Cisco Security Advisory
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AV:N/AC:L/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:C
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Cisco Unified Communications Manager, formerly Cisco CallManager, contains multiple denial of service (DoS) vulnerabilities that may cause an interruption in voice services, if exploited. These vulnerabilities were discovered internally by Cisco. The following Cisco Unified Communications Manager services are affected:
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Certificate Trust List (CTL) Provider
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Certificate Authority Proxy Function (CAPF)
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Session Initiation Protocol (SIP)
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Simple Network Management Protocol (SNMP) Trap
Cisco has released software updates that address these vulnerabilities. Workarounds that mitigate some of these vulnerabilities are available.
This advisory is posted at https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20080514-cucmdos.
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Certificate Trust List (CTL) Provider
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Vulnerable Products
These products are vulnerable:
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Cisco Unified CallManager 4.1 versions prior to 4.1.3SR7
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Cisco Unified Communications Manager 4.2 versions prior to
4.2(3)SR4
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Cisco Unified Communications Manager 4.3 versions prior to
4.3(2)
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Cisco Unified Communications Manager 5.x versions prior to
5.1(3)
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Cisco Unified Communications Manager 6.x versions prior to
6.1(1)
Administrators of systems running Cisco Unified Communications Manager version 4.x can determine the software version by navigating to Help > About Cisco Unified CallManager and selecting the Details button via the Cisco Unified Communications Manager Administration interface.
Administrators of systems that are running Cisco Unified Communications Manager versions 5.x and 6.x can determine the software version by viewing the main page of the Cisco Unified Communications Manager Administration interface. The software version can also be determined by running the command show version active via the command line interface (CLI).
Products Confirmed Not Vulnerable
Cisco Unified Communications Manager Express 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 CallManager 4.1 versions prior to 4.1.3SR7
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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, voice-over-IP (VoIP) gateways, and multimedia applications.
Certificate Trust List Provider Related Vulnerabilities
The Certificate Trust List (CTL) Provider service of Cisco Unified Communications Manager version 5.x contains a memory consumption vulnerability that occurs when a series of malformed TCP packets are received by a vulnerable Cisco Unified Communications Manager system and may result in a DoS condition. The CTL Provider service listens by default on TCP port 2444 and is user configurable. The CTL Provider service is enabled by default. There is a workaround for this vulnerability. The vulnerability is fixed in Cisco Unified Communications Manager version 5.1(3). The vulnerability is documented in Cisco Bug ID CSCsj80609 ( registered customers only) and has been assigned the CVE identifier CVE-2008-1742.
The CTL Provider service of Cisco Unified Communications Manager versions 5.x and 6.x contain a memory consumption vulnerability that occurs when a series of malformed TCP packets are received by a vulnerable Cisco Unified Communications Manager system and may result in a DoS condition. The CTL Provider service listens by default on TCP port 2444 and is user configurable. There is a workaround for this vulnerability. The vulnerability is fixed in Cisco Unified Communications Manager versions 5.1(3) and 6.1(1). This vulnerability is documented in Cisco Bug ID CSCsi98433 ( registered customers only) and has been assigned the CVE identifier CVE-2008-1743.
Certificate Authority Proxy Function Related Vulnerability
The Certificate Authority Proxy Function (CAPF) service of Cisco Unified Communications Manager versions 4.1, 4.2 and 4.3 contain a vulnerability when handling malformed input that may result in a DoS condition. The CAPF service listens by default on TCP port 3804 and is user configurable. The CAPF service is disabled by default. There is a workaround for this vulnerability. This vulnerability is fixed in Cisco Unified Communications Manager versions 4.1(3)SR7, 4.2(3)SR4 and 4.3(2). This vulnerability is documented in Cisco Bug ID CSCsk46770 ( registered customers only) and has been assigned the CVE identifier CVE-2008-1744.
SIP-Related Vulnerabilities
Cisco Unified Communications Manager versions 5.x and 6.x contain a vulnerability in the handling of malformed SIP JOIN messages that may result in a DoS condition. SIP processing cannot be disabled in Cisco Unified Communications Manager. There is no workaround for this vulnerability. This vulnerability is fixed in Cisco Unified Communications Manager versions 5.1(2) and 6.1(1). This vulnerability is documented in Cisco Bug ID CSCsi48115 ( registered customers only) and has been assigned the CVE identifier CVE-2008-1745.
Cisco Unified Communications Manager versions 4.1, 4.2, 4.3, 5.x and 6.x contain a vulnerability in the handling of SIP INVITE messages that may result in a DoS condition. SIP processing cannot be disabled in Cisco Unified Communications Manager. There is no workaround for this vulnerability. Cisco Unified Communications Manager version 4.x systems not configured to use SIP are not vulnerable. The vulnerability is fixed in Cisco Unified Communications Manager versions 4.1(3)SR6, 4.2(3)SR3, 4.3(2), 5.1(3) and 6.1(1). This vulnerability is documented in Cisco Bug ID CSCsk46944 ( registered customers only) and has been assigned the CVE identifier CVE-2008-1747.
Cisco Unified Communications Manager versions 4.1, 4.2, 4.3, 5.x and 6.x contain a vulnerability in the handling of SIP INVITE messages that may result in a DoS condition. SIP processing cannot be disabled in Cisco Unified Communications Manager. There is no workaround for this vulnerability. Cisco Unified Communications Manager version 4.x systems not configured to use SIP are not vulnerable. This vulnerability is fixed in Cisco Unified Communications Manager versions 4.1(3)SR7, 4.2(3)SR4, 4.3(2), 5.1(3) and 6.1(1). This vulnerability is documented in Cisco Bug ID CSCsl22355 ( registered customers only) and has been assigned the CVE identifier CVE-2008-1748.
