[apops] Cisco Security Advisory: Cisco IOS Software RSVP Denial of Servi

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  • Subject: [apops] Cisco Security Advisory: Cisco IOS Software RSVP Denial of Service Vulnerability
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 28 Mar 2012 12:20:57 -0400
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      Cisco Security Advisory: Cisco IOS Software RSVP Denial of Service Vulnerability
      
      Advisory ID: cisco-sa-20120328-rsvp
      
      Revision 1.0
      
      For Public Release 2012 March 28 16:00  UTC (GMT)
      
      +---------------------------------------------------------------------
      
      Summary
      =======
      
      Cisco IOS Software and Cisco IOS XE Software contain a vulnerability
      in the RSVP feature when used on a device configured with VPN routing
      and forwarding (VRF) instances. This vulnerability could allow an
      unauthenticated, remote attacker to cause an interface wedge, which
      can lead to loss of connectivity, loss of routing protocol adjacency,
      and other denial of service (DoS) conditions. This vulnerability
      could be exploited repeatedly to cause an extended DoS condition.
      
      A workaround is available to mitigate this vulnerability.
      
      Cisco has released free software updates that address this
      vulnerability. This advisory is available at the following link: 
      http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-rsvp
      
      
      Note: The March 28, 2012, Cisco IOS Software Security Advisory
      bundled publication includes nine Cisco Security Advisories. Each
      advisory lists the Cisco IOS Software releases that correct the
      vulnerability or vulnerabilities detailed in the advisory as well as
      the Cisco IOS Software releases that correct all vulnerabilities in
      the March 2012 bundled publication.
      
      Individual publication links are in "Cisco Event Response:
      Semi-Annual Cisco IOS Software Security Advisory Bundled Publication"
      at the following link:
      
      http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_mar12.html
      
      
      Affected Products
      =================
      
      Vulnerable Products
      +------------------
      
      Only devices with specific configurations are affected. Cisco devices
      that are running affected Cisco IOS Software or Cisco IOS XE Software
      versions are vulnerable when they are configured with RSVP and also
      have one or more VRF interfaces. A device is vulnerable if both the
      following criteria are met:
      
        * At least one VRF is configured without RSVP
        * At least one other interface (physical or virtual), not in the
          same VRF, is configured with RSVP
      
      Some example scenarios are as follows:
      
        * RSVP-Traffic Engineering (RSVP-TE) in Multiprotocol Label
          Switching (MPLS) infrastructures
        * Multi-VRF infrastructures
        * VRF-Lite infrastructures
      
      To determine the Cisco IOS Software release that is running on a
      Cisco product, administrators can log in to the device and issue the 
      show version command to display the system banner. The system banner
      confirms that the device is running Cisco IOS Software by displaying
      text similar to "Cisco Internetwork Operating System Software" or
      "Cisco IOS Software." The image name displays in parentheses,
      followed by "Version" and the Cisco IOS Software release name. Other
      Cisco devices do not have the show version command or may provide
      different output.
      
      The following example identifies a Cisco product that is running
      Cisco IOS Software Release 15.0(1)M1 with an installed image name of
      C3900-UNIVERSALK9-M:
      
      Router> show version 
      Cisco IOS Software, C3900 Software (C3900-UNIVERSALK9-M), Version 15.0(1)M1, RELEASE SOFTWARE (fc1)
      Technical Support: http://www.cisco.com/techsupport 
      Copyright (c) 1986-2009 by Cisco Systems, Inc.
      Compiled Wed 02-Dec-09 17:17 by prod_rel_team
      !--- output truncated 
      
      Additional information about Cisco IOS Software release naming
      conventions is available in "White Paper: Cisco IOS and NX-OS
      Software Reference Guide" at:
      http://www.cisco.com/web/about/security/intelligence/ios-ref.html
      
      Products Confirmed Not Vulnerable
      +--------------------------------
      
      Cisco IOS-XR software is not affected by this vulnerability.
      
      No other Cisco products are currently known to be affected by this
      vulnerability.
      
      Details
      =======
      
      Cisco IOS Software and Cisco IOS XE Software contain a vulnerability
      in the RSVP feature when used on a device configured with VPN routing
      and forwarding (VRF) instances.  This vulnerability could allow an
      unauthenticated, remote attacker to cause an interface wedge, which
      can lead to loss of connectivity, loss of routing protocol adjacency,
      and other denial of service (DoS) conditions.  This vulnerability
      could be exploited repeatedly to cause an extended DoS condition.
      
      A device is vulnerable if it is configured with VRF and none of the
      interfaces in that VRF have RSVP enabled, but any other interface
      (physical or virtual) does have RSVP enabled.
      
