full-disclosure - Re: Firefox 2.0.x: tracking unsuspecting users using TLS client certificates

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Message-ID: <20070908.c0d392a707e5879438d144651cc98018@cynops.de>
Date: Sat, 8 Sep 2007 00:04:11 +0200
From: Alexander Klink <a.klink@...ops.de>
To: full-disclosure@...ts.grok.org.uk
Subject: Re: Firefox 2.0.x: tracking unsuspecting users
	using	TLS client certificates

Hi Peter,

On Fri, Sep 07, 2007 at 08:10:23PM +0200, Alexander Klink wrote:
> > While I can see the same use here, it seems you are saying anyone could 
> > have a look at certificates on your system, while cookies generally are 
> > limited to viewing by the issuing domain. What I don't understand is if 
> > there is a simple of knowing what certificate to ask for? For this to be 
> No, you can't really 'ask' for a certificate - the user chooses it 
> (or, in this case, the browser does so automatically).
Hmmm, I stand corrected (from Erik, who else? ;-). TLS actually allows
the server to ask for a specific type and/or CA.

Best regards,
  Alex
-- 
Dipl.-Math. Alexander Klink | IT-Security Engineer |    a.klink@...ops.de
 mobile: +49 (0)178 2121703 |          Cynops GmbH | http://www.cynops.de
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