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Kunena Forum Extension for Joomla Multiple Reflected Cross-Site Scripting Vulnerabilities

Kunena forum extension for Joomla multiple reflected cross-site scripting vulnerabilities

Class:			Input Validation Error
Remote			Yes
Local			No
Published		02/07/2014

Credit			Raymond Rizk of Dionach (vulns@xxxxxxxxxxx)
Vendor			Kunena
Vulnerable		Kunena v3.0.5
Solution Status:	Fixed by Vendor

Kunena Forum is prone to multiple reflected cross-site scripting vulnerabilities because it fails to sufficiently sanitize user-supplied data.

An attacker may leverage these issues to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site, steal cookie-based authentication credentials, and obtain sensitive information.

Kunena v3.0.5 is known to be vulnerable. Earlier versions may also be vulnerable.

To exploit this issue, an attacker must have a user account on the forum. The vulnerability affects all pages/tasks that use parameters in the form of ?parameter[]?. Additionally, the file upload and profile image upload functionality are also vulnerable. This can be seen in the proof of concept example below:

POST /index.php?option=com_kunena&view=home&defaultmenu=130&Itemid=12
Content-Disposition: form-data; name="avatarfile"; filename="<iframe src=javascript:alert('XSS')>"

Vendor informed and a new version (3.0.6) was released on 28/07/2014. Vendor recommends updating Kunena to the latest version.