      An attacker with some knowledge of the affected infrastructure
      could exploit this vulnerability by sending RSVP packets to
      vulnerable devices. Successful exploitation of the vulnerability
      could allow an attacker to wedge the receive queue of any RSVP
      ingress interface.
      
      A workaround is available to mitigate this vulnerability.
      
      In devices that meet the vulnerable configuration criteria, valid
      RSVP packets could trigger this vulnerability. An attacker with
      knowledge of the infrastructure could craft valid RSVP packets with
      set conditions to exploit this vulnerability. Recovery from this
      interface queue wedge requires a reload of the device.
      
      An interface queue wedge is a class of vulnerability in which certain
      packets are received and queued by a Cisco IOS router or switch but,
      due to a processing error, are never removed from the queue.
      
      For more information about queue wedges and a few detection
      mechanisms that may be used to identify a blocked interface on Cisco
      IOS Software (including a white paper describing how this condition
      can be detected using SNMP) see:
      http://blogs.cisco.com/security/comments/cisco_ios_queue_wedges_explained
      
      This vulnerability has been documented in Cisco bug ID CSCts80643
      and has been assigned the Common Vulnerabilities and Exposures (CVE) 
      ID CVE-2012-1311.
      
      Vulnerability Scoring Details
      =============================
      
      Cisco has scored the vulnerability in this advisory based on the
      Common Vulnerability Scoring System (CVSS). The CVSS scoring in this
      security advisory is in accordance with CVSS version 2.0.
      
      CVSS is a standards-based scoring method that conveys vulnerability
      severity and helps organizations determine the urgency and priority
      of a response.
      
      Cisco has provided a base and temporal score. Customers can also
      compute environmental scores that help determine the impact of the
      vulnerability in their own networks.
      
      Cisco has provided additional information regarding CVSS at the
      following link:
      
      http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html
      
      Cisco has also provided a CVSS calculator to compute the
      environmental impact for individual networks at the following link:
      
      http://intellishield.cisco.com/security/alertmanager/cvss
      
      * CSCts80643 - Cisco IOS Software RSVP Denial of Service 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
      
      
      Impact
      ======
      
      Successful exploitation of this vulnerability will result in an
      interface queue wedge, which can lead to loss of connectivity, loss
      of routing protocol adjacency, and other DoS conditions. This
      vulnerability could be exploited repeatedly to cause an extended DoS
      condition.
      
      Software Versions and Fixes
      ===========================
      
      When considering software upgrades, customers are advised to consult
      the Cisco Security Advisories and Responses archive at:
      http://www.cisco.com/go/psirt and review subsequent advisories to 
      determine exposure and a complete upgrade solution.
      
      In all cases, customers should ensure that the devices to be upgraded
      contain sufficient memory and confirm that current hardware and
      software configurations will continue to be supported properly by the
      new release. If the information is not clear, customers are advised
      to contact the Cisco Technical Assistance Center (TAC) or their
      contracted maintenance providers.
      
      Cisco IOS Software
      +-----------------
      
      Each row of the following Cisco IOS Software table corresponds to a
      Cisco IOS Software train. If a particular train is vulnerable, the
      earliest releases that contain the fix are listed in the First Fixed
      Release column. The First Fixed Release for All Advisories in the
      March 2012 Bundled Publication column lists the earliest possible
      releases that correct all the published vulnerabilities in the Cisco
      IOS Software Security Advisory bundled publication. Cisco recommends
      upgrading to the latest available release, where possible.
      
      The Cisco IOS Software Checker allows customers to search for Cisco
      Security Advisories that address specific Cisco IOS Software
      releases. This tool is available on the Cisco Security Intelligence
      Operations (SIO) portal at:
      http://tools.cisco.com/security/center/selectIOSVersion.x
      
