Cisco Unified Communications Manager contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
Description
Cisco Unified Communications Manager contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.
The vulnerability is due to errors in processing malformed Session Initiation Protocol (SIP) messages. An unauthenticated, remote attacker could exploit this vulnerability by sending malicious SIP messages to the vulnerable host. Successful exploitation could allow the attacker to trigger a DoS condition.
Cisco has confirmed this vulnerability in a security advisory and released software updates.
Warning Indicators
The following products are affected:
Cisco Unified Communications Manager versions prior to 5.1(3g)
Cisco Unified Communications Manager versions prior to 6.1(4)
Cisco Unified Communications Manager versions prior to 7.0(2a)su1
Cisco Unified Communications Manager versions prior to 7.1(2)
IntelliShield Analysis
Attackers may require access to internal, trusted network segments to accomplish an exploit of this vulnerability. Depending on site configuration, voice systems may be located on different physical or logical networks, limiting the potential for attack.
If an exploit is successful, an attacker could cause the Cisco Unified Communications Manager service to fail, preventing authorized users from accessing some voice services.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
An unauthenticated, remote attacker could exploit this vulnerability to cause the affected application to fail, resulting in a DoS condition.
Technical Information
The vulnerability is due to errors in processing malformed SIP messages. An unauthenticated, remote attacker could exploit this vulnerability by sending malicious SIP messages to the vulnerable system. When processed, the messages could trigger an error condition that could result in the failure and restart of the Cisco Unified Communications Manager service, causing a DoS condition.
Safeguards
Administrators are advised to apply the appropriate software updates.
Administrators are advised to restrict network access to affected systems.
Administrators may consider filtering SIP messages on TCP and UDP ports 5060 and TCP port 5061 from untrusted networks.
Administrators are advised to monitor critical systems.
The Cisco Applied Intelligence team has created the following companion document to guide administrators in identifying and mitigating attempts to exploit this vulnerability prior to applying updated software: cisco-amb-20090923-voice
Patches/Software
Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at tac@cisco.com.
The security vulnerability applies to the following combinations of products.
Primary Products:
Cisco
Cisco Unified Communications Manager
5.0(1) Base | 5.0(2) Base | 5.0(2a) Base | 5.0(3) Base | 5.0(3a) Base | 5.0(4) Base | 5.0(4a) Base | 5.0(4c) Base | 5.1 (1b), (1c), (2), (2a), (2b), (3), (3a) , (3b) , (3c) , (3d) , (3e) , Base | 5.1(1) Base | 5.1(1a) Base | 5.1(1b) Base | 5.1(1c) Base | 5.1(2) Base | 5.1(2a) Base | 5.1(2b) Base | 5.1(3) Base | 5.1(3a) Base | 5.1(3b) Base | 5.1(3c) Base | 6.0(1) Base | 6.0(1a) Base | 6.0(1b) Base | 6.1 (1), (1a), (1b), (2), (2)SU1, (2)SU1a, (3), Base | 6.1(1) Base | 6.1(1a) Base | 6.1(2) Base | 7.0 (1), (2), Base | 7.1 Base
Associated Products:
N/A
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