[tor-talk] New HTTP authorization attack

[stringer at hushmail.me]

Jondos claims that they has uncovered a new attack on web browsers:

"The JonDoFox research team has uncovered a new attack on web 
browsers: Affected are the web browsers Firefox, Chrome and Safari. 
By a hidden call over of a URL with HTTP authentication data, third 
party sites could track a user over several web sites, even if the 
user blocks all cookies and other tracking procedures. For doing 
this, it is sufficient to include a simple CSS file:
<link rel="stylesheet" type="text/css" 
"http://Session:638431048@ipcheck.info/auth.css.php">

You will find a demonstration of this technique on the web site ip-
check.info.

JonDoFox now contains an integrated protection against this attack. 
Third party sites may now no longer receive HTTP authentication 
data from the browser"

Here's the info on their blog:
http://anonymous-proxy-servers.net/blog/index.php?/archives/299-
JonDoFox-2.5.3-Provides-protection-against-new-HTTP-authorization-
attack.html&user_language=en


They add this "Authentication" feature to their anonymity test at 
http://ip-check.info. Of course it shows red(danger)for Tor Browser 
Bundle. Is it true danger or it's just a part of their advertising 
campaign?