The user.login function in Zabbix before 1.8.16 and 2.x before 2.0.5rc1 allows remote attackers to override LDAP configuration via the cnf parameter.
https://support.zabbix.com/browse/ZBX-6097
http://www.zabbix.com/rn2.0.5rc1.php
http://www.zabbix.com/rn1.8.16.php
http://www.securityfocus.com/bid/57471