The Avatar upload feature in FUD Forum before 2.7.0 does not properly verify uploaded files, which allows remote attackers to execute arbitrary PHP code via a file with a .php extension that contains image data followed by PHP code.
fudforum.org/forum/index.php?t=msg&th=5470&start=0&
marc.info/?l=bugtraq&m=112534235403406&w=2
secunia.com/advisories/16627/
secunia.com/advisories/20203
www.debian.org/security/2006/dsa-1063
www.securityfocus.com/archive/1/500406/100/0/threaded
www.securityfocus.com/bid/14678
exchange.xforce.ibmcloud.com/vulnerabilities/22076