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WordPress Email Users 4.8.2 Cross Site Scripting

WordPress Email Users 4.8.2 Cross Site Scripting
Posted Jul 12, 2016
Authored by Yorick Koster, Securify B.V.

WordPress Email Users plugin version 4.8.2 suffers from a cross site scripting vulnerability.

tags | exploit, xss
MD5 | 3023cf48133ae94c6b7deb2665edda0a

WordPress Email Users 4.8.2 Cross Site Scripting

Change Mirror Download
------------------------------------------------------------------------
Cross-Site Scripting vulnerability in Email Users WordPress Plugin
------------------------------------------------------------------------
Yorick Koster, July 2016

------------------------------------------------------------------------
Abstract
------------------------------------------------------------------------
A Cross-Site Scripting vulnerability was found in the Email Users
WordPress 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.

------------------------------------------------------------------------
OVE ID
------------------------------------------------------------------------
OVE-20160712-0012

------------------------------------------------------------------------
Tested versions
------------------------------------------------------------------------
This issue was successfully tested on Email Users WordPress Plugin
version 4.8.2.

------------------------------------------------------------------------
Fix
------------------------------------------------------------------------
This issue is resolved in Email Users version 4.8.3.

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

The issue exists in the file email_users_user_settings.php and is caused by the lack of output encoding on the page request parameter. The vulnerable code is listed below.

<form id="email-users-filter" method="get">
<!-- For plugins, we also need to ensure that the form posts back to our current page -->
<input type="hidden" name="page" value="<?php echo $_REQUEST['page'] ?>" />
<!-- Now we can render the completed list table -->
<?php $mailusersListTable->search_box(__('Search', MAILUSERS_I18N_DOMAIN), 'search_id'); ?>
<?php $mailusersListTable->display() ; ?>
</form>

Normally, the page URL parameter is validated by WordPress, which prevents Cross-Site Scripting. However in this case the value of page is obtained from $_REQUEST, not from $_GET. This allows for parameter pollution where the attacker puts a benign page value in the URL and simultaneously submits a malicious page value as POST parameter.
Proof of concept

<html>
<body>
<form action="http://<target>/wp-admin/admin.php?page=mailusers-user-settings" method="POST">
<input type="hidden" name="page" value=""<script>alert(document.cookie);</script>" />
<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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