vBulletin User Profile Script Insertion Vulnerability

Secunia ID	SA36970
Release Date	09 Oct 2009
Criticality	Less Critical
Solution Status	Vendor Patch
Software	vBulletin 3.x
Where	From remote
Impact	Cross-Site Scripting Cross-Site Scripting vulnerabilities allow a third party to manipulate the content or behaviour of a web application in a user's browser, without compromising the underlying system. Different Cross-Site Scripting related vulnerabilities are also classified under this category, including "script insertion" and "cross-site request forgery". Cross-Site Scripting vulnerabilities are often used against specific users of a website to steal their credentials or to conduct spoofing attacks.
Description	A vulnerability has been reported in vBulletin, which can be exploited by malicious users to conduct script insertion attacks. Input passed via the "Home Page" field in the user profile section is not properly sanitised before being used. This can be exploited to insert arbitrary HTML and script code, which will be executed in a user's browser session in context of an affected site when the malicious data is viewed. The vulnerability is reported in version 3.8.4, 3.7.6, and 3.6.12. Other versions may also be affected.
Solution	Update to version 3.8.4 PL1, 3.7.6 PL1, or 3.6.12 PL2.
Reported by	MaXe
Original Advisory	vBulletin: http://www.vbulletin.com/forum/showthread.php?t=319572 MaXe: http://forum.intern0t.net/exploits-vulnerabilities-pocs/1502-vbulletin-3-8-4-cross-site-script-redirection.html