The TCLHTTPd service in Lyris ListManager before 8.9b allows remote attackers to obtain source code for arbitrary .tml (TCL) files via (1) a request with a trailing null byte (%00), which might also require (2) an authentication bypass step that involves a username with a trailing "@" characters.
http://www.vupen.com/english/advisories/2005/2820
http://www.securityfocus.com/bid/15788
http://www.securityfocus.com/archive/1/419077/100/0/threaded
http://archives.neohapsis.com/archives/fulldisclosure/2005-12/0349.html