Cisco Unified Communications Manager contains a vulnerability that could allow an authenticated, local attacker to elevate privileges on a targeted device. Updates are available.
A vulnerability in Cisco Unified Communications Manager (Unified CM) could allow an authenticated, local attacker to elevate privileges on the system.
The vulnerability is due to improper file permissions, environment variables, and relative paths in a privileged system script. An attacker could exploit this vulnerability by modifying a system script, which could allow the attacker to gain complete control of the affected system.
Proof-of-concept code that demonstrates an exploit of this vulnerability is publicly available.
Cisco has confirmed the vulnerability in a security advisory and has released a temporary fix.
Cisco Unified CM versions 9.1(1a) and prior are vulnerable.
To exploit this vulnerability, an attacker requires authenticated access to the targeted system. Authenticated access may require the attacker to access trusted, internal networks. These access requirements could limit the likelihood of a successful exploit.
Cisco Unified CM version 8.0 reached the End of Software Maintenance on October 23, 2012. Customers using Cisco Unified CM 8.0(x) versions should contact their Cisco support team for assistance in upgrading to a supported version of Cisco Unified CM.
Cisco UCM is the only product confirmed to be vulnerable. Additional voice products may be affected by one or more of the individual vulnerabilities that are described in the advisory. The following products are being investigated but have not yet been confirmed as vulnerable:
Cisco Emergency Responder
Cisco Unified Contact Center Express
Cisco Unified Customer Voice Portal
Cisco Unified Presence Server/Cisco IM and Presence Service
An authenticated, local attacker could exploit this vulnerability to completely compromise the targeted device.
The vulnerability is due to improper file permissions, environment variables, and relative paths in a privileged system script used by the affected software.
An authenticated, local attacker could exploit this vulnerability by modifying a privileged system script, which executes with elevated privileges, and inserting crafted commands. When the affected software executes the malicious commands, the attacker could completely compromise the targeted device.
Administrators are advised to apply the appropriate updates.
Administrators are advised to contact the vendor regarding future updates and releases.
Administrators are advised to allow only trusted users to have network access.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators are advised to monitor affected systems.
Cisco customers with active contracts can obtain updates through the Software Center. 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 email at email@example.com.
A Cisco Options Package (COP) file, cmterm-CSCuh01051-2.cop.sgn, has been released to the software downloads page in the Utilities section for the affected software. The COP file for 9.1(x) versions would be located by navigating the following path on the software downloads page:
The security vulnerability applies to the following combinations of products.
Cisco Unified Communications Manager
7.1 (3), (5), (5b)
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.