[apops] Cisco Security Advisory: Cisco IOS Software IP Service Level Agr

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  • Subject: [apops] Cisco Security Advisory: Cisco IOS Software IP Service Level Agreement Vulnerability
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 28 Sep 2011 12:00:00 -0400
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      Cisco Security Advisory: Cisco IOS Software IP Service Level
      Agreement Vulnerability
      
      Advisory ID: cisco-sa-20110928-ipsla
      
      Revision 1.0
      
      For Public Release 2011 September 28 1600 UTC (GMT)
      
      +---------------------------------------------------------------------
      
      Summary
      =======
      
      The Cisco IOS IP Service Level Agreement (IP SLA) feature contains a
      denial of service (DoS) vulnerability. The vulnerability is triggered
      when malformed UDP packets are sent to a vulnerable device. The
      vulnerable UDP port numbers depend on the device configuration.
      Default ports are not used for the vulnerable UDP IP SLA operation or
      for the UDP responder ports.
      
      Cisco has released free software updates that address this
      vulnerability.
      
      This advisory is posted at
      http://www.cisco.com/warp/public/707/cisco-sa-20110928-ipsla.shtml.
      
      Note: The September 28, 2011, Cisco IOS Software Security Advisory
      bundled publication includes ten Cisco Security Advisories. Nine of the
      advisories address vulnerabilities in Cisco IOS Software, and one
      advisory addresses a vulnerability in Cisco Unified Communications
      Manager. 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 September 2011 Bundled Publication.
      
      Individual publication links are in "Cisco Event Response: Semiannual
      Cisco IOS Software Security Advisory Bundled Publication" at the
      following link:
      
      http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep11.html
      
      Affected Products
      =================
      
      Vulnerable Products
      +------------------
      
      Cisco devices that are running Cisco IOS Software are vulnerable when
      they are configured for IP SLA, either as responders or as
      originators of vulnerable IP SLA operations.
      
      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 shows output from a device that runs a Cisco
      IOS Software image:
      
          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 the white paper Cisco IOS and NX-OS
      Software Reference Guide available at:
      
      http://www.cisco.com/web/about/security/intelligence/ios-ref.html
      
      Products Confirmed Not Vulnerable
      +--------------------------------
      
      No other Cisco products are currently known to be affected by this
      vulnerability.
      
      Details
      =======
      
      IP SLA is an embedded agent in Cisco IOS Software designed to measure
      and monitor common network performance metrics like jitter, latency
      (delay), and packet loss.
      
      The vulnerability that is described in this document is triggered by
      malformed UDP packets triggered by malformed IP SLA packets sent to
      the vulnerable device and port. A vulnerable device can be an IP SLA
      responder or the source device of a vulnerable IP SLA operation.
      
      This vulnerability is documented in Cisco bug ID CSCtk67073 and has been
      assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2011-3272.
      
      Vulnerable IP SLA Responder Configurations
      +-----------------------------------------
      
      A device configured either as an IP SLA general responder or a
      permanent IP SLA UDP responder is vulnerable.
      
      The general responder processes IP SLA control protocol packets on
      UDP port 1967 and then may dynamically open vulnerable UDP ports
      according to the IP SLA operations requested using the control
      protocol. The configuration for a general responder is as follows:
      
          ip sla responder
      
      The IP SLA UDP permanent responder is also vulnerable. An example
      configuration is as follows:
      
          ip sla responder udp-echo port 300
      
      There is no default UDP port number for the UDP permanent responder
      
      Alternatively, both the general responder and the permanent responder
      can be identified with the "show ip sla responder" command. The general
      responder is vulnerable when it has been enabled. The permanent
      responder is vulnerable only when it has been enabled and the "udpEcho
      Responder" is present. In the Following example, the general responder
      is not vulnerable because it has not been enabled but the permanent
      responder is vulnerable because it has been enabled with a UDP echo
      responder:
      
          Router# show ip sla responder
                  General IP SLA Responder on Control port 1967
          General IP SLA Responder is: Disabled
      
