Cisco Unified Communications Manager contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition.? Updates are available.
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.
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)
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.
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.
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
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 firstname.lastname@example.org.
The security vulnerability applies to the following combinations of products.
Cisco Unified Communications Manager
5.1 (1b), (1c), (2), (2a), (2b), (3), (3a), (3b), (3c), (3d), (3e) | 6.1 (1), (1a), (1b), (2), (2)SU1, (2)SU1a, (3) | 7.0 Base, (1), (2) | 7.1 Base | 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 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 Base | 6.1(1) Base | 6.1(1a) Base | 6.1(2) Base
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.