      
      +--------------------------------------------------------------------+
      |  Major   |              Availability of Repaired Releases          |
      | Release  |                                                         |
      |----------+---------------------------------------------------------|
      | Affected |                            |First Fixed Release for All |
      |12.0-Based|    First Fixed Release     |Advisories in the March 2012|
      | Releases |                            |Cisco IOS Software Security |
      |          |                            |Advisory Bundled Publication|
      |--------------------------------------------------------------------|
      |             There are no affected 12.0 based releases              |
      |--------------------------------------------------------------------|
      | Affected |                            |First Fixed Release for All |
      |12.2-Based|    First Fixed Release     |Advisories in the March 2012|
      | Releases |                            |Cisco IOS Software Security |
      |          |                            |Advisory Bundled Publication|
      |--------------------------------------------------------------------|
      |             There are no affected 12.2 based releases              |
      |--------------------------------------------------------------------|
      | Affected |                            |First Fixed Release for All |
      |12.3-Based|    First Fixed Release     |Advisories in the March 2012|
      | Releases |                            |Cisco IOS Software Security |
      |          |                            |Advisory Bundled Publication|
      |--------------------------------------------------------------------|
      |             There are no affected 12.3 based releases              |
      |--------------------------------------------------------------------|
      | Affected |                            |First Fixed Release for All |
      |12.4-Based|    First Fixed Release     |Advisories in the March 2012|
      | Releases |                            |Cisco IOS Software Security |
      |          |                            |Advisory Bundled Publication|
      |--------------------------------------------------------------------|
      |             There are no affected 12.4 based releases              |
      |--------------------------------------------------------------------|
      | Affected |                            |First Fixed Release for All |
      |15.0-Based|    First Fixed Release     |Advisories in the March 2012|
      | Releases |                            |Cisco IOS Software Security |
      |          |                            |Advisory Bundled Publication|
      |----------+----------------------------+----------------------------|
      |15.0M     |15.0(1)M8                   |15.0(1)M8                   |
      |----------+----------------------------+----------------------------|
      |          |                            |Vulnerable; contact your    |
      |          |                            |support organization per the|
      |15.0MR    |Not vulnerable              |instructions in Obtaining   |
      |          |                            |Fixed Software section of   |
      |          |                            |this advisory.              |
      |----------+----------------------------+----------------------------|
      |          |                            |Vulnerable; contact your    |
      |          |                            |support organization per the|
      |15.0MRA   |Not vulnerable              |instructions in Obtaining   |
      |          |                            |Fixed Software section of   |
      |          |                            |this advisory.              |
      |----------+----------------------------+----------------------------|
      |          |Not vulnerable              |15.0(1)S5                   |
      |15.0S     |Cisco IOS XE devices: Please|Cisco IOS XE devices: Please|
      |          |see Cisco IOS XE Software   |see Cisco IOS XE Software   |
      |          |Availability                |Availability                |
      |----------+----------------------------+----------------------------|
      |15.0SA    |Not vulnerable              |Not vulnerable              |
      |----------+----------------------------+----------------------------|
      |15.0SE    |Not vulnerable              |15.0(1)SE1                  |
      |----------+----------------------------+----------------------------|
      |          |Not vulnerable              |15.0(2)SG2                  |
      |15.0SG    |Cisco IOS XE devices: Please|Cisco IOS XE devices: Please|
      |          |see Cisco IOS XE Software   |see Cisco IOS XE Software   |
      |          |Availability                |Availability                |
      |----------+----------------------------+----------------------------|
      |15.0SY    |15.0(1)SY1                  |15.0(1)SY1                  |
      |----------+----------------------------+----------------------------|
      |15.0XA    |Vulnerable; First fixed in  |Vulnerable; First fixed in  |
      |          |Release 15.1T               |Release 15.1T               |
      |----------+----------------------------+----------------------------|
      |          |Cisco IOS XE devices: Please|Cisco IOS XE devices: Please|
      |15.0XO    |see Cisco IOS XE Software   |see Cisco IOS XE Software   |
      |          |Availability                |Availability                |
      |----------+----------------------------+----------------------------|
      | Affected |                            |First Fixed Release for All |
      |15.1-Based|    First Fixed Release     |Advisories in the March 2012|
      | Releases |                            |Cisco IOS Software Security |
      |          |                            |Advisory Bundled Publication|
      |----------+----------------------------+----------------------------|
      |15.1EY    |15.1(2)EY2                  |15.1(2)EY2                  |
      |----------+----------------------------+----------------------------|
      |15.1GC    |15.1(2)GC2                  |15.1(2)GC2                  |
      |----------+----------------------------+----------------------------|
      |15.1M     |15.1(4)M3                   |15.1(4)M4; Available on     |
      |          |15.1(4)M3a                  |30-MAR-12                   |
      |----------+----------------------------+----------------------------|
      |          |Vulnerable; contact your    |Vulnerable; contact your    |
      |          |support organization per the|support organization per the|
      |15.1MR    |instructions in Obtaining   |instructions in Obtaining   |
      |          |Fixed Software section of   |Fixed Software section of   |
      |          |this advisory.              |this advisory.              |
      |----------+----------------------------+----------------------------|
      |          |15.1(3)S2                   |15.1(3)S2                   |
      |15.1S     |Cisco IOS XE devices: Please|Cisco IOS XE devices: Please|
      |          |see Cisco IOS XE Software   |see Cisco IOS XE Software   |
      |          |Availability                |Availability                |
      |----------+----------------------------+----------------------------|
      |          |Not vulnerable              |Not vulnerable              |
      |15.1SG    |Cisco IOS XE devices: Please|Cisco IOS XE devices: Please|
      |          |see Cisco IOS XE Software   |see Cisco IOS XE Software   |
      |          |Availability                |Availability                |
      |----------+----------------------------+----------------------------|
      |          |Vulnerable; contact your    |Vulnerable; contact your    |
      |          |support organization per the|support organization per the|
      |15.1SNG   |instructions in Obtaining   |instructions in Obtaining   |
      |          |Fixed Software section of   |Fixed Software section of   |
      |          |this advisory.              |this advisory.              |
      |----------+----------------------------+----------------------------|
      |15.1SNH   |Not vulnerable              |Not vulnerable              |
      |----------+----------------------------+----------------------------|
      |          |15.1(1)T5; Available on     |                            |
      |          |18-MAY-12                   |                            |
      |15.1T     |15.1(2)T5; Available on     |15.1(3)T3                   |
      |          |27-APR-12                   |                            |
      |          |15.1(3)T3                   |                            |
      |----------+----------------------------+----------------------------|
      |15.1XB    |Vulnerable; First fixed in  |Vulnerable; First fixed in  |
      |          |Release 15.1T               |Release 15.1T               |
      |----------+----------------------------+----------------------------|
      | Affected |                            |First Fixed Release for All |
      |15.2-Based|    First Fixed Release     |Advisories in the March 2012|
      | Releases |                            |Cisco IOS Software Security |
      |          |                            |Advisory Bundled Publication|
      |--------------------------------------------------------------------|
      |             There are no affected 15.2 based releases              |
      +--------------------------------------------------------------------+
       
