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Date: Sat, 30 Mar 2024 22:46:17 +0100
From: Axel Beckert <abe@...xchevaux.org>
To: Andres Freund <andres@...razel.de>
Cc: oss-security@...ts.openwall.com
Subject: Re: Re: backdoor in upstream xz/liblzma leading to
ssh server compromise
Hi Andres,
On Sat, Mar 30, 2024 at 12:48:50PM -0700, Andres Freund wrote:
> FWIW, RSA_public_decrypt is reachable, regardless of server configuration,
> when using certificate based authentication.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Wait, do you really mean SSH keys verified by certificates issued by a
(usually internal, SSH-specific) certificate authority (CA) for a key?
See e.g.
https://en.wikibooks.org/wiki/OpenSSH/Cookbook/Certificate-based_Authentication
what certificate-based authentication in SSH actually means.
From my experience certificate-based SSH authentication (i.e. those
algorithms with *-cert-* in their names) is rather rare, while simple
public key authentication (where you just put your according pubkey
into .ssh/authorized_keys) is very common.
Can you clarify if you really meant that solely certificate based
authentication (with certificates issued by a CA) triggers that code
path or if you actually meant all sorts of public key based
authentication in general?
Kind regards, Axel
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