hfaxd in HylaFAX 4.2.3, when PAM support is disabled, accepts arbitrary passwords, which allows remote attackers to gain privileges.
http://www.vupen.com/english/advisories/2006/0072
http://www.securityfocus.com/bid/16150
http://www.securityfocus.com/archive/1/420974/100/0/threaded
http://www.mandriva.com/security/advisories?name=MDKSA-2006:015
http://www.hylafax.org/content/HylaFAX_4.2.4_release
http://www.hylafax.org/archive/2005-12/msg00119.php
http://www.gentoo.org/security/en/glsa/glsa-200601-03.xml
http://secunia.com/advisories/18489
http://secunia.com/advisories/18337