Attachment Mod 2.3.10 module for phpBB, when used with Apache mod_mime, does not properly handle files with multiple file extensions, such as .php.rar, which allows remote attackers to upload and execute arbitrary code.
https://exchange.xforce.ibmcloud.com/vulnerabilities/18438
http://www.securityfocus.com/bid/11893
http://www.opentools.de/board/viewtopic.php?t=3590