[|Description:|] A security bug has been discovered in MetaForum 0.513 Beta. This bug can be used by an attacker to upload a malicious php file on the server. During the upload, the MIME type of the file is the only verified parameter. The extention isn't. This enables a attacker to fake the MIME type of a php file so that it is considered as an image. [|Exploit:|] http://www.aeroxteam.fr/exploit-MetaForum-0.513b.txt [|Solution:|] Replace line 110 in the file usercp.php by: if (($_FILES['imagefile']['type'] == "image/jpeg" || $_FILES['imagefile']['type'] == "image/pjpeg" || $_FILES['imagefile']['type'] == "image/png" || $_FILES['imagefile']['type'] == "image/gif") && in_array(strtolower(substr(strrchr($_FILES['imagefile']['name'], '.'),1)), array('gif', 'jpg', 'jpeg', 'png'))) [|Credits:|] Gu1ll4um3r0m41n (aeroxteam --[at]-- gmail --[dot]-- com) for AeroX & NeoAlpha (AeroXteam.fr -- Neoalpha.fr) [|Gr33tz:|] Math², Syntax ERROR, Barma, NeoMorphS, Snake91, Spamm, Kad, Nitr0, Jethro And everybody from #aerox