Exponent Slideshow XSS Vulnerability

[Andrei Rimsa <rimsa@xxxxxxxx>]

Title: Exponent Slideshow XSS Vulnerability
Vendor: Exponent
Product: Exponent CMS
Tested Version: 0.97.0
Threat Class: XSS
Severity: High
Remote: yes
Local: no
Discovered By: Andrei Rimsa Alvares

===== Description =====

The file "modules/slideshowmodule/slideshow.js.php" is prone to XSS 
vulnerabilities. Multiple instance of variable $_GET['u'] gets outputted to the 
page without proper sanitization.

===== Impact =====

Malicious java script code can be executed in the context of the affected web 
site.

===== Proof of Concept =====

http://target/modules/slideshowmodule/slideshow.js.php?u=%3Cscript%3Ewindow.alert(String.fromCharCode(88,83,83));%3C/script%3E

===== Workaround =====

No workaround is available at the time.

===== Disclosure Timeline =====

June, 16 2010 - Vendor notification.
July, 07 2010 - No vendor reply. Public disclosure.

===== References =====

http://www.exponentcms.org                                        
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