Cisco Security Advisory
Cisco Third-Generation IP Phone CTL Trust Chain Enforcement Vulnerability
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AV:N/AC:M/Au:N/C:N/I:P/A:N/E:F/RL:U/RC:C
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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.
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Customers are advised to consult Cisco bug ID CSCuj66795 for a complete list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco Unified IP Phone 7960G Series versions 9.2(1) and prior were vulnerable. Later releases of Cisco Unified IP Phone 7960G Series may also be vulnerable.Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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Administrators are advised to contact the vendor regarding future updates and releases.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to monitor affected systems.
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Software updates are not available.
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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.
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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.
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Show LessVersion Description Section Status Date 1.0 Initial Release NA Final 2014-Feb-21
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