Summary: xoops 2.0.9.2 and below weak file extension validation
Description
===========
XOOPS is an extensible, OO (Object Oriented), easy to use dynamic web content management system written in PHP. XOOPS is the ideal tool for developing small to large dynamic community websites, intra company portals, corporate portals, weblogs and much more.
Details
=======
User may upload valid image file with insecure extension through avatar upload if "Allow custom avatar upload" is set to "Yes" in "User Info Settings". This setting is not on in default installation. This is cause of weak file extension validation XoopsMediaUploader class in file uploader.php.
if ( preg_match( '/\.(php|cgi|pl|py|asp)$/i', $this->mediaName ) ) {
$this->setErrors('Filename rejected');
return false;
}
In some web server installation other extension like .phtml,*.php3 is threat as php script.
Workaround ========== Set "Allow custom avatar upload" to "No" in "User Info Settings".
Proof of concept
================
Rename image to "image.php3" and upload as avatar using "Internet Explorer".
Vendor Response =============== 27th February 2005 - Vendor contacted but no response.
