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

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Message-ID: <24699370.3201189173893786.JavaMail.root@gw.noorhome.net>
Date: Fri, 7 Sep 2007 10:04:53 -0400 (EDT)
From: Arshad Noor <arshad.noor@...ongauth.com>
To: full-disclosure@...ts.grok.org.uk, dev-security@...ts.mozilla.org, 
	dev-tech-crypto@...ts.mozilla.org
Subject: Re: Firefox 2.0.x: tracking unsuspecting users
	using TLS client	certificates

Alex,

Do you presume that the websites in the domains that you intend
to track users will install the self-signed CA certificate that
issued the client-certificate to the unsuspecting user?  If not,
how will the browser know which client certificate to send to 
the website during client-auth?  And what happens to the users
who do not have have client-certs issued by this CA when they
attempt to connect to the site?

Arshad Noor
StrongAuth, Inc.

----- Original Message -----
From: "Alexander Klink" <a.klink@...ops.de>

Tracking visitors in an unnoticed way over several domains is typically
not as easy as this, I believe.

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