TLS renegotiation MITM

Simon Josefsson simon at
Fri Nov 6 16:50:17 CET 2009

"Steve Dispensa" <dispensa at> writes:

> Glad to. What's the best git tree? I thought I had the right one based
> on the site.

What link did you find on our site?  I created a new page at with some information.


> Thanks.
>  -Steve
> On Nov 6, 2009, at 5:36 AM, "Simon Josefsson" <simon at>
> wrote:
>> Steve Dispensa <dispensa at> writes:
>>> Hi,
>>> A colleague and I have released details of a new attack against TLS
>>> in the
>>> area of renegotiation. Information is here:
>>> During the process of running this bug (and its proposed solution) to
>>> ground, I implemented a patch to GNUTLS, attached. There are also
>>> two new
>>> files that implement the extension that solves the problem.
>>> There is lots of background in the above link, but the one missing
>>> part is
>>> the Internet Draft that has been tentatively agreed on by most of
>>> the major
>>> vendors (pending IETF action, of course). That draft is what I have
>>> implemented, and you should see it posted to the TLS IETF list
>>> tomorrow
>>> morning.
>>> I'd be happy to help in any way I can.
>> What GnuTLS version is your patch for?  We haven't used a
>> file in a long time.  Would you mind reworking it for GnuTLS 2.8.x
>> and/or 2.9.x?  Those are the latest stable and experimental branches.
>> Once the copyright paper issue has been resolved, we could integrate
>> it.
>> /Simon

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