TLS renegotiation MITM

Nikos Mavrogiannopoulos nmav at
Thu Nov 5 22:05:21 CET 2009

Steve Dispensa wrote:
> 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.

Hi thank you for the patch and for identifying the issue as well. I like
both your patch and the fix itself. Would you be interested in signing
the copyright assignment papers for FSF?

best regards,

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