                  Permanent Port IP SLA Responder
          Permanent Port IP SLA Responder is: Enabled
      
          udpEcho Responder: 
            IP Address             Port
            0.0.0.0                 300
      
      Vulnerable IP SLA Source Device Configurations
      +---------------------------------------------
      
      An IP SLA source device is a Cisco IOS device that has at least one
      IP SLA operation configured. To be vulnerable a probe originator
      needs to have at least one scheduled probe that uses either of the
      following IP SLA operations:
      
        * udp-jitter probe
        * udp-echo
      
      A vulnerable IP SLA source device configuration includes all the
      following commands:
      
        * An "ip sla" global configuration command to define an IP SLA
          operation
      
        * Either a "udp-echo" or a "udp-jitter" IP SLA configuration command
      
        * An "ip sla schedule" global configuration command that activates
          one of the probes that uses a vulnerable IP SLA operation
      
      The following examples show a source device that is configured for IP
      SLA UDP echo and UDP jitter probes:
      
          ip sla 201
           udp-echo 192.168.134.21 201
          ip sla schedule 201 start-time now
      
          ip sla 301
           udp-jitter 192.168.134.121 122
          ip sla schedule 301 start-time now
      
      The destination UDP ports for the probes need to be configured. If
      the source UDP port is not configured an available port number will
      be used when the probe is started. A device that originates a
      vulnerable operation will be vulnerable on the source UDP ports of
      the probe and a responder will be vulnerable on the destination UDP
      port used for the probe.
      
      IP SLA probes can be configured using Simple Network Management
      Protocol (SNMP). In that case, by default, the "show running
      configuration" command will not include the IP SLA probe
      configuration. The "show ip sla configuration" command can be used to
      verify whether a probe has been configured either by the command line
      or via SNMP.
      
          Router# show ip sla configuration | include operation
          Type of operation to perform: udp-jitter
          Type of operation to perform: udp-echo
      
      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:
      
      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
      
      
      * CSCtk67073 ("IP SLA Memory Corruption 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 the vulnerability described in this
      document may result in the reload of a vulnerable device. Repeated
      exploitation could result in a DoS condition.
      
      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.
      
      Additionally, the Cisco IOS Software Checker is available on
      the Cisco Security Intelligence Operations (SIO) portal at
      http://tools.cisco.com/security/center/selectIOSVersion.x. It provides
      several features for checking which Security Advisories affect specified
      versions of Cisco IOS Software.
      
      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 For This Advisory column. The First Fixed Release for All
      Advisories in the September 2011 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.
      
