The default configuration of Pandora FMS 3.1 and earlier specifies an empty string for the loginhash_pwd field, which allows remote attackers to bypass authentication by sending a request to index.php with "admin" in the loginhash_user parameter, in conjunction with the md5 hash of "admin" in the loginhash_data parameter.
https://www.exploit-db.com/exploits/35731/
http://www.securityfocus.com/archive/1/514939/100/0/threaded
http://secunia.com/advisories/42347
http://seclists.org/fulldisclosure/2010/Nov/326
http://packetstormsecurity.com/files/129830/Pandora-3.1-Auth-Bypass-Arbitrary-File-Upload.html