Cisco Unified Presence 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 presence services. Cisco has released software updates that address these vulnerabilities. There are no workarounds for these vulnerabilities. This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100825-cup.
Cisco Unified Presence 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 presence services.
Cisco has released software updates that address these vulnerabilities. There are no workarounds for these vulnerabilities.
This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100825-cup.
The following products are affected:
Note: Cisco Unified Presence version 8.0(1) shipped with software fixes for all the vulnerabilities described in this advisory.
Administrators of systems running Cisco Unified Presence can determine the software version by viewing the main page of the Cisco Unified Presence Administration interface. The software version can be determined by running the command show version active using the command line interface (CLI).
No other Cisco products are currently known to be affected by these vulnerabilities.
Cisco Unified Presence 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 presence services. All SIP ports (TCP ports 5060 and 5061, UDP ports 5060 and 5061) are affected.
The first SIP DoS vulnerability is documented in Cisco bug ID CSCtd14474 and has been assigned the CVE identifier CVE-2010-2839. This vulnerability is fixed in Cisco Unified Presence versions 6.0(7) and 7.0(8).
The second SIP DoS vulnerability is documented in Cisco bug ID CSCtd39629 and has been assigned the CVE identifier CVE-2010-2840. This vulnerability is fixed in Cisco Unified Presence versions 6.0(7) and 7.0(8).
There are no workarounds for the vulnerabilities described in this advisory.
It is possible to mitigate these vulnerabilities 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.
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:
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.
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Cisco Unified Presence Version |
Recommended Release |
|---|---|
|
6.0 |
6.0(7) |
|
7.0 |
7.0(8) |
Cisco Unified Presence software can be downloaded at the following link:
http://tools.cisco.com/support/downloads/go/Redirect.x?mdfid=280448682
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.
To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
|
Revision 1.0 |
2010-August-25 |
Initial public release. |
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