XSS vulnerability in CMSimple

Type securityvulns
Reporter Securityvulns
Modified 2010-08-17T00:00:00


Vulnerability ID: HTB22559 Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_cmsimple_1.html Product: CMSimple Vendor: Peter Andreas Harteg ( http://www.cmsimple.org/ ) Vulnerable Version: 3.3 and Probably Prior Versions Vendor Notification: 02 August 2010 Vulnerability Type: XSS (Cross Site Scripting) Status: Not Fixed, Vendor Alerted, Awaiting Vendor Response Risk level: Medium Credit: High-Tech Bridge SA - Ethical Hacking & Penetration Testing (http://www.htbridge.ch/)

Vulnerability Details: User can execute arbitrary JavaScript code within the vulnerable application.

The vulnerability exists due to failure in the "/cmsimple/adm.php" script to properly sanitize user-supplied input in "text" variable. Successful exploitation of this vulnerability could result in a compromise of the application, theft of cookie-based authentication credentials, disclosure or modification of sensitive data.

An attacker can use browser to exploit this vulnerability. The following PoC is available:

<form action="http://host/" method="post" name="main" >

<input type="hidden" name="text" value='php and html code of template<script>alert(document.cookie)</script>' /> <input type="hidden" name="file" value="template" /> <input type="hidden" name="action" value="save" />

</form> <script> document.main.submit(); </script>