Details ======= Product: eXV2.de CMS <= 2.0.5. Severity: moderated Remote-Exploit: yes Vendor-URL: http://www.exv2.de/ Vendor-Status: informed Advisory-Status: published Credits ============ Discovered by: Vision aka n-tier http://www.i-s-o.org Original Advisory: ============ http://www.i-s-o.org/security.txt Introduction ============ eXV2.de CMS is a Content Management System. More Details ============ 1. Cross Site Scripting: Input passed directly to the "set_lang" parameter in the Browser Cookie is not properly sanitised before being returned to the user. A user can sent a cookie to himself with ?/set_lang=deutsch and edit it. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site. Workaround: [Cross Site Scripting] ============= Edit the source code to ensure that input is properly sanitised. Example: $my_Cookie_Vars = $_COOKIE; if (isset($my_Cookie_Vars['set_lang'])){ if (($my_Cookie_Vars['set_lang'] == "deutsch")||($my_Cookie_Vars['set_lang'] == "english")||($my_Cookie_Vars['set_lang'] == "french")) { } else { $abuse = true; $xoopsConfig['language'] = $xoopsConfig['default_language']; } } if ($abuse){ die("The desired action could not be performed."); } History/Timeline ================ 7.08.2007 discovery of the vulnerabilities 8.08.2007 additional tests with other versions 10.08.2007 contacted the vendor