SNMP Trap-Related Vulnerability
The SNMP Trap Agent service of Cisco Unified Communications Manager versions 4.1, 4.2, 4.3, 5.x and 6.x contain a vulnerability that occurs when a series of malformed UDP packets are received by a vulnerable Cisco Unified Communications Manager system and may result in a DoS condition. The SNMP Trap Agent service listens by default on UDP port 61441. There is a workaround for this vulnerability. This vulnerability is fixed in Cisco Unified Communications Manager versions 4.1(3)SR6, 4.2(3)SR3, 4.3(2), 5.1(3) and 6.1(1). This vulnerability is documented in Cisco Bug ID CSCsj24113 ( registered customers only) and has been assigned the CVE identifier CVE-2008-1746.
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CTL Provider Related Vulnerabilities
To mitigate against the CTL Provider service vulnerabilities (CSCsj80609 and CSCsi98433), system administrators can disable the CTL Provider service if it is not needed. Access to the CTL Provider Service is usually only required during the initial configuration of Cisco Unified Communications Manager authentication and encryption features. The CTL Provider service is controlled via the Cisco CTL Provider menu selection.
It is possible to mitigate the CTL Provider vulnerabilities by implementing filtering on screening devices. If the CTL Provider service is enabled, permit access to TCP port 2444 only between the Cisco Unified Communications Manager systems where the CTL Provider service is active and the CTL Client, usually on the administrator's workstation, to mitigate the CTL Provider service overflow.
Note: It is possible to change the default port of the CTL Provider service (TCP port 2444). If changed, filtering should be based on the values used. The values of the ports can be viewed in Cisco Unified Communications Manager Administration interface by following the System > Service Parameters menu and selecting the appropriate service.
CAPF Related Vulnerability
To mitigate against the CAPF service vulnerability (CSCsk46770), system administrators can disable the CAPF service if it is not needed. Access to the CAPF service is only required if Cisco Unified Communications Manager systems and IP phone devices are configured to use certificates for a secure deployment. If phones are not configured to use certificates, then the CAPF service can be disabled. The CAPF service is controlled by the Cisco Certificate Authority Proxy Function menu selection.
It is possible to mitigate the CAPF vulnerability by implementing filtering on screening devices. If the CAPF service is enabled, permit access to TCP port 3804 only from networks that contain IP phone devices needing to utilize the CAPF service.
SIP-Related Vulnerabilities
It is possible to mitigate the SIP vulnerabilities by implementing filtering on screening devices. Permit TCP/UDP access to ports 5060 and 5061 from only networks that need SIP access to Cisco Unified Communications Manager servers.
SNMP Trap-Related Vulnerability
To mitigate against the SNMP Trap service vulnerability (CSCsj24113), system administrators can disable the SNMP Trap service. For Cisco Unified Communications Manager 4.x systems, the SNMP Trap service is controlled by the embedded Windows SNMP sevice. To disable the Windows SNMP service, navigate to Start > Programs > Administrative Tools > Services, and stop the SNMP Service.
Note: The SNMP Trap Service listed in the Windows Service configuration screen is not applicable to this vulnerability and disabling it does not provide any benefit as a workaround for this vulnerability. For Cisco Unified Communications Manager 5.x and 6.x systems, the SNMP Trap service is controlled via the Cisco CallManager SNMP Service selection on the Control Center Feature Services screen.
It is possible to mitigate the SNMP Trap service vulnerability by implementing filtering on screening devices. Permit access to UDP port 61441 only from management systems that need access to the SNMP Trap service.
For Cisco Unified Communications Manager 4.x systems, please consult the following documentation for details on how to disable Cisco Unified Communications Manager services:
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/service/4_2_3/ccmsrva/sasrvact.html
For Cisco Unified Communications Manager 5.x and 6.x systems, please consult the following documentation for details on how to disable Cisco Unified Communications Manager services:
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/service/5_0_1/ccmsrva/sasrvact.html#wp1048220
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:
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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.
Cisco Unified CallManager version 4.1(3)SR7 contains fixes for all vulnerabilities affecting Cisco Unified CallManager version 4.1 listed in this advisory. It can downloaded at the following link:
http://www.cisco.com/pcgi-bin/tablebuild.pl/callmgr-41?psrtdcat20e2
Cisco Unified Communications Manager version 4.2(3)SR4 contains fixes for all vulnerabilities affecting Cisco Unified Communications Manager version 4.2 listed in this advisory and is scheduled to be released in early June, 2008. It will be available for download at the following link:
http://www.cisco.com/pcgi-bin/tablebuild.pl/callmgr-42?psrtdcat20e2
Cisco Unified Communications Manager version 4.3(2) contains fixes for all vulnerabilities affecting Cisco Unified Communications Manager version 4.2 listed in this advisory. It can downloaded at the following link:
http://www.cisco.com/pcgi-bin/tablebuild.pl/callmgr-43?psrtdcat20e2
Cisco Unified Communications Manager version 5.1(3) contains fixes for all vulnerabilities affecting Cisco Unified Communications Manager version 5.x listed in this advisory. It can downloaded at the following link:
http://www.cisco.com/pcgi-bin/tablebuild.pl/callmgr-51?psrtdcat20e2
Cisco Unified Communications Manager version 6.1(1) contains fixes for all vulnerabilities affecting Cisco Unified Communications Manager version 6.x listed in this advisory. It can downloaded at the following link:
http://www.cisco.com/pcgi-bin/tablebuild.pl/callmgr-61?psrtdcat20e2
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The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities described in this advisory.
These vulnerabilities were discovered internally by Cisco.
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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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Revision 1.0
2008-May-14
Initial public release
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