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1. DESCRIPTION OF THE SOFTWARE
On May 6th, 2007 a new WordPress plugin called "stats" was released.
This plugin allows a WordPress user who has his blog self-hosted to
use the Wordpress.com statistics.
statistics from visitors. This statistics include page viewed, search
engine keywords, if used, and referrer as well.
2. DESCRIPTION OF THE VULNERABILITY
The referrer field is taken from the HTTP header generated by the user
with his browser. So it's a user-input and it is possibile therefore to
tamper with it.
This is a snip of code taken from the stats page of Wordpress.com dashboard.
If an attacker creates an HTTP request like this, an alert box will be
displayed when the blogger reads his stats:
GET http://www.somewpblog.com/ HTTP/1.1
User-Agent:Mozilla/5.0 (Windows; U; Windows NT 5.0; it; rv:220.127.116.11)