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Category:   Application (Forum/Board/Portal)  >   vBulletin Vendors:   Jelsoft Enterprises
vBulletin Forum Fails to Filter Scripting Code From Certain HTML Tags, Permitting Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1005803
SecurityTracker URL:  http://securitytracker.com/id/1005803
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Dec 13 2002
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information, User access via network
Exploit Included:  Yes  
Version(s): 2.2.7, 2.2.8
Description:   An input validation vulnerability was reported in vBulletin. A remote user can conduct cross-site scripting attacks against vBulletin users.

It is reported that vBulletin does not properly validate user-supplied input in forums that allow HTML tags. A remote user can, for example, insert scripting code into the HTML <B> bold tag.

A remote user can post a message containing specially crafted HTML so that, when the message is viewed by a target user, arbitrary scripting code will be executed by the target user's browser. The code will originate from the site running vBulletin and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

A demonstration exploit tag is provided:

<b onMouseOver="alert(document.location);">This piece of text could be dangerous if you were to move your mouse over it!</b>

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running vBulletin, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
Solution:   No solution was available at the time of this entry.
Vendor URL:  www.vbulletin.com/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.


 Source Message Contents

Subject:  Input Validation Error in vbulletin 2.2.x


Description:
---------------
VBulletin discussion forum (http://www.vbulletin.com) does not properly
validate the input for html tag enabled forums, allowing arbitrary
JavaScript code to be run for any access level user.

Prof of concept:
----------------
<b onMouseOver="alert(document.location);">This piece of text could be
dangerous if you were to move your mouse over it!</b>

In action here:
http://www.vbulletin.com/admindemo/showthread.php?threadid=3

Workaround:
-----------
Disable the ability to post messages containing HTML code

Vulnerable Versions:
--------------------
2.2.7
2.2.8

Not vulnerable:
---------------
?

Special thanks
--------------
To Pete Foster <pete@sec-tec.demon.co.uk> for finding the same problem
in phpBB which gave me idea to investigate.

---------------------------------
Dorin Balanica
dorin@bados.com
Security Officer,
bados.com

 
 


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