      
      Cisco IOS XE Software
      +--------------------
      
      Cisco IOS XE Software is affected by the vulnerability that is
      disclosed in this document.
      
      +---------------------------------------+
      |          |             | First Fixed  |
      |          |             | Release for  |
      |          |             |     All      |
      |  Cisco   |             |  Advisories  |
      |  IOS XE  | First Fixed | in the March |
      | Software |   Release   |  2012 Cisco  |
      | Release  |             | IOS Software |
      |          |             |   Security   |
      |          |             |   Advisory   |
      |          |             |   Bundled    |
      |          |             | Publication  |
      |----------+-------------+--------------|
      |          |             | Vulnerable;  |
      | 2.1.x    | Not         | migrate to   |
      |          | vulnerable  | 3.4.2S or    |
      |          |             | later.       |
      |----------+-------------+--------------|
      |          |             | Vulnerable;  |
      | 2.2.x    | Not         | migrate to   |
      |          | vulnerable  | 3.4.2S or    |
      |          |             | later.       |
      |----------+-------------+--------------|
      |          |             | Vulnerable;  |
      | 2.3.x    | Not         | migrate to   |
      |          | vulnerable  | 3.4.2S or    |
      |          |             | later.       |
      |----------+-------------+--------------|
      |          |             | Vulnerable;  |
      | 2.4.x    | Not         | migrate to   |
      |          | vulnerable  | 3.4.2S or    |
      |          |             | later.       |
      |----------+-------------+--------------|
      |          |             | Vulnerable;  |
      | 2.5.x    | Not         | migrate to   |
      |          | vulnerable  | 3.4.2S or    |
      |          |             | later.       |
      |----------+-------------+--------------|
      |          |             | Vulnerable;  |
      | 2.6.x    | Not         | migrate to   |
      |          | vulnerable  | 3.4.2S or    |
      |          |             | later.       |
      |----------+-------------+--------------|
      |          |             | Vulnerable;  |
      | 3.1.xS   | Not         | migrate to   |
      |          | vulnerable  | 3.4.2S or    |
      |          |             | later.       |
      |----------+-------------+--------------|
      |          |             | Vulnerable;  |
      | 3.1xSG   | Not         | migrate to   |
      |          | vulnerable  | 3.2.2SG or   |
      |          |             | later.       |
      |----------+-------------+--------------|
      |          | Vulnerable; | Vulnerable;  |
      | 3.2.xS   | migrate to  | migrate to   |
      |          | 3.4.2S or   | 3.4.2S or    |
      |          | later.      | later.       |
      |----------+-------------+--------------|
      | 3.2xSG   | Not         | 3.2.2SG      |
      |          | vulnerable  |              |
      |----------+-------------+--------------|
      |          | Vulnerable; | Vulnerable;  |
      | 3.3.xS   | migrate to  | migrate to   |
      |          | 3.4.2S or   | 3.4.2S or    |
      |          | later.      | later.       |
      |----------+-------------+--------------|
      | 3.3.xSG  | Not         | Not          |
      |          | Vulnerable  | Vulnerable   |
      |----------+-------------+--------------|
      | 3.4.xS   | 3.4.2S      | 3.4.2S       |
      |----------+-------------+--------------|
      | 3.5.xS   | Not         | 3.5.1S       |
      |          | vulnerable  |              |
      |----------+-------------+--------------|
      | 3.6.xS   | Not         | Not          |
      |          | vulnerable  | vulnerable   |
      +---------------------------------------+
      
