AOL 9.0 Security Edition revision 4184.2340, and probably other versions, uses insecure permissions (Everyone/Full Control) for the "America Online 9.0" directory, which allows local users to gain privileges by replacing critical files.
https://exchange.xforce.ibmcloud.com/vulnerabilities/28445
http://www.vupen.com/english/advisories/2006/3317
http://www.securityfocus.com/bid/19583
http://www.securityfocus.com/archive/1/443622/100/0/threaded
http://securitytracker.com/id?1016717
http://securityreason.com/securityalert/1416