full-disclosure - Re: TLS servers with overbroad certificates may mishandle diverted connections

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Date: Mon, 14 Mar 2011 10:57:34 -0400
From: Jeffrey Walton <noloader@...il.com>
To: coderman <coderman@...il.com>
Cc: Matt McCutchen <matt@...tmccutchen.net>, full-disclosure@...ts.grok.org.uk
Subject: Re: TLS servers with overbroad certificates may
 mishandle diverted connections

On Mon, Mar 14, 2011 at 6:43 AM, coderman <coderman@...il.com> wrote:
> On Sun, Mar 13, 2011 at 7:31 PM, Matt McCutchen <matt@...tmccutchen.net> wrote:
>> If I make a TLS connection to example.com, a MITM attacker can divert
>> the connection to any server that bears a certificate valid for
>> example.com, ... especially likely to arise with wildcard certificates.
>> ...
>> I plan to release an automated testing
>> tool, but I decided to go ahead and publicize the issue first.
>
> ...
>
> p.s. marsh ray: wildcard certs are a useful tool when properly applied.
> (though i admit most won't use them properly. par for the crypto course...)
Its always nice when the reception's machine in the lobby is trusted
to act as a web server and serve content.

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