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.
It will be more appropriate to link to a page with a full detailed description of the above-mentioned security vulnerability in a AOL product: http://www.frsirt.com/english/advisories/2006/3317
