CRLF injection vulnerability in Mantis 1.0.0rc3 and earlier allows remote attackers to modify HTTP headers and conduct HTTP response splitting attacks via (1) the return parameter in login_cookie_test.php and (2) ref parameter in login_select_proj_page.php.
http://www.vupen.com/english/advisories/2005/3064
http://www.securityfocus.com/bid/16046/
http://www.gentoo.org/security/en/glsa/glsa-200512-12.xml
http://www.debian.org/security/2005/dsa-944
http://sourceforge.net/project/shownotes.php?release_id=377934&group_id=14963
http://sourceforge.net/project/shownotes.php?release_id=377932&group_id=14963
http://secunia.com/advisories/18481