Unchecked error condition in LoginWindow in Apple Mac OS X 10.4 through 10.4.7 prevents Kerberos tickets from being destroyed if a user does not successfully log on to a network account from the login window, which might allow later users to gain access to the original user's Kerberos tickets.
http://www.vupen.com/english/advisories/2006/3852
http://www.securityfocus.com/bid/20271
http://securitytracker.com/id?1016959
http://secunia.com/advisories/22187
http://lists.apple.com/archives/security-announce/2006/Sep/msg00002.html