jQuery Uploadify 2.1.0 – Arbitrary File Upload
# Exploit Title: jQuery uploadify v2.1.0 Remote File Upload # Date: 21/01/2010 # Author: k4cp3r/Ablus # Version: v2.1.0 (uploadify.swf) Actionscript: function setAllowedTypes():void { allowedTypes = []; if (param.fileDesc && param.fileExt) { var fileDescs:Array = param.fileDesc.split('|'); var fileExts:Array = param.fileExt.split('|'); for (var n = 0; n < fileDescs.length; n++) { allowedTypes.push(new FileFilter(fileDescs[n], fileExts[n])); } } } setAllowedTypes(); The FileFilter class is used to indicate what files on the user's system are shown in the file-browsing dialog box that is displayed when the FileReference.browse() method; a user can simply bypass this filter by writing the malicious file name and path on the file browser dialog box rather than navigating and choosing it. Exploit: #1 : upload your file ie (shell.php) #2 : Retreive the 'folder' parameter passed to uploadify jquery function from the head of the page source code ie('folder': 'files/',) #3 : Navigate to your file ie(http://site/files/shell.php) Fix: A quick fix is to validate your file type inside uploadify.php before saving it OR to randomize your file names :) Greetz to all Al Akhawayn friends |