var-201008-0143
Vulnerability from variot

The SIPStationInit implementation in Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 6.1SU before 6.1(5)SU1, 7.0SU before 7.0(2a)SU3, 7.1SU before 7.1(3b)SU2, 7.1 before 7.1(5), and 8.0 before 8.0(1) allows remote attackers to cause a denial of service (process failure) via a malformed SIP message, aka Bug ID CSCtd17310. Cisco Unified Communications Manager is prone to a denial-of-service vulnerability. An attacker can exploit this issue to cause an interruption in voice services, denying service to legitimate users. This issue is tracked by Cisco Bug ID CSCtd17310.

Cisco has released free software updates that address these vulnerabilities. There are no workarounds for 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. All SIP ports (TCP ports 5060 and 5061, UDP ports 5060 and 5061) are affected.

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

CSCtd17310 - potential core dump issue in SIPStationInit code

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

CSCtf66305 - CCM Coredump From SendCombinedStatusInfo on Fuzzed REGISTER Message

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.

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.

It is possible to mitigate this vulnerability by implementing filtering on screening devices and permitting access to TCP ports 5060 and 5061 and to UDP ports 5060 and 5061 only from networks that require SIP access to Cisco Unified Communications Manager servers. Use the following instructions to change the ports from their default values:

Step 1: Log into the Cisco Unified Communications Manager Administration web interface.

Step 3: Change the SIP Phone Port and SIP Phone Secure Port fields to a non-standard port and click Save.

The SIP Phone Port, which is set to 5060 by default, refers to the TCP and UDP ports on which the Cisco Unified Communications Manager listens for normal SIP messages. SIP Phone Secure Port, which is set to 5061 by default, refers to the TCP port on which the Cisco Unified Communications Manager listens for SIP over Transport Layer Security (TLS) messages. For information on how to restart the service, refer to the "Restarting the Cisco CallManager Service" section of the administration guide at:

http://www.cisco.com/en/US/docs/voice_ip_comm/cucmbe/admin/7_0_1/ccmcfg/b03dpi.html#wp1075124

Additional mitigation techniques that can be deployed on Cisco devices within the network are available in the Cisco Applied Mitigation Bulletin companion document for this advisory:

http://www.cisco.com/warp/public/707/cisco-amb-20100825-cucm-cup.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@cisco.com or security-alert@cisco.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@cisco.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-20100825-cucm.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@cisco.com
  • first-bulletins@lists.first.org
  • bugtraq@securityfocus.com
  • vulnwatch@vulnwatch.org
  • cisco@spot.colorado.edu
  • cisco-nsp@puck.nether.net
  • full-disclosure@lists.grok.org.uk
  • comp.dcom.sys.cisco@newsgate.cisco.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-August-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:

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:

