Best Practical Solutions RT 3.x before 3.8.9rc2 and 4.x before 4.0.0rc4 uses the MD5 algorithm for password hashes, which makes it easier for context-dependent attackers to determine cleartext passwords via a brute-force attack on the database.
https://bugzilla.redhat.com/show_bug.cgi?id=672250
http://www.vupen.com/english/advisories/2011/0576
http://www.vupen.com/english/advisories/2011/0475
http://www.vupen.com/english/advisories/2011/0190
http://www.securityfocus.com/bid/45959
http://www.debian.org/security/2011/dsa-2150
http://secunia.com/advisories/43438
http://lists.fedoraproject.org/pipermail/package-announce/2011-March/054740.html
http://lists.bestpractical.com/pipermail/rt-announce/2011-January/000185.html