Hello Bugtraq! I want to warn you about security vulnerability in plugin tagcloud for Kasseler CMS ----------------------------- Advisory: Vulnerability in tagcloud for Kasseler CMS ----------------------------- URL: http://websecurity.com.ua/4191/ ----------------------------- Affected product: all versions of tagcloud for Kasseler CMS. ----------------------------- Timeline: 07.01.2010 - found vulnerability (during researches of vulnerabilities at gov-sites). 02.05.2010 - found that vulnerable site was using CMS (when visited it). 12.05.2010 - disclosed at my site. 13.05.2010 - informed developers. ----------------------------- Details: This is Cross-Site Scripting vulnerability. This XSS is similar to XSS vulnerability in WP-Cumulus and other web applications which I already reported to security mailing lists, because it's using tagcloud.swf made by author of WP-Cumulus. About millions of flash files tagcloud.swf which are vulnerable to XSS attacks I mentioned in my article XSS vulnerabilities in 34 millions flash files (http://www.webappsec.org/lists/websecurity/archive/2010-01/msg00035.html). XSS: http://site/includes/javascript/tagcloud/tagcloud.swf?mode=tags&tagcloud=%3Ctags%3E%3Ca+href='javascript:alert(document.cookie)'+style='font-size:+40pt'%3EClick%20me%3C/a%3E%3C/tags%3E Code will execute after click. It's strictly social XSS. Also it's possible to conduct (like in WP-Cumulus) HTML Injection attack, including in those flash files which have protection (in flash files or via WAF) against javascript and vbscript URI in parameter tagcloud. HTML Injection: http://site/includes/javascript/tagcloud/tagcloud.swf?mode=tags&tagcloud=%3Ctags%3E%3Ca+href='http://websecurity.com.ua'+style='font-size:+40pt'%3EClick%20me%3C/a%3E%3C/tags%3E Best wishes & regards, MustLive Administrator of Websecurity web site http://websecurity.com.ua