      +------------------------------------------------------------+
      |   Major    |         Availability of Repaired Releases     |
      |  Release   |                                               |
      |------------+-----------------------------------------------|
      |  Affected  |                  |  First Fixed Release for   |
      | 12.0-Based |   First Fixed    |   All Advisories in the    |
      |  Releases  |     Release      |   September 2011 Bundled   |
      |            |                  |        Publication         |
      |------------------------------------------------------------|
      | There are no affected 12.0-based releases                  |
      |------------------------------------------------------------|
      |  Affected  |                  |  First Fixed Release for   |
      | 12.1-Based |   First Fixed    |   All Advisories in the    |
      |  Releases  |     Release      |   September 2011 Bundled   |
      |            |                  |        Publication         |
      |------------------------------------------------------------|
      | There are no affected 12.1-based releases                  |
      |------------------------------------------------------------|
      |  Affected  |                  |  First Fixed Release for   |
      | 12.2-Based |   First Fixed    |   All Advisories in the    |
      |  Releases  |     Release      |   September 2011 Bundled   |
      |            |                  |        Publication         |
      |------------------------------------------------------------|
      | There are no affected 12.2-based releases                  |
      |------------------------------------------------------------|
      |  Affected  |                  |  First Fixed Release for   |
      | 12.3-Based |   First Fixed    |   All Advisories in the    |
      |  Releases  |     Release      |   September 2011 Bundled   |
      |            |                  |        Publication         |
      |------------------------------------------------------------|
      | There are no affected 12.3-based releases                  |
      |------------------------------------------------------------|
      |  Affected  |                  |  First Fixed Release for   |
      | 12.4-Based |   First Fixed    |   All Advisories in the    |
      |  Releases  |     Release      |   September 2011 Bundled   |
      |            |                  |        Publication         |
      |------------------------------------------------------------|
      | There are no affected 12.4-based releases                  |
      |------------------------------------------------------------|
      |  Affected  |                  |  First Fixed Release for   |
      | 15.0-Based |   First Fixed    |   All Advisories in the    |
      |  Releases  |     Release      |   September 2011 Bundled   |
      |            |                  |        Publication         |
      |------------------------------------------------------------|
      | There are no affected 15.0-based releases                  |
      |------------------------------------------------------------|
      |  Affected  |                  |  First Fixed Release for   |
      | 15.1-Based |   First Fixed    |   All Advisories in the    |
      |  Releases  |     Release      |   September 2011 Bundled   |
      |            |                  |        Publication         |
      |------------+------------------+----------------------------|
      |            |                  | Vulnerable; contact your   |
      |            |                  | support organization per   |
      | 15.1EY     | Not vulnerable   | the instructions in the    |
      |            |                  | Obtaining Fixed Software   |
      |            |                  | section of this advisory.  |
      |------------+------------------+----------------------------|
      |            | Vulnerable;      | Vulnerable; first fixed in |
      | 15.1GC     | first fixed in   | Release 15.1T              |
      |            | Release 15.1T    |                            |
      |------------+------------------+----------------------------|
      | 15.1M      | Not vulnerable   | 15.1(4)M2; Available on    |
      |            |                  | 30-SEP-11                  |
      |------------+------------------+----------------------------|
      |            |                  | Vulnerable; contact your   |
      |            |                  | support organization per   |
      | 15.1MR     | Not vulnerable   | the instructions in the    |
      |            |                  | Obtaining Fixed Software   |
      |            |                  | section of this advisory.  |
      |------------+------------------+----------------------------|
      |            | 15.1(2)S         | 15.1(2)S2                  |
      |            |                  |                            |
      |            | Cisco IOS XE     | 15.1(3)S                   |
      | 15.1S      | devices: Please  |                            |
      |            | see Cisco IOS-XE | Cisco IOS XE devices:      |
      |            | Software         | Please see Cisco IOS-XE    |
      |            | Availability     | Software Availability      |
      |------------+------------------+----------------------------|
      |            | 15.1(1)T3        | 15.1(1)T4; Available on    |
      |            |                  | 08-DEC-11                  |
      | 15.1T      | 15.1(2)T4        |                            |
      |            |                  | 15.1(2)T4                  |
      |            | 15.1(3)T2        |                            |
      |            |                  | 15.1(3)T2                  |
      |------------+------------------+----------------------------|
      |            | Vulnerable;      | Vulnerable; first fixed in |
      | 15.1XB     | first fixed in   | Release 15.1T              |
      |            | Release 15.1T    |                            |
      |------------+------------------+----------------------------|
      |  Affected  |                  |  First Fixed Release for   |
      | 15.2-Based |   First Fixed    |   All Advisories in the    |
      |  Releases  |     Release      |   September 2011 Bundled   |
      |            |                  |        Publication         |
      |------------------------------------------------------------|
      | There are no affected 15.2-based releases                  |
      +------------------------------------------------------------+
      
      Cisco IOS XE Software
      +--------------------
      
      Cisco IOS XE Software is affected by the vulnerability disclosed in
      this document.
      