      For a mapping of Cisco IOS XE Software releases to Cisco IOS Software
      releases, refer to Cisco IOS XE 2 Release Notes, Cisco IOS XE 3S
      Release Notes, and Cisco IOS XE 3SG Release Notes.
      
      
      Cisco IOS XR Software
      +--------------------
      
      Cisco IOS XR Software is not affected by any of the vulnerabilities
      disclosed in the March 2012 Cisco IOS Software Security Advisory
      Bundled Publication.
      
      
      Workarounds
      ===========
      
      It is possible to mitigate the vulnerability in this advisory by
      applying the global configuration command ip rsvp listener vrf 
      vrf-name ip-address 0 0 announce, where the IP address is one that
      does not exist on the device or in the routing tables.
      
      Obtaining Fixed Software
      ========================
      
      Cisco has released free software updates that address the
      vulnerability described in this advisory. Prior to deploying
      software, customers are advised to consult their maintenance
      providers or check the software for feature set compatibility and
      known issues that are specific to their environments.
      
      Customers may only install and expect support for feature sets they
      have purchased. By installing, downloading, accessing, or otherwise
      using such software upgrades, customers agree to follow the terms of
      the Cisco software license at:
      http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html
      or as set forth 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, upgrades should be
      obtained through the Software Center on Cisco.com at http://www.cisco.com
      
      Customers Using Third-Party Support Organizations
      +------------------------------------------------
      
      Customers with Cisco products that 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 organization for assistance with the appropriate
      course of action.
      
      The effectiveness of any workaround or fix depends on specific
      customer situations, such as product mix, network topology, traffic
      behavior, and organizational mission. Because of the variety of
      affected products and releases, customers should consult their
      service providers or support organizations to ensure that any applied
      workaround or fix is the most appropriate in the intended network
      before it is deployed.
      
      Customers Without Service Contracts
      +----------------------------------
      
      Customers who purchase directly from Cisco but do not hold a Cisco
      service contract and customers who make purchases through third-party
      vendors but are unsuccessful in obtaining fixed software through
      their point of sale should obtain upgrades by contacting the Cisco
      Technical Assistance Center (TAC):
      
        * +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 the product serial number available and be
      prepared to provide the URL of this advisory as evidence of
      entitlement to a free upgrade. Customers without service contracts
      should request free upgrades through the TAC.
      
      Refer to Cisco Worldwide Contacts at:
      http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html 
      for additional TAC contact information, including localized telephone 
      numbers, instructions, and e-mail addresses for support in various languages.
      
      Exploitation and Public Announcements
      =====================================
      
      The Cisco Product Security Incident Response Team (PSIRT) is not
      aware of any public announcements or malicious use of the
      vulnerability that is described in this advisory.
      
      This vulnerability was discovered by Cisco during internal testing.
      
      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 the Cisco Security Intelligence Operations
      portal at the following link:
      
      http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-rsvp
      
      Additionally, a text version of this advisory is clear signed with
      the Cisco PSIRT PGP key and circulated among the following e-mail
      addresses:
      
        * 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
      
      Future updates of this advisory, if any, will reside on Cisco.com but
      may not be announced on mailing lists. Users can monitor this
      advisory's URL for any updates.
      
      
      Revision History
      ================
      
      +---------------------------------------+
      | Revision |               | Initial    |
      | 1.0      | 2012-March-28 | public     |
      |          |               | release    |
      +---------------------------------------+
      
      Cisco Security Procedures
      =========================
      
      Complete information about reporting security vulnerabilities in
      Cisco products, obtaining assistance with security incidents, and
      registering to receive security information from Cisco is available
      on Cisco.com at:
      http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html
      This web page includes instructions for press inquiries regarding Cisco 
      Security Advisories.
      
      All Cisco Security Advisories are available at:
      http://www.cisco.com/go/psirt
      
      
      +--------------------------------------------------------------------
      Copyright 2010-2012 Cisco Systems, Inc. All rights reserved.
      +--------------------------------------------------------------------
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