full-disclosure - UnAnonymizer

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Message-ID: <44A1568D.4010206@csuohio.edu>
Date: Tue Jun 27 17:01:51 2006
From: michael.holstein at csuohio.edu (Michael Holstein)
Subject: UnAnonymizer

> The 'trick' is to obtain this information regardless of proxy settings 
> and in the case of SOCKS4, be able to identify your real DNS servers. 
> This is accomplished using a custom DNS service along with a Java applet 
> that abuses the DatagramSocket/GetByName APIs to bypass any configured 
> proxy. The source code of the applet is online as well:
> - http://metasploit.com/research/misc/decloak/HelloWorld.java

Smart TOR users are using Firefox + NoScript + Flashblock to begin with 
.. and you'd really have to be stupid/trusting to allow Javascript (and 
even dumber still to allow Java Applets) when you're trying to be anonymous.

> There are a handful of other ways to obtain a user's real IP address - you 
> can embed a link to a SMB service over a UNC path, start up another 
> application via file attachments (PDF, with embedded JS, etc), or abuse 
> any other network-aware app that is launched by the browser.

Using a WRT54g+Linux+Tor (or running the TOR router on a seperate 
machine) prevents this entirely since *all* traffic is routed into TOR 
and anything that's not falls into the bitbucket.

Those that wish to be anonymous .. always will be :)

/mike.