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Date: Wed, 10 Apr 2024 01:47:33 +0200
From: Christoph Anton Mitterer <calestyo@...entia.org>
To: oss-security@...ts.openwall.com
Subject: Re: xz backdoor prevention using hosts.deny?
On Tue, 2024-04-09 at 16:36 -0700, Andres Freund wrote:
> See https://www.openwall.com/lists/oss-security/2024/03/30/37 for the
> path
> leading to certification validation before certificate validity,
> users, etc
> are checked.
And I assume "etc" includes access control via hosts.deny?
So in other words, people who had a backdored sshd running, that
was only protected via hosts.deny may have actually been compromised?
Unless[0] of course, access was blocked by netfilter, some
other firewall, router, etc. ... or sshd wasn't even running.
Right?
Cheers,
Chris
[0] And this assumes that no home calling (like automatic command/code
pulling from the adversary, or submission of e.g. found private
keys) and no further attack vectors (other than via sshd) or
infestations (like creating new users or authorized_keys entries)
are to be found...
... which AFAIU is not yet definitely ruled out?
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