pam_ldap in nss_ldap on Red Hat Enterprise Linux 4, Fedora Core 3 and earlier, and possibly other distributions does not return an error condition when an LDAP directory server responds with a PasswordPolicyResponse control response, which causes the pam_authenticate function to return a success code even if authentication has failed, as originally reported for xscreensaver.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10418
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=207286
http://www.vupen.com/english/advisories/2006/4319
http://www.securityfocus.com/bid/20880
http://www.securityfocus.com/archive/1/447859/100/200/threaded
http://www.mandriva.com/security/advisories?name=MDKSA-2006:201
http://www.debian.org/security/2006/dsa-1203
http://securitytracker.com/id?1017153
http://security.gentoo.org/glsa/glsa-200612-19.xml
http://secunia.com/advisories/23428
http://secunia.com/advisories/23132
http://secunia.com/advisories/22869
http://secunia.com/advisories/22696
http://secunia.com/advisories/22694
http://secunia.com/advisories/22685