Cisco Adaptive Security Appliance (ASA) devices configured for WebVPN contain a DOM-based cross-site scripting vulnerability (XSS) within the Portal Login page. An unauthenticated, remote attacker who can convince a user to take a malicious action, could perform a XSS attack on the user. The vulnerability exists due to mishandling of certain attributes that are processed within cookies passed as part of a request. A successful exploit may allow the attacker to execute arbitrary script or HTML code on the user's browser within the context of the affected site. Proof-of-concept code that exploits this vulnerability is publicly available. Cisco has confirmed the vulnerability and released updated software. To exploit the vulnerability, the attacker may provide a link to the user and may persuade the user to follow the link by using misleading language and instructions.
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-Dec-18 |
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