WordPress Front End Upload v0.5.4.4 Arbitrary PHP File Upload

# Exploit Title: WordPress Front End Upload v0.5.4.4 Arbitrary PHP File Upload Vulnerability
# Date: 7/23/12
# Exploit Author: Chris Kellum
# Vendor Homepage: http://mondaybynoon.com/
# Software Link: http://downloads.wordpress.org/plugin/front-end-upload.0.5.4.4.zip
# Version: 0.5.4.4

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Vulnerability Details
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Plugin does not properly filter filetypes, which allows for the upload of filetypes in the following format:

     filename.php.jpg

Vulnerable hosts will serve such files as a php file, allowing for malicious files to be uploaded and executed.

In creating the uploads folder for this plugin, the code utilizes uniqid to add a unique string to the upload folder name in order to better hide it from direct access.

Example:

     /wp-content/uploads/feu_9fc12558ac71e6995808cfc590207e87/

However, many WordPress installations allow direct access to the /wp-content/uploads/ folder, so simply look for a folder name beginning with 'feu_' to locate your upload.

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Disclosure Timeline
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7/13/2012 - Vendor notified
7/23/2012 - Version 0.5.4.6 released
7/23/2012 - Public disclosure