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 GPG: BBB51E42 Download attachment "signature.asc" of type "application/pgp-signature" (837 bytes)
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