0:Example#LC/0/1/CPU0:Apr 26 17:16:31.745 : tx_xbma[85]:
          %L2-E5EGRESSQ-4-INTERRUPT : WIM error: reg 0x200000
      This vulnerability is documented in Cisco bug ID CSCto45095 ( 
      registered customers only) and has been assigned Common
      Vulnerabilities and Exposures (CVE) ID CVE-2011-1651.
      Vulnerability Scoring Details
      Cisco has provided scores for the vulnerability 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:
      Cisco has also provided a CVSS calculator to help compute the
      environmental impact for individual networks at:
      * Cisco XR 12000 Series SPA Interface Processor Vulnerability
      CVSS Base Score - 7.8
          Access Vector -            Network
          Access Complexity -        Low
          Authentication -           None
          Confidentiality Impact -   None
          Integrity Impact -         None
          Availability Impact -      Complete
      CVSS Temporal Score - 6.4
          Exploitability -           Functional
          Remediation Level -        Official-Fix
          Report Confidence -        Confirmed
      Successful exploitation of the vulnerability may result in a
      reloading of the SPA interface processor. Repeated exploitation could
      result in a sustained denial of service (DoS) condition.
      Software Versions and Fixes
      When considering software upgrades, also consult: 
      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.
      |  Major   |         Availability of Repaired Releases         |
      | Release  |                                                   |
      | Affected |         |                              | First    |
      | 3.2.X    | SMU ID  | SMU NAME                     | Fixed    |
      | through  |         |                              | Release  |
      |3.8.X     |---------------------------------------------------|
      | Based    | There are no affected 3.2.X through 3.8.X based   |
      | Releases | releases                                          |
      | Affected |         |                              | First    |
      | 3.9.X    | SMU ID  | SMU NAME                     | Fixed    |
      | Based    |         |                              | Release  |
      | Releases |         |                              |          |
      |          |         |                              | No first |
      |          |         |                              | fixed    |
      |          |         |                              | release; |
      | 3.9.0    | None    | No SMU available; Contact    | Migrate  |
      |          |         | your Support Organization    | to       |
      |          |         |                              | 4.0.3,   |
      |          |         |                              | 4.1.1 or |
      |          |         |                              | later.   |
      |          |         |                              | No first |
      |          |         |                              | fixed    |
      |          |         |                              | release; |
      | 3.9.1    | AA04896 | c12k-os-mbi-3.9.1.CSCto45095 | Migrate  |
      |          |         |                              | to       |
      |          |         |                              | 4.0.3,   |
      |          |         |                              | 4.1.1 or |
      |          |         |                              | later.   |
      |          |         |                              | No first |
      |          |         |                              | fixed    |
      |          |         |                              | release; |
      | 3.9.2    | AA04907 | c12k-os-mbi-3.9.2.CSCto45095 | Migrate  |
      |          |         |                              | to       |
      |          |         |                              | 4.0.3,   |
      |          |         |                              | 4.1.1 or |
      |          |         |                              | later.   |
      | Affected |         |                              | First    |
      | 4.0.x    | SMU ID  | SMU NAME                     | Fixed    |
      | Based    |         |                              | Release  |
      | Releases |         |                              |          |
      | 4.0.0    | None    | No SMU available; Contact    | 4.0.3    |
      |          |         | your Support Organization    |          |
      | 4.0.1    | AA04884 | c12k-4.0.1.CSCto45095        | 4.0.3    |
      | 4.0.3    | Not Affected                                      |
      | Affected |         |                              | First    |
      | 4.1.x    | SMU ID  | SMU NAME                     | Fixed    |
      | Based    |         |                              | Release  |
      | Releases |         |                              |          |
      | 4.1.0    | None    | No SMU available; Contact    | 4.1.1    |
      |          |         | your Support Organization    |          |
      | 4.1.1    | Not Affected                                      |
      There are no workarounds for this vulnerability.
      Using Infrastructure Access Control Lists (iACLs) may help limit the
      attack surface of this vulnerability. Although it is often difficult
      to block traffic that transits a network, it is possible to identify
      traffic that should never be allowed to target infrastructure devices
      and block that traffic at the border of networks. As a network
      security best practice, iACLs should be considered a long-term
      addition to good network security. Because some of the packets used
      in this vulnerability could utilize UDP as a transport, it could be
      possible to spoof the sender's IP address, which may defeat ACLs that
      permit communication to these ports from trusted IP addresses.
      Unicast RPF should be considered to be used in conjunction to offer a
      better mitigation solution.
      For more information on iACLs, consult the document "Limit Network
      Access with Access Control Lists" at the following location: 
      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:
      or as otherwise set forth at Cisco.com Downloads at:
      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:
      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 discovered when handling customer support
      Status of this Notice: FINAL
      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.
      This advisory is posted on Cisco's worldwide website at:
      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      | 2011-May-25 | 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:
      This includes instructions for press inquiries regarding Cisco security notices.
      All Cisco security advisories are available at:
      Copyright 2010-2011 Cisco Systems, Inc. All rights reserved.
      -----BEGIN PGP SIGNATURE-----
      Version: GnuPG v1.4.5 (SunOS)
      -----END PGP SIGNATURE-----