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    "data": "The SIPStationInit implementation in Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 6.1SU before 6.1(5)SU1, 7.0SU before 7.0(2a)SU3, 7.1SU before 7.1(3b)SU2, 7.1 before 7.1(5), and 8.0 before 8.0(1) allows remote attackers to cause a denial of service (process failure) via a malformed SIP message, aka Bug ID CSCtd17310. Cisco Unified Communications Manager is prone to a denial-of-service vulnerability. \nAn attacker can exploit this issue to cause an interruption in voice services, denying service to legitimate users. \nThis issue is tracked by Cisco Bug ID CSCtd17310. \n\nCisco has released free software updates that address these\nvulnerabilities. There are no workarounds for these vulnerabilities. No other Cisco products are currently known to\nbe affected by these vulnerabilities. \n\nDetails\n=======\n\nCisco Unified Communications Manager is the call processing component\nof the Cisco IP Telephony solution that extends enterprise telephony\nfeatures and functions to packet telephony network devices, such as\nIP phones, media processing devices, VoIP gateways, and multimedia\napplications. All SIP ports (TCP ports 5060 and 5061, UDP ports 5060 and\n5061) are affected. \n\nVulnerability Scoring Details\n=============================\n\nCisco has provided scores for the vulnerabilities in this advisory\nbased on the Common Vulnerability Scoring System (CVSS). The CVSS\nscoring in this Security Advisory is done in accordance with CVSS\nversion 2.0. \n\nCVSS is a standards-based scoring method that conveys vulnerability\nseverity and helps determine urgency and priority of response. \n\nCisco has provided a base and temporal score. Customers can then\ncompute environmental scores to assist in determining the impact of\nthe vulnerability in individual networks. \n\nCisco has provided an FAQ to answer additional questions regarding\nCVSS at:\n\nhttp://www.cisco.com/web/about/security/intelligence/cvss-qandas.html\n\nCisco has also provided a CVSS calculator to help compute the\nenvironmental impact for individual networks at:\n\nhttp://intellishield.cisco.com/security/alertmanager/cvss\n\nCSCtd17310 - potential core dump issue in SIPStationInit code\n\nCVSS Base Score - 7.8\n\nAccess Vector           - Network\nAccess Complexity       - Low\nAuthentication          - None\nConfidentiality Impact  - None\nIntegrity Impact        - None\nAvailability Impact     - Complete\n\nCVSS Temporal Score - 6.4\n\nExploitability          - Functional\nRemediation Level       - Official-Fix\nReport Confidence       - Confirmed\n\nCSCtf66305 - CCM Coredump From SendCombinedStatusInfo on\nFuzzed REGISTER Message\n\nCVSS Base Score - 7.8\n\nAccess Vector           - Network\nAccess Complexity       - Low\nAuthentication          - None\nConfidentiality Impact  - None\nIntegrity Impact        - None\nAvailability Impact     - Complete\n\nCVSS Temporal Score - 6.4\n\nExploitability          - Functional\nRemediation Level       - Official-Fix\nReport Confidence       - Confirmed\n\nImpact\n======\n\nSuccessful exploitation of the vulnerabilities that are described in\nthis advisory could result in the interruption of voice services. \n\nSoftware Versions and Fixes\n===========================\n\nWhen considering software upgrades, also consult:\n\nhttp://www.cisco.com/go/psirt\n\nand any subsequent advisories to determine exposure and a\ncomplete upgrade solution. \n\nIn all cases, customers should exercise caution to be certain the\ndevices to be upgraded contain sufficient memory and that current\nhardware and software configurations will continue to be supported\nproperly by the new release. If the information is not clear, contact\nthe Cisco Technical Assistance Center (TAC) or your contracted\nmaintenance provider for assistance. \n\n+---------------------------------------+\n|      Cisco Unified      | Recommended |\n|  Communication Manager  |   Release   |\n|         Version         |             |\n|-------------------------+-------------|\n| 6.x                     | 6.1(5)SU1   |\n|-------------------------+-------------|\n| 7.x                     | 7.1(5b)SU2  |\n|-------------------------+-------------|\n| 8.x                     | 8.0(3a)     |\n+---------------------------------------+\n\nNote: The recommended releases listed in the table above are the\nlatest Cisco Unified Communications Manager versions available at the\npublication of this advisory, and each release includes software\nfixes for all the vulnerabilities described in this advisory. \n\nIt is possible to mitigate this vulnerability by implementing\nfiltering on screening devices and permitting access to TCP ports\n5060 and 5061 and to UDP ports 5060 and 5061 only from networks that\nrequire SIP access to Cisco Unified Communications Manager servers. Use the following instructions to change the ports from their\ndefault values:\n\nStep 1: Log into the Cisco Unified Communications Manager\nAdministration web interface. \n\nStep 3: Change the SIP Phone Port and SIP Phone Secure Port fields to\na non-standard port and click Save. \n\nThe SIP Phone Port, which is set to 5060 by default, refers to the\nTCP and UDP ports on which the Cisco Unified Communications Manager\nlistens for normal SIP messages. SIP Phone Secure Port, which is set\nto 5061 by default, refers to the TCP port on which the Cisco Unified\nCommunications Manager listens for SIP over Transport Layer Security\n(TLS) messages. For information on how to restart the\nservice, refer to the \"Restarting the Cisco CallManager Service\"\nsection of the administration guide at:\n\nhttp://www.cisco.com/en/US/docs/voice_ip_comm/cucmbe/admin/7_0_1/ccmcfg/b03dpi.html#wp1075124\n\nAdditional mitigation techniques that can be deployed on Cisco\ndevices