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.
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.
| Version | Description | Section | Status | Date |
| 1.0 | Initial Release | NA | Final | 2014-Feb-21 |
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