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Date: Tue, 14 Oct 2014 09:21:38 +0200
From: Hanno Böck <>
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 <>:

> On 14 October 2014 00:09, Hanno Böck <> wrote:
> > I think this deserves a CVE:
> >
> 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

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

Hanno Böck


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