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.







Cross Site Scripting:

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 a lot of times slashes will

be added to certain characters, or certain strings/characters disallowed,

but in vBulletin you can enter pretty much anything and have it execute

successfully. 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]<r=&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. 

http://www.gulftech.org