      +------------------------------------------------------------+
      |  Cisco  |   First Fixed   |  First Fixed Release for All   |
      | IOS XE  |     Release     |  Advisories in the September   |
      | Release |                 |    2011 Bundled Publication    |
      |---------+-----------------+--------------------------------|
      |         | Vulnerable;     | Vulnerable; migrate to 3.3.2S  |
      | 2.1.x   | migrate to      | or later                       |
      |         | 3.3.2S or later |                                |
      |---------+-----------------+--------------------------------|
      |         | Vulnerable;     | Vulnerable; migrate to 3.3.2S  |
      | 2.2.x   | migrate to      | or later                       |
      |         | 3.3.2S or later |                                |
      |---------+-----------------+--------------------------------|
      |         | Vulnerable;     | Vulnerable; migrate to 3.3.2S  |
      | 2.3.x   | migrate to      | or later                       |
      |         | 3.3.2S or later |                                |
      |---------+-----------------+--------------------------------|
      |         | Vulnerable;     | Vulnerable; migrate to 3.3.2S  |
      | 2.4.x   | migrate to      | or later                       |
      |         | 3.3.2S or later |                                |
      |---------+-----------------+--------------------------------|
      |         | Vulnerable;     | Vulnerable; migrate to 3.3.2S  |
      | 2.5.x   | migrate to      | or later                       |
      |         | 3.3.2S or later |                                |
      |---------+-----------------+--------------------------------|
      |         | Vulnerable;     | Vulnerable; migrate to 3.3.2S  |
      | 2.6.x   | migrate to      | or later                       |
      |         | 3.3.2S or later |                                |
      |---------+-----------------+--------------------------------|
      |         | Vulnerable;     | Vulnerable; migrate to 3.3.2S  |
      | 3.1.xS  | migrate to      | or later                       |
      |         | 3.3.2S or later |                                |
      |---------+-----------------+--------------------------------|
      |         | Vulnerable;     |                                |
      | 3.1.xSG | migrate to      | Vulnerable; migrate to 3.2.0SG |
      |         | 3.2.0SG or      | or later                       |
      |         | later           |                                |
      |---------+-----------------+--------------------------------|
      |         | Vulnerable;     | Vulnerable; migrate to 3.3.2S  |
      | 3.2.xS  | migrate to      | or later                       |
      |         | 3.3.2S or later |                                |
      |---------+-----------------+--------------------------------|
      | 3.2.xSG | Not vulnerable  | Not vulnerable                 |
      |---------+-----------------+--------------------------------|
      | 3.3.xS  | 3.3.0S          | 3.3.2S                         |
      |---------+-----------------+--------------------------------|
      | 3.4.xS  | Not vulnerable  | Not vulnerable                 |
      +------------------------------------------------------------+
      
      For mapping of Cisco IOS XE to Cisco IOS releases, please refer to
      the 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
      in the September 2011 bundled publication.
      
      Workarounds
      ===========
      
      There are no workarounds for this vulnerability, but there are
      mitigations that can be deployed on a general IP SLA responder to
      reduce the exposure to this vulnerability.
      
      General IP SLA Responder Mitigation
      +----------------------------------
      
      For devices that are configured as general responders, a mitigation
      is to restrict IP SLA control packets on UDP port 1967 that are
      addressed to the vulnerable device to permit only trusted probe
      originators to open UDP ports that could be exploited. This can be
      accomplished using techniques such as Infrastructure Access list or
      Control Plane Protection.
      
      For devices configured as general responders, 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:
      
      http://www.cisco.com/warp/public/707/cisco-amb-20110928-ipsla.shtml
      
      IP SLA Permanent Responder Mitigation
      +------------------------------------
      
      For the permanent responder, the mitigation is to filter UDP packets
      addressed to the configured UDP port of each permanent responder to
      permit packets from the IP addresses of trusted devices.
      
      IP SLA Source Devices Mitigation
      +-------------------------------
      
      For IP SLA source devices, a mitigation is to allow only UDP packets
      from trusted devices (that is, devices that are the target of IP SLA
      operations).
      
      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/docs/general/warranty/English/EU1KEN_.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/en/US/support/tsd_cisco_worldwide_contacts.html
      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 during Cisco 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 Cisco's worldwide website at:
      
      http://www.cisco.com/warp/public/707/cisco-sa-20110928-ipsla.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 1.0   | 2011-Sep-28   | Initial 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.
      
      +--------------------------------------------------------------------
      Copyright 2010-2011 Cisco Systems, Inc. All rights reserved.
      +--------------------------------------------------------------------
      
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