Flash Tag Cloud Control Cross Site Scripting

`Hello Bugtraq!  
  
I want to warn you about security vulnerability in Flash Tag Cloud control  
for ASP.NET.  
  
-----------------------------  
Advisory: Vulnerability in widget Flash Tag Cloud for Blogsa and other  
ASP.NET engines  
-----------------------------  
URL: http://websecurity.com.ua/4213/  
-----------------------------  
Affected products: all versions of Flash Tag Cloud control for ASP.NET, all  
versions of Flash Tag Cloud for Blogsa and other ASP.NET engines.  
-----------------------------  
Timeline:  
  
10.05.2010 - found vulnerability.  
19.05.2010 - disclosed at my site.  
20.05.2010 - informed developers.  
-----------------------------  
Details:  
  
This is Cross-Site Scripting vulnerability. Which I found in Flash Tag Cloud  
control for ASP.NET (http://flashtagcloud.codeplex.com) on web sites with  
Blogsa engine, but any ASP-sites with Flash Tag Cloud control and other  
ASP.NET engines with this widget can be vulnerable.  
  
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/Widgets/FlashTagCloud/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/Widgets/FlashTagCloud/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  
`