Cisco Unified Presence Server Denial of Service Vulnerability

Summary

• Cisco Unified Presence Server (CUPS) contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. Cisco has released software updates that address this vulnerability. A workaround is available to mitigate this vulnerability. This advisory is available at the following link:
  http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130227-cups

Affected Products

• Vulnerable Products

  The following products are affected by the vulnerability that is described in this advisory:

  • Cisco Unified Presence Server 8.6
  • Cisco Unified Communications Manager IM and Presence Service 9.0

  Products Confirmed Not Vulnerable

  No other Cisco products are currently known to be affected by this vulnerability.

Details

• Cisco Unified Presence is a standards-based enterprise platform that brings people together in and across organizations in the most effective way. This open and extensible platform facilitates the highly secure exchange of presence and instant messaging (IM) information between Cisco Unified Communications and other applications.
  
  Denial of Service Vulnerability
  
  Cisco Unified Presence Server (CUPS) contains a vulnerability that could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. An attacker could exploit this issue by sending crafted packets to a Session Initiation Protocol (SIP) port (TCP port 5060) resulting in an increase in CPU utilization that could lead to a disruption of services. This vulnerability is described in Cisco bug ID CSCua89930 (registered customers only), and is assigned the CVE Identifier CVE-2013-1137.

Workarounds

• Filtering traffic from untrusted sources on TCP port 5060 can provide a workaround for this vulnerability.

Fixed Software

• When considering software upgrades, customers are advised to consult the Cisco Security Advisories, Responses, and Notices 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.
  
  Fixes may be obtained from the software download center on cisco.com, which you can access at the following link:
  
  http://software.cisco.com/download/navigator.html
  
  

  Cisco Unified Presence Server Version	Recommended Release
  8.6	8.6.4SU2
  9.0	9.1.1

  
  Fixed versions are 8.6.4SU2 for version 8.6, and 9.1.1 for version 9.0. Version 9.1 is not vulnerable.
  
  Note: The upgrade path for version 9.0 is to version 9.1.1 which is available at the link above.

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 found by Cisco during internal testing.

URL

• http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130227-cups

Revision History

• Revision 1.1	2013-February-28	Corrected affected and fixed versions
  Revision 1.0	2013-February-27	Initial public release.

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