DokuWiki before 2014-05-05b, when using Active Directory for LDAP authentication, allows remote attackers to bypass authentication via a password starting with a null (\0) character and a valid user name, which triggers an unauthenticated bind.
https://github.com/splitbrain/dokuwiki/pull/868
http://www.openwall.com/lists/oss-security/2014/10/16/9
http://www.openwall.com/lists/oss-security/2014/10/13/3
http://www.debian.org/security/2014/dsa-3059