Buffer overflow in Anon Proxy Server 0.102 and earlier, when user authentication is enabled, allows remote attackers to cause a denial of service (exception) via a user name with a large number of quotes, which triggers the overflow during escaping.
https://sourceforge.net/project/shownotes.php?group_id=138780&release_id=571924
http://www.securityfocus.com/bid/27593
http://www.securityfocus.com/archive/1/487446/100/0/threaded