lib/WikiUser/LDAP.php in PhpWiki before 1.3.13p1, when the configuration lacks a nonzero PASSWORD_LENGTH_MINIMUM, might allow remote attackers to bypass authentication via an empty password, which causes ldap_bind to return true when used with certain LDAP implementations.
https://exchange.xforce.ibmcloud.com/vulnerabilities/34819
http://www.vupen.com/english/advisories/2007/2144
http://www.debian.org/security/2007/dsa-1371
http://sourceforge.net/tracker/index.php?func=detail&aid=1732882&group_id=6121&atid=106121
http://sourceforge.net/project/shownotes.php?release_id=514820
http://security.gentoo.org/glsa/glsa-200709-10.xml
http://secunia.com/advisories/26880
http://secunia.com/advisories/26784