Cisco Unified IP Phones 9900 Series firmware contains a vulnerability that could allow an unauthenticated, remote attacker to access sensitive information. Updates are available.
A vulnerability in the Serviceability servlet of fourth-generation Cisco IP phones could allow an unauthenticated, remote attacker to download arbitrary files from the phone's file system.
The vulnerability is due to incomplete filtering of path values. An attacker could exploit this vulnerability by passing a valid path in a file request in the URL passed to the phone. An exploit could allow the attacker to retrieve an arbitrary file from the IP phone.
Cisco has confirmed this 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 versions of Cisco Unified IP Phones 9900 Series firmware may also be affected.
To exploit this vulnerability, an attacker may need access to trusted, internal networks to submit a request to a targeted device. This access requirement decreases the likelihood of a successful exploit.
Cisco has released a security notice at the following link: CVE-2013-3426
Customers should refer to Cisco bug ID CSCuh52810 for the most complete list of affected product versions.
An unauthenticated, remote attacker could exploit this vulnerability to download arbitrary files from a targeted device's file system and access sensitive information. Successful exploitation could be used to conduct further attacks.
The vulnerability is due to insufficient filtering of path values on Cisco 9900 Series phones running on affected versions of Cisco Unified IP Phones 9900 Series firmware.
An unauthenticated, remote attacker could exploit this vulnerability by passing a valid path in a file request in the URL passed to a targeted device. If successful, the attacker could retrieve arbitrary files from the targeted device, which could be used to conduct further attacks.
Administrators are advised to apply the appropriate updates.
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 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.