Cisco Network Admission Control (NAC) Appliance 3.5.x, 3.6.x before 3.6.4.4, 4.0.x before 4.0.6, and 4.1.x before 4.1.2 allows remote attackers to obtain the shared secret for the Clean Access Server (CAS) and Clean Access Manager (CAM) by sniffing error logs.
https://exchange.xforce.ibmcloud.com/vulnerabilities/41849
http://www.vupen.com/english/advisories/2008/1248/references
http://www.securitytracker.com/id?1019859
http://www.securityfocus.com/bid/28807
http://www.cisco.com/en/US/products/products_security_advisory09186a008097bea0.shtml