A vulnerability in the Smart Call Home (SCH) feature of Cisco ASA Software could allow an unauthenticated, remote attacker to bypass digital certificate validation if any feature that uses digital certificates is configured on the affected system. The vulnerability exists because when SCH is configured, a trustpoint, including a VeriSign certificate, is automatically installed. An attacker could exploit this vulnerability by presenting a valid certificate signed by VeriSign when authenticating to the affected system. An exploit could allow the attacker, for example, to bypass digital certificate authentication when used by a given feature. Examples of features that could be configured to use digital certificates validation include VPN and Adaptive Security Device Management (ASDM) authentication, TLS Proxy, and Phone Proxy. Cisco has confirmed the vulnerability in a security advisory and released software updates. To exploit this vulnerability, an attacker may need to obtain additional information about the targeted device, such as whether the SCH feature is configured or has been configured on the system. However, this vulnerability still cannot be exploited unless there is another feature configured that relies on digital certificate validation services. 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-Oct-08 |
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