Directory traversal vulnerability in Edgewall Trac 0.8.3 and earlier allows remote attackers to read or write arbitrary files via a .. (dot dot) in the id parameter to the (1) upload or (2) attachment scripts.
http://www.hardened-php.net/advisory-012005.php
http://svn.edgewall.com/repos/trac/tags/trac-0.8.4/ChangeLog
http://secunia.com/advisories/15752
http://lists.grok.org.uk/pipermail/full-disclosure/2005-June/034618.html