The (1) Zend_Ldap class in Zend before 1.12.9 and (2) Zend\Ldap component in Zend 2.x before 2.2.8 and 2.3.x before 2.3.3 allows remote attackers to bypass authentication via a password starting with a null byte, which triggers an unauthenticated bind.
https://exchange.xforce.ibmcloud.com/vulnerabilities/97038
http://www.securityfocus.com/bid/70378
http://www.oracle.com/technetwork/topics/security/bulletinjan2015-2370101.html
http://www.openwall.com/lists/oss-security/2014/10/10/5
http://www.debian.org/security/2015/dsa-3265
http://lists.fedoraproject.org/pipermail/package-announce/2014-October/141106.html
http://lists.fedoraproject.org/pipermail/package-announce/2014-October/141070.html