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Credit:
The original article can be found at: http://www.cisco.com/warp/public/707/cisco-sa-20100303-cucm.shtml
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Vulnerable Systems:
* Cisco Unified Communications Manager 4.x
* Cisco Unified Communications Manager 5.x
* Cisco Unified Communications Manager 6.x
* Cisco Unified Communications Manager 7.x
Immune Systems:
* Cisco Unified Communications Manager Express
* Cisco Unified Communications Manager 4.3(2)SR2
* Cisco Unified Communications Manager 5.1
* Cisco Unified Communications Manager 6.1(5)
* Cisco Unified Communications Manager 7.1(3b)SU2
* Cisco Unified Communications Manager 8.0(1)
Malformed SCCP Message Vulnerabilities
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Cisco Unified Communications Manager contains two DoS vulnerabilities that involve the processing of SCCP packets. Each vulnerability is triggered by a malformed SCCP message that could cause a critical process to fail, which could result in the disruption of voice services. All SCCP ports (TCP ports 2000 and 2443) are affected.
The first SCCP DoS vulnerability is documented in Cisco Bug ID CSCtc38985 and has been assigned the CVE identifier CVE-2010-0587. This vulnerability is fixed in Cisco Unified Communications Manager versions 4.3(2)SR2, 6.1(5), 7.1(3a)su1 and 8.0(1).
The second SCCP DoS vulnerability is documented in Cisco Bug ID CSCtc47823 and has been assigned the CVE identifier CVE-2010-0588. This vulnerability is fixed in Cisco Unified Communications Manager versions 6.1(5), 7.1(3a)su1 and 8.0(1). Cisco Unified Communications Manager 4.x versions are not affected.
Malformed SIP Message Vulnerabilities
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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, UDP ports 5060 and 5061) are affected.
The first SIP DoS vulnerability is documented in Cisco Bug ID CSCtc37188 and has been assigned the CVE identifier CVE-2010-0590. This vulnerability is fixed in Cisco Unified Communications Manager versions 7.1(3a)su1 and 8.0(1) . Cisco Unified Communications Manager 4.x and 6.x versions are not affected.
The second SIP DoS vulnerability is documented in Cisco Bug ID CSCtc62362 and has been assigned the CVE identifier CVE-2010-0591. The second vulnerability is fixed in Cisco Unified Communications Manager versions 6.1(5), 7.1(3b)SU2 and 8.0(1). Cisco Unified Communications Manager 4.x versions are not affected.
Malformed CTI Manager Message Vulnerability
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The CTI Manager service of Cisco Unified Communications Manager contains a DoS vulnerability. A malformed message sent to the CTI Manager service port (TCP 2748) could cause the CTI Manager service to fail, which could result in the interruption of CTI applications. The CTI Manager service is disabled by default.
The CTI Manager vulnerability is documented in Cisco Bug ID CSCsu31800 and has been assigned the CVE identifier CVE-2010-0592. This vulnerability is fixed in Cisco Unified Communications Manager versions 4.3(2)sr1a, 6.1(3), 7.0(2), 7.1(2) and 8.0(1).
Patch Availability:
Cisco Unified Communications Manager software version 4.3(2)SR2 can be downloaded at the following link:
http://tools.cisco.com/support/downloads/go/PlatformList.x?sftType=Unified+Communications+Manager+Updates&mdfid=280771554&treeName=Voice+and+Unified+Communications&mdfLevel=Software%20Version/Option&url=null&modelName=Cisco+Unified+Communications+Manager+Version+4.3&isPlatform=N&treeMdfId=278875240&modifmdfid=null&imname=&hybrid=Y&imst=N
Cisco Unified Communications Manager software version 6.1(5) can be downloaded at the following link:
http://tools.cisco.com/support/downloads/go/ReleaseType.x?optPlat=&isPlatform=Y&mdfid=281023410&sftType=Unified+Communications+Manager+Updates&treeName=Voice+and+Unified+Communications&modelName=Cisco+Unified+Communications+Manager+Version+6.1&mdfLevel=Software%20Version/Option&treeMdfId=278875240&modifmdfid=null&imname=&hybrid=Y&imst=N
Cisco Unified Communications Manager software version 7.1(3b)SU2 can be downloaded at the following link:
http://tools.cisco.com/support/downloads/go/PlatformList.x?sftType=Unified+Communications+Manager+Updates&mdfid=282421166&treeName=Voice+and+Unified+Communications&mdfLevel=Software%20Version/Option&url=null&modelName=Cisco+Unified+Communications+Manager+Version+7.1&isPlatform=N&treeMdfId=278875240&modifmdfid=null&imname=&hybrid=Y&imst=N
Workaround:
Administrators can mitigate the SCCP- and SIP-related vulnerabilities by implementing filtering on screening devices to permit access to TCP ports 2000 and 2443, and TCP and UDP ports 5060 and 5061 only from networks that require SCCP and SIP access to Cisco Unified Communications Manager appliances.
It is possible to mitigate the CTI Manager vulnerability by disabling the CTI Manager service t is not necessary; however, this workaround will interrupt applications that reply on the CTI Manager service. Administrators can also mitigate the vulnerability by implementing filtering on screening devices to permit access to TCP port 2748 only from networks that require access to the CTI Manager service. Please consult the following documentation for details on disabling Cisco Unified Communications Manager services:
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/service/6_0_1/admin/sasrvact.html#wp1048390
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-20100303-cucm.shtml
CVE Information:
CVE Information:
CVE-2010-0587
CVE-2010-0588
CVE-2010-0590
CVE-2010-0591
CVE-2010-0592
Disclosure Timeline:
2010.03.03: Release of this Advisory
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