Direct static code injection vulnerability in func.inc.php in ZoneO-Soft freeForum before 1.2.1 allows remote attackers to execute arbitrary PHP code via the (1) X-Forwarded-For and (2) Client-Ip HTTP headers, which are stored in Data/flood.db.php.
http://www.vupen.com/english/advisories/2006/0759
http://www.securityfocus.com/bid/16871
http://www.securityfocus.com/archive/1/427321/100/0/threaded
http://soft.zoneo.net/freeForum/changes.php