SQL injection vulnerability in the create_session function in class_session.php in MyBB (aka MyBulletinBoard) 1.2.3 and earlier allows remote attackers to execute arbitrary SQL commands via the Client-IP HTTP header, as utilized by index.php, a related issue to CVE-2006-3775.
https://www.exploit-db.com/exploits/3653
http://www.vupen.com/english/advisories/2007/1244
http://www.securityfocus.com/archive/1/464563/100/0/threaded
http://secunia.com/advisories/24689