Cisco Unified IP Phones 9900 Series contain a vulnerability that could allow a local attacker to execute commands. Updates are available.
A vulnerability in the image upgrade facility of Cisco Unified IP Phones 9900 Series could allow an authenticated, local attacker to execute commands within the context of the underlying operating system.
The vulnerability is due to insufficient sanitization of input during the image upgrade process. An attacker could exploit this vulnerability by inserting shell commands into a parameter using common techniques.
Cisco has confirmed the vulnerability in a security notice and released software updates.
At the time this alert was first published, Cisco Unified IP Phones 9900 Series Firmware versions 9.3.2 SR1 and prior were vulnerable. Later releases of Cisco Unified IP Phones 9900 Series Firmware may also be vulnerable.
To exploit this vulnerability, an attacker must be able to authenticate and have local access to a targeted device. These access requirements decrease the likelihood of a successful exploit.
Cisco indicates through the CVSS score that proof-of-concept exploit code exists; however, the code is not known to be publicly available.
Cisco has released a security notice at the following link: CVE-2013-5533
Customers are advised to consult Cisco bug ID CSCuh10334 for the most complete list of affected product versions.
A local attacker could exploit this vulnerability to execute arbitrary shell commands on the underlying operating system. A successful exploit could result in a complete system compromise.
The vulnerability is due to insufficient sanitization of user-supplied input during the image upgrade process.
A local attacker could exploit this vulnerability by inserting shell commands into a parameter using common techniques. If successful, the attacker could execute arbitrary shell commands on the underlying operating system, which could result in a complete system compromise.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to access local systems.
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 IP Phones 9900 Series Firmware
9.3 Base, .1, .2, .2 SR1
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.