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Message-ID: <20140409103634.GD5507@scapa.corsac.net>
Date: Wed, 9 Apr 2014 12:36:35 +0200
From: Yves-Alexis Perez <corsac@...ian.org>
To: oss-security@...ts.openwall.com
Subject: Re: Heartbleed, clients and Android
On Wed, Apr 09, 2014 at 12:21:29PM +0200, Hanno Böck wrote:
> On Wed, 9 Apr 2014 11:54:58 +0200
> Yves-Alexis Perez <corsac@...ian.org> wrote:
>
> > On Wed, Apr 09, 2014 at 11:30:29AM +0200, Hanno Böck wrote:
> > > I was asking myself some questions and I think others with more
> > > insight into what heartbleed means may be able to answer quickly:
> > > How does this affect client software? The PoCs we see send some
> > > malicous payload to servers and get some memory dumps. That doesn't
> > > affect clients?
> >
> > Yes, it does affect clients.
>
> Can anyone explain how an attack scenario would work?
> Is it like:
> * we have a Man-in-the-Middle.
> * Client/Server establish connection.
> * MitM inserts a malicious package with the heartbeat-payload and sends
> it to the client, client parses package, verifying MAC fails, but it
> still will output memory
Heartbeat can be sent before the ChangeCipherSpec message is sent, so
you don't have any TLS protection for that MITM.
So yeah, you can sit at a nearby wireless hotspot, wait for any client
to do some TLS trafic and heartbleed them (providing the client uses
OpenSSL).
>
> Or is it ONLY an issue if we contact a malicious server that may
> extract random information from the application's memory? (which would
> reduce the impact somewhat, e.g. operating system update systems or
> wget etc. wouldn't have to worry)
It's not hard to make people contact malicious servers, I think.
Regards,
--
Yves-Alexis Perez
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