Cisco Unified Communications Manager contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
A vulnerability in Cisco Unified Communications Manager (Unified CM) could allow an unauthenticated, remote attacker to create a denial of service (DoS) condition.
The vulnerability is due to improper parsing of a SIP message. An attacker could exploit this vulnerability by sending a specific SIP message to the affected Unified CM. An exploit could allow the attacker to cause a DoS condition, resulting in a coredump and restart of the service.
Cisco has confirmed the vulnerability in a security notice and released software updates.
At the time this alert was first published, Cisco Unified CM versions 8.6.2 and prior were vulnerable. Later releases of Cisco Unified CM may also be vulnerable.
To exploit this vulnerability, an attacker must be able to send a specific SIP message to the targeted device which may reside on trusted, internal networks behind firewall restrictions. The location of the targeted device could likely reduce the possibility of a successful exploit.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
Cisco has released a security notice at the following link: CVE-2013-5555
Customers are advised to consult Cisco bug ID CSCub54349 or the most complete list of affected product versions.
An unauthenticated, remote attacker could exploit this vulnerability to cause an affected device to reload, resulting in a DoS condition.
The vulnerability is due to improper parsing of a SIP message by an affected device.
An unauthenticated, remote attacker could exploit this vulnerability by sending a specific SIP message to the affected Unified CM. An exploit could allow the attacker to cause a DoS condition.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to monitor affected systems.
Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at firstname.lastname@example.org for assistance.
The security vulnerability applies to the following combinations of products.
Cisco Unified Communications Manager
8.6 Base, .1, .2
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.