Cisco Security Advisory
Click Icon to Copy Verbose Score
AV:N/AC:M/Au:N/C:N/I:P/A:N/E:F/RL:U/RC:C
-
A vulnerability in the Phone Proxy function of the Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to modify the trust of the Certificate Trust List (CTL) of a remote IP phone.
The vulnerability is due to insufficient authentication of the CTL file. An attacker could exploit this vulnerability by injecting a modified CTL file to the phone proxy. An exploit could allow the attacker to impact the entities trusted by the IP phone.
Cisco has confirmed the vulnerability in a security notice; however, software updates are not available.
To exploit this vulnerability, an attacker may require access to trusted, internal networks to inject a modified CTL file to the phone proxy of an affected device. This access requirement decreases the likelihood 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.
-
Customers are advised to consult Cisco bug ID CSCuj66770 for a complete list of affected product versions.
-
Administrators are advised to contact the vendor regarding future updates and releases.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to monitor affected systems.
-
Software updates are not available.
-
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
-
To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
-
Show LessVersion Description Section Status Date 1.0 Initial Release NA Final 2014-Feb-21
-
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A stand-alone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy, and may lack important information or contain factual errors. The information in this document is intended for end-users of Cisco products.