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Category:   Application (Forum/Board/Portal)  >   WoltLab Burning Board (wBB) Vendors:   Woltlab
Woltlab Burning Board Input Validation Hole in 'formmail.php' Permits Remote Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1012832
SecurityTracker URL:  http://securitytracker.com/id/1012832
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jan 11 2005
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Exploit Included:  Yes  
Version(s): 1.0.0, 1.0.1e; possibly others
Description:   An input validation vulnerability was reported in Woltlab Burning Board Lite in 'formmail.php'. A remote user can conduct cross-site scripting attacks.

Martin Heistermann reported that 'formmail.php' does not properly validate user-supplied input in the 'userid' parameter. A remote user can create a specially crafted URL that, when loaded by a target user, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the Woltlab Burning Board software 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 URL is provided:

http://website/board/formmail.php?userid=1">&lt;script&gt;document.location.href="http://www.it-security23.net";</script x="y

drhankey of it-security23.net is credited with discovering this flaw.

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the Woltlab Burning Board software, 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.woltlab.com/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.


 Source Message Contents

Subject:  Security Advisory: Woltlab Burning Board Lite formmail.php XSS




Advisory Information
--------------------
Advisory name		:  Woltlab Burning Board Lite formmail.php XSS
Discovered by		:  drhankey / it-security23.net
Vendor Name		:  Woltlab
Vendor Homepage		:  http://www.woltlab.de
Software		:  Woltlab Burning Board Lite
Vulnerability Type	:  Cross-Site-Scripting
Vulnerable Versions	:  1.0.0, 1.0.1e, maybe more
Platforms		:  OS Independent, PHP


What is Woltlab Burning Board Lite?
----------------------------------
Woltlab Burning Board Lite is the free version of the Woltlab Burning Board,
a PHP based bulletin board


Vulnerability Description:
-------------------------
formmail.php outputs the "userid"-parameter unfiltered, so its possible to add arbitary Code to the output by using a malformed link.
The Board also allows logging in with stolen cookies.

Proof of Concept:
-----------------
http://website/board/formmail.php?userid=1">&lt;script&gt;document.location.href="http://www.it-security23.net";</script x="y

 
 


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