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Category:   Application (Forum/Board/Portal)  >   vBulletin Vendors:   Jelsoft Enterprises
vBulletin showthread, forumdisplay, and memberlist Input Validation Bugs Permit Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1009440
SecurityTracker URL:  http://securitytracker.com/id/1009440
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Mar 16 2004
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Exploit Included:  Yes  
Version(s): 3.0.0 RC4 and prior versions
Description:   Some input validation vulnerabilities were reported in vBulletin. A remote user can conduct cross-site scripting attacks.

JeiAr of the GulfTech Security Research Team reported that the 'showthread.php', 'forumdisplay.php', and 'memberlist.php' files do not properly filter HTML code from user-supplied input before displaying the input. 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 vBulletin 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.

Some demonstration exploit URLs are provided:

showthread.php?t=[VID]&page=[INT][XSS]
forumdisplay.php?f=[VID]&page=[INT]&sort=lastpost&order=[XSS]
memberlist.php?action=getall&what=[XSS]&ltr=&perpage=25&orderby=username

According to the report, the 'memberlist.php' bug seems to only affect versions prior to 3.0.0.

The vendor has reportedly been notified.

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the vBulletin 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.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:  http://www.gulftech.org/03152004b.php


http://www.gulftech.org/03152004b.php

JelSoft vBulletin Vulnerabilities  March 15, 2004


Vendor : Jelsoft Enterprises
URL : http://www.vbulletin.com
Version : vBulletin 3.0.0 RC4 && Others
Risk : Cross Site Scripting


Description:
vBulletin is a powerful, scalable and fully customisable forums package for your web site. 
Based on the PHP language, backed with a blisteringly fast MySQL back-end database, 
vBulletin is the ideal community solution for all medium-to-large sites.


Problem:
JelSoft vBulletin is prone to attack in three different files (maybe more) The files 
affected are "showthread.php", "forumdisplay.php", and also the "memberlist.php" file. The 
"memberlist.php" does not seem to be prone to the same attack I am about to talk about in 
versions three and later. The type of XSS that takes place though on vBulletin is what I 
would call a higher risk XSS issue. What I mean by that is alot of times slashes will be 
added to certain characters, or certain strings/characters disallowed, but in vBulletin 
you can eneter pretty much anything and have it execute sucessfully. This makes it a whole 
lot easier for an attacker to use these vulnerabilities to disclose a users information. 
Below are examples of the issues I have talked about here. Remember, the "memberlist.php" 
issue only seems to affect versions prior to 3.0, but the others affect all versions.


		
showthread.php?t=[VID]&page=[INT][XSS]
forumdisplay.php?f=[VID]&page=[INT]&sort=lastpost&order=[XSS]
memberlist.php?action=getall&what=[XSS]&ltr=&perpage=25&orderby=username




Solution:
JelSoft were notified and there will probably be a release of a patch or update to resolve 
these issues. Who knows, they might even charge you for the upgrade also :P heheh


Credits:
Credits go to JeiAr of the GulfTech Security Research Team.


 
 


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