A vulnerability in Certificate Trust List (CTL) authentication of Cisco third-generation IP phones could allow an unauthenticated, remote attacker to inject a crafted CTL file to the IP phone. The vulnerability is due to insufficient authentication of the CTL file. An attacker could exploit this vulnerability by injecting a crafted CTL file to the phone. An exploit could allow the attacker to cause the phone to trust systems under the attacker's control. 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 crafted CTL file to a targeted 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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