full-disclosure - Re: New Vulnerability against Firefox/ Major Extensions

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Message-ID: <20070530104938.GA2891@sentinelchicken.org>
Date: Wed, 30 May 2007 06:49:38 -0400
From: Tim <tim-security@...tinelchicken.org>
To: Christopher Soghoian <csoghoian@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: New Vulnerability against Firefox/ Major
	Extensions

> A DNS based man in the middle attack will not work against a SSL
> enabled webserver. This is because SSL certificates certify an
> association between a specific domain name and an ip address. An
> attempted man in the middle attack against a SSL enabled Firefox
> update server will result in the browser rejecting the connection to
> the masquerading update server, as the ip address in the SSL
> certificate, and the ip address returned by the DNS server will not
> match.

False.  SSL certificates do not authenticate DNS/IP associations.  They
authenticate public key/DNS associations.  The difference is likely
irrelevant to this issue, but be sure you understand SSL's PKI when you
explain such things, lest you confuse crypto noobs.

tim

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