A vulnerability in the WebVPN functionality of Cisco Adaptive Security Appliance (ASA) could allow an authenticated, remote attacker to cause an affected device to crash. The vulnerability is due to a fault in the Proxy Bypass Content Rewriter implementation. An attacker could exploit this vulnerability by performing an HTTP request that triggers content rewriting. Depending on the configuration, a successful exploit could allow the attacker to cause the appliance to crash or trigger an error recovery event. Cisco has confirmed the vulnerability in a security notice and released software updates. To exploit this vulnerability, an attacker must authenticate to the targeted device. This access requirement reduces the likelihood of a successful exploit.
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 | 2015-Feb-06 |
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