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Message-ID: <20141014092138.47641ff3@pc>
Date: Tue, 14 Oct 2014 09:21:38 +0200
From: Hanno Böck <hanno@...eck.de>
To: oss-security@...ts.openwall.com
Subject: Re: CVE request: ejabberd compression allows
cirucumvention of encryption despite starttls_required
Am Tue, 14 Oct 2014 12:39:48 +1100
schrieb Michael Samuel <mik@...net.net>:
> On 14 October 2014 00:09, Hanno Böck <hanno@...eck.de> wrote:
> > I think this deserves a CVE:
> > http://mail.jabber.org/pipermail/operators/2014-October/002438.html
>
> If a client is willing to do that, then an attacker can simply force
> downgrade the client and connect to the server using TLS. (Assuming
> client certificates aren't in use)
Basically these things often work under a more or less
"trust-on-first-use"-assumption.
E.g. the client will check the server config on the first connection
and use that settings in the future.
So there is a scenario where this leads to unintended unencrypted
connections.
--
Hanno Böck
http://hboeck.de/
mail/jabber: hanno@...eck.de
GPG: BBB51E42
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