Description
Cisco Secure Access Control Server for Windows (ACS Windows) and Cisco Secure Access Control Server Solution Engine (ACS Solution Engine) 3.3.1, when the EAP-TLS protocol is enabled, does not properly handle expired or untrusted certificates, which allows remote attackers to bypass authentication and gain unauthorized access via a "cryptographically correct" certificate with valid fields such as the username.
References
- 20041102 Vulnerability in Cisco Secure Access Control Server EAP-TLS Authentication vendor-advisory
- ciscosecure-eaptls-auth-bypass(17936) vdb-entry
- 11577 vdb-entry
- P-028 third-party-advisory government-resource