procmail in Ingo H3 before 1.1.2 Horde module allows remote authenticated users to execute arbitrary commands via shell metacharacters in the mailbox destination of a filter rule.
bugs.horde.org/ticket/?Horde=6ed1a009f3396864553976a45948339e&id=4513
lists.horde.org/archives/announce/2006/000296.html
secunia.com/advisories/22482
secunia.com/advisories/22656
secunia.com/advisories/23100
www.debian.org/security/2006/dsa-1204
www.gentoo.org/security/en/glsa/glsa-200611-22.xml
www.securityfocus.com/bid/20637
www.vupen.com/english/advisories/2006/4124