[apops] Cisco Security Advisory: Cisco Unified Communications Manager Se

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  • Subject: [apops] Cisco Security Advisory: Cisco Unified Communications Manager Session Initiation Protocol Denial of Service Vulnerabilities
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 22 Sep 2010 18:00:00 +0200
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      Cisco Unified Communications Manager Session Initiation Protocol
      Denial of Service Vulnerabilities
      
      Advisory ID: cisco-sa-20100922-cucmsip
      
      http://www.cisco.com/warp/public/707/cisco-sa-20100922-cucmsip.shtml
      
      Revision 1.0
      
      For Public Release 2010 September 22 1600 UTC (GMT)
      
      - ---------------------------------------------------------------------
      
      Summary
      =======
      
      Cisco Unified Communications Manager contains two denial of service
      (DoS) vulnerabilities that affect the processing of Session
      Initiation Protocol (SIP) messages. Exploitation of these
      vulnerabilities could cause an interruption of voice services.
      
      To address these vulnerabilities, Cisco has released free software
      updates. There is a workaround for these vulnerabilities.
      
      This advisory is posted at 
      http://www.cisco.com/warp/public/707/cisco-sa-20100922-cucmsip.shtml
      
      Note: Cisco IOS Software is also affected by the vulnerabilities
      described in this advisory. A companion advisory for Cisco IOS
      software is available at:
      
      http://www.cisco.com/warp/public/707/cisco-sa-20100922-sip.shtml
      
      Note: The September 22, 2010, Cisco IOS Software Security Advisory
      bundled publication includes six Cisco Security Advisories. Five of
      the advisories address vulnerabilities in Cisco IOS Software and one
      advisory addresses vulnerabilities in Cisco Unified Communications
      Manager. Each advisory lists the releases that correct the
      vulnerability or vulnerabilities detailed in the advisory. The table
      at the following URL lists releases that correct all Cisco IOS
      Software vulnerabilities that have been published on September 22,
      2010, or earlier:
      
      http://www.cisco.com/warp/public/707/cisco-sa-20100922-bundle.shtml
      
      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_sep10.html
      
      Affected Products
      =================
      
      Vulnerable Products
      +------------------
      
      The following products are affected by the vulnerabilities that are
      described in this advisory:
      
        * Cisco Unified Communications Manager 6.x
        * Cisco Unified Communications Manager 7.x
        * Cisco Unified Communications Manager 8.x
      
      Administrators of systems that are running Cisco Unified
      Communications Manager versions 6.x, 7.x and 8.x can determine the
      software version by viewing the main page of the Cisco Unified
      Communications Manager Administration interface. The software version
      can also be determined by running the show version active command via
      the command-line interface.
      
      Products Confirmed Not Vulnerable
      +--------------------------------
      
      Cisco Unified Communications Manager version 4.x is not affected by
      these vulnerabilities. No other Cisco products are currently known to
      be affected by these vulnerabilities.
      
      Details
      =======
      
      Cisco Unified Communications Manager is the call processing component
      of the Cisco IP Telephony solution that extends enterprise telephony
      features and functions to packet telephony network devices such as IP
      phones, media processing devices, VoIP gateways, and multimedia
      applications.
      
      Cisco Unified Communications Manager contains two DoS vulnerabilities
      that involve the processing of SIP messages. Each vulnerability is
      triggered by a malformed SIP message that could cause a critical
      process to fail, which could result in the disruption of voice
      services. All SIP ports (TCP ports 5060 and 5061 and UDP ports 5060
      and 5061) are affected.
      
      The first SIP DoS vulnerability is documented in Cisco Bug ID
      CSCta31358 ( registered customers only) and has been assigned the CVE
      identifier CVE-2010-2835. This vulnerability is fixed in Cisco
      Unified Communications Manager versions 6.1(5), 7.0(2a)su3, 7.1(3b)
      su2, 7.1(5) and 8.0(1). The corresponding IOS defect is CSCta20040.
      
      The second SIP DoS vulnerability is documented in Cisco Bug ID
      CSCtf14987 ( registered customers only) and has been assigned the CVE
      identifier CVE-2010-2834. The second vulnerability is fixed in Cisco
      Unified Communications Manager versions 6.1(5)SU1, 7.1(5) and 8.0(2).
      The corresponding IOS defect is CSCtf72678.
      
      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
      
      CSCta31358 - c3945 GW crashes while testing REFER method with invalid
                   Refer-To header
      
      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
      
      CSCtf14987 - CCM Coredump Generated During UDP SIP Registration Fuzzing 
      
      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 vulnerabilities that are described in
      this advisory could result in the interruption of voice services.
      Cisco Unified Communications Manager will restart the affected
      processes, but repeated attacks may result in a sustained 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.
      
      +---------------------------------------+
      |      Cisco Unified      | Recommended |
      |  Communication Manager  |   Release   |
      |         Version         |             |
      |-------------------------+-------------|
      | 6.x                     | 6.1(5)SU1   |
      |-------------------------+-------------|
      | 7.x                     | 7.1(5b)SU2  |
      |-------------------------+-------------|
      | 8.x                     | 8.0(3a)     |
      +---------------------------------------+
      
      Note: The recommended releases listed in the table above are the
      latest Cisco Unified Communications Manager versions available at the
      publication of this advisory, and each release includes software
      fixes for all the vulnerabilities described in this advisory.
      
      Cisco Unified Communications Manager software can be downloaded at
      the following link:
      
      http://tools.cisco.com/support/downloads/go/Redirect.x?mdfid=268439621
      
      Workarounds
      ===========
      
      For customers who do not use SIP in their environment, there is a
      workaround for these vulnerabilities. Cisco Unified Communication
      Manager versions 6.1(4), 7.1(2) and 8.0(1) introduced the ability to
      disable SIP processing. SIP processing is enabled by default. Use the
      following instructions to disable SIP processing:
      
      Step 1: Log into the Cisco Unified CM Administration web interface.
      
      Step 2: Navigate to System > Service Parameters and select the
      appropriate Cisco Unified Communications Manager server and the
      "Cisco CallManager" service.
      
      Step 3: Change the "SIP Interoperability Enabled" parameter to False,
      and click Save.
      
      Note: For a SIP processing change to take effect, the Cisco
      CallManager Service must be restarted. For information on how to
      restart the service, refer to the "Restarting the Cisco CallManager
      Service" section of the document at:
      
      http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/7_1_2/ccmcfg/b03dpi.html#wp1075124
      
      It is possible to mitigate these vulnerabilities by implementing
      filtering on screening devices and permitting access to TCP ports
      5060 and 5061 and UDP ports 5060 and 5061 only from networks that
      require SIP access to Cisco Unified Communications Manager servers.
      
      Additional mitigations that can be deployed on Cisco devices in the
      network are available in the companion document "Cisco Applied
      Mitigation Bulletin: Identifying and Mitigating Exploitation of the
      Multiple Vulnerabilities in Cisco Voice Products", which is available
      at the following location:
      
      http://www.cisco.com/warp/public/707/cisco-amb-20100922-voice.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/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 vulnerabilities described in this advisory.
      
      All vulnerabilities described in this advisory were discovered as a
      result of internal testing conducted by Cisco.
      
      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-20100922-cucmsip.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      | 2010-September-22 | 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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