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Message-ID: <20140409122129.43fbe8a6@hboeck.de>
Date: Wed, 9 Apr 2014 12:21:29 +0200
From: Hanno Böck <hanno@...eck.de>
To: Yves-Alexis Perez <corsac@...ian.org>
Cc: oss-security@...ts.openwall.com
Subject: Re: Heartbleed, clients and Android
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
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)
> > Because the latter
> > would include Android. We are all pretty aware that android updates
> > are in large parts nonexistent.
>
> I don't have much clue about Android, but I think I heard heartbeat
> was disabled in Android, but I don't have a link right now. Also, I'm
> unsure what actually use libssl in Android and what uses NSS.
Seems Android disabled Heartbeat in 2012:
https://android.googlesource.com/platform/external/openssl.git/+/android-4.1.2_r1
Still leaves some android versions as potentially vulnerable.
--
Hanno Böck
http://hboeck.de/
mail/jabber: hanno@...eck.de
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