within the network are available in the Cisco Applied\nMitigation Bulletin companion document for this advisory:\n\nhttp://www.cisco.com/warp/public/707/cisco-amb-20100825-cucm-cup.shtml\n\nObtaining Fixed Software\n========================\n\nCisco has released free software updates that address these\nvulnerabilities. Prior to deploying software, customers should\nconsult their maintenance provider or check the software for feature\nset compatibility and known issues specific to their environment. \n\nCustomers may only install and expect support for the feature sets\nthey have purchased. By installing, downloading, accessing or\notherwise using such software upgrades, customers agree to be bound\nby the terms of Cisco\u0027s software license terms found at:\n\nhttp://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html\n\nor as otherwise set forth at Cisco.com Downloads at:\n\nhttp://www.cisco.com/public/sw-center/sw-usingswc.shtml\n\nDo not contact psirt@cisco.com or security-alert@cisco.com for\nsoftware upgrades. \n\nCustomers with Service Contracts\n+-------------------------------\n\nCustomers with contracts should obtain upgraded software through\ntheir regular update channels. For most customers, this means that\nupgrades should be obtained through the Software Center on Cisco\u0027s\nworldwide website at http://www.cisco.com. \n\nCustomers using Third Party Support Organizations\n+------------------------------------------------\n\nCustomers whose Cisco products are provided or maintained through\nprior or existing agreements with third-party support organizations,\nsuch as Cisco Partners, authorized resellers, or service providers\nshould contact that support organization for guidance and assistance\nwith the appropriate course of action in regards to this advisory. \n\nThe effectiveness of any workaround or fix is dependent on specific\ncustomer situations, such as product mix, network topology, traffic\nbehavior, and organizational mission. Due to the variety of affected\nproducts and releases, customers should consult with their service\nprovider or support organization to ensure any applied workaround or\nfix is the most appropriate for use in the intended network before it\nis deployed. \n\nCustomers without Service Contracts\n+----------------------------------\n\nCustomers who purchase direct from Cisco but do not hold a Cisco\nservice contract, and customers who purchase through third-party\nvendors but are unsuccessful in obtaining fixed software through\ntheir point of sale should acquire upgrades by contacting the Cisco\nTechnical Assistance Center (TAC). TAC contacts are as follows. \n\n  * +1 800 553 2447 (toll free from within North America)\n  * +1 408 526 7209 (toll call from anywhere in the world)\n  * e-mail: tac@cisco.com\n\nCustomers should have their product serial number available and be\nprepared to give the URL of this notice as evidence of entitlement to\na free upgrade. Free upgrades for non-contract customers must be\nrequested through the TAC. \n\nRefer to:\n\nhttp://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html\n\nfor additional TAC contact information, including localized telephone\nnumbers, and instructions and e-mail addresses for use in various\nlanguages. \n\nExploitation and Public Announcements\n=====================================\n\nThe Cisco PSIRT is not aware of any public announcements or malicious\nuse of the vulnerabilities described in this advisory. \n\nAll vulnerabilities described in this advisory were discovered as a\nresult of internal testing conducted by Cisco. \n\nStatus of this Notice: FINAL\n\nTHIS DOCUMENT IS PROVIDED ON AN \"AS IS\" BASIS AND DOES NOT IMPLY ANY\nKIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF\nMERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE\nINFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS\nAT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS\nDOCUMENT AT ANY TIME. \n\nA stand-alone copy or Paraphrase of the text of this document that\nomits the distribution URL in the following section is an\nuncontrolled copy, and may lack important information or contain\nfactual errors. \n\nDistribution\n============\n\nThis advisory is posted on Cisco\u0027s worldwide website at:\n\nhttp://www.cisco.com/warp/public/707/cisco-sa-20100825-cucm.shtml\n\nIn addition to worldwide web posting, a text version of this notice\nis clear-signed with the Cisco PSIRT PGP key and is posted to the\nfollowing e-mail and Usenet news recipients. \n\n  * cust-security-announce@cisco.com\n  * first-bulletins@lists.first.org\n  * bugtraq@securityfocus.com\n  * vulnwatch@vulnwatch.org\n  * cisco@spot.colorado.edu\n  * cisco-nsp@puck.nether.net\n  * full-disclosure@lists.grok.org.uk\n  * comp.dcom.sys.cisco@newsgate.cisco.com\n\nFuture updates of this advisory, if any, will be placed on Cisco\u0027s\nworldwide website, but may or may not be actively announced on\nmailing lists or newsgroups. Users concerned about this problem are\nencouraged to check the above URL for any updates. \n\nRevision History\n================\n\n+---------------------------------------+\n| Revision |                | Initial   |\n| 1.0      | 2010-August-25 | public    |\n|          |                | release.  |\n+---------------------------------------+\n\nCisco Security Procedures\n=========================\n\nComplete information on reporting security vulnerabilities in Cisco\nproducts, obtaining assistance with security incidents, and\nregistering to receive security information from Cisco, is available\non Cisco\u0027s worldwide website at:\n\nhttp://www.cisco.com/en/US/products/products_security_vulnerability_policy.html\n\nThis includes instructions for press inquiries regarding Cisco security\nnotices. 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