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vbulletin.com Multiple XSS Vulnerabilities



Multiple XSS Vulnerabilities exist in vbulletin.com's website that allow the 
attacker to gain sensitive credentials for authentication himself as a user on 
the forum and site.

The first problem lies in the the site's Sales Form for opening an issue 
ticket.  Proper sanitation of variables passed via the "Full Name" field allows 
a user to inject:

<script src="evilxss.js></script>

The issue, being actually in something that looks like this:

http://www.vbulletin.com/issue.php?issueid=379455&authcode=e09e0afd

That link isn't a representation of this vuln, but moreless the output given 
after you submit an issue id and where the xss is viewable.

2.)  Another xss lies in the online Invoice Display.  If you go to pricing and 
ordering and then create a fake purchase, selecting Invoice as your chosen 
method of payment, it will give you an option to "view" your invoice online.  
All variables passed via input fields are NOT sanitized when displayed to 
screen via this method.  For example:

http://www.vbulletin.com/r.php?p=3E411875588B&a=f72c600cd7358bf596b4b1dea9ffb7ed&inv=1

That is a current invoice displaying an alert box with document.cookie.  If 
that link isnt available  at time of reading this, to recreate simply sign up 
to buy vbulletin and pay by invoice, your name is 
<script>alert(document.cookie);</script> - it will give you a link to view your 
invoice and there ya go ;)

This XSS allows for session theft on vbulletin.com's forums along with access 
to information ran under the context as a member on the website.


For a live demonstration that was anonymously submitted to me by an individual 
who confirmed this vulnerability and strictly for informational purposes only - 
where this was done in a testing environment - visit:

http://www.splices.org/ret/xssvid.html

Please enable sound.

Discovered by:  
splices
www.splices.org
www.securident.com