Cisco Security Advisory
Multiple Vulnerabilities in Cisco Unified Communications Manager
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Cisco Unified Communications Manager (previously known as Cisco CallManager) contains the following vulnerabilities:
- Three (3) denial of service (DoS) vulnerabilities that affect Session Initiation Protocol (SIP) services
- Directory transversal vulnerability
- Two (2) SQL injection vulnerabilities
Cisco has released free software updates for affected Cisco Unified Communications Manager versions to address the vulnerabilities. A workaround exists only for the SIP DoS vulnerabilities.
This advisory is posted at https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110427-cucm.
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Vulnerable Products
The following products are affected by at least one of 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
Note: Cisco Unified Communications Manager version 5.1 reached end of software maintenance on February 13, 2010. Customers who are using Cisco Unified Communications Manager 5.x versions should contact your Cisco support team for assistance in upgrading to a supported version of Cisco Unified Communications Manager.
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.
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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.
DoS Vulnerabilities in SIP
Cisco Unified Communications Manager contains three 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, resulting 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 CSCti42904 ( registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) identifier CVE-2011-1604. This vulnerability is fixed in Cisco Unified Communications Manager versions 8.5(1), 8.0(3a)su2, 7.1(5b)su3, and 6.1(5)su3.
The second SIP DoS vulnerability is documented in Cisco Bug ID CSCth39586 ( registered customers only) and has been assigned CVE identifier CVE-2011-1605. This vulnerability is fixed in Cisco Unified Communications Manager versions 8.5(1), 8.0(3), 7.1(5b)su2, and 6.1(5)su2.
The third SIP DoS vulnerability is documented in Cisco Bug ID CSCtg62855 ( registered customers only) and has been assigned CVE identifier CVE-2011-1606. This vulnerability is fixed in Cisco Unified Communications Manager versions 8.5(1), 8.0(3), 7.1(5)su1, and 6.1(5)su2.
Directory Transversal Vulnerability
Cisco Unified Communications Manager contains a vulnerability that involves the processing of POST requests. An authenticated, remote attacker with the ability to intercept a packet to the affected device could specify a different location or filename, which may result in the upload of a malicious file. This vulnerability is documented in Cisco Bug ID CSCti81603 ( registered customers only) and has been assigned CVE identifier CVE-2011-1607. The second vulnerability is fixed in Cisco Unified Communications Manager versions 8.5(1), 8.0(3a)su1, 7.1(5b)su3, and 6.1(5)su3.
SQL Injection Vulnerabilities
Cisco Unified Communications Manager is affected by the following SQL injection vulnerabilities:
- The first vulnerability could allow an authenticated, remote attacker to modify the system configuration; create, modify and delete users; or modify the configuration of Cisco Unified Communications Manager. This vulnerability is documented in Cisco Bug ID CSCtg85647 ( registered customers only) and has been assigned CVE identifier CVE-2011-1609. This vulnerability is fixed in Cisco Unified Communications Manager versions 8.5(1), 8.0(3), 7.1(5)su1, and 6.1(5)su2.
- The second vulnerability could allow an unauthenticated, remote attacker to modify system configuration; create, modify, and delete users; or modify the configuration of Cisco Unified Communications Manager. This vulnerability is documented in Cisco Bug ID CSCtj42064 ( registered customers only) and has been assigned CVE identifier CVE-2011-1610. This vulnerability is fixed in Cisco Unified Communications Manager versions 8.5(1)su1, 8.0(3a)su2, 7.1(5)su4, and 6.1(5)su3.
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A workaround exists only for the SIP DoS vulnerabilities. Cisco Unified Communications 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. Customers who do not use SIP processing can use the following instructions to disable SIP processing:
- Step 1: Log into the Cisco Unified Communications Manager 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 the following location: 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 Unified Communications Manager" which is available at the following location:
https://sec.cloudapps.cisco.com/security/center/content/CiscoAppliedMitigationBulletin/cisco-amb-20110427-cucm
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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.
When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution. Cisco recommends upgrading to a release equal to or later than the release in the "Recommended Releases" column of the table.
Cisco Unified Communications Manager Version
Recommended Releases
6.x
6.1(5)SU3
7.x
7.1(5b)SU4
8.0
8.0(3a)SU2
8.5
8.5(1)SU1
Note: The 7.1(5b)SU4 release of Cisco Unified Communications Manager is expected to be available by the end of April 2011.
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The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.
The SQL injection vulnerabilities were reported to Cisco by TippingPoint's Zero Day Initiative and Cigital. They were discovered by Alberto Revelli of Cigital, Timothy Morgan of vSecurity, and Sven Taute.
The remainder of the vulnerabilities were found during internal testing and during the troubleshooting of customer service requests.
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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.
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Show LessRevision 1.0
2011-April-27
Initial public release.
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