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.
For feedback or questions about this advisory mail us at sumofpwn at securify.nl
This issue has been found during the Summer of Pwnage hacker event, running from July 1-29. A community summer event in which a large group of security bughunters (worldwide) collaborate in a month of security research on Open Source Software (WordPress this time). For fun. The event is hosted by Securify in Amsterdam.
OVE-20160712-0015
Plugin Vulnerabilities - Reflected Cross-Site Scripting (XSS) Vulnerability in Quotes Collection
This issue was successfully tested on Quotes Collection WordPress Plugin version 2.0.5.
This issue is resolved in Quotes Collection version 2.0.6.
The Quotes Collection WordPress Plugin with Ajax powered Random Quote sidebar widget helps you collect and display your favourite quotes in your WordPress website. 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.
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.
<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>
