Cisco VPN Client on Windows before 5.0.01.0600, and the 5.0.01.0600 InstallShield (IS) release, uses weak permissions for cvpnd.exe (Modify granted to Interactive Users), which allows local users to gain privileges via a modified cvpnd.exe.
https://exchange.xforce.ibmcloud.com/vulnerabilities/36032
http://www.vupen.com/english/advisories/2007/2903
http://www.securityfocus.com/bid/25332
http://www.securityfocus.com/archive/1/476812/100/0/threaded
http://www.cisco.com/warp/public/707/cisco-sa-20070815-vpnclient.shtml
http://securitytracker.com/id?1018573