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Re: Telnet and FTP to Historic

Michael Richardson <mcr@sandelman.ca> Thu, 03 December 2020 00:41 UTC

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From: Michael Richardson <mcr@sandelman.ca>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
cc: Mark Andrews <marka@isc.org>, "Scott O. Bradner" <sob@sobco.com>, "John C. Klensin" <john-ietf@jck.com>, Carsten Bormann <cabo@tzi.org>, Phillip Hallam-Baker <phill@hallambaker.com>, IETF Discussion Mailing List <ietf@ietf.org>
Subject: Re: Telnet and FTP to Historic
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Date: Wed, 02 Dec 2020 19:41:36 -0500
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Stephen Farrell <stephen.farrell@cs.tcd.ie> wrote:
    >>> Hiya,
    >>>
    >>> On 02/12/2020 23:19, Scott O. Bradner wrote:
    >>>> I fully agree with John
    >>>> I see no justification to move telnet &/or FTP to historic since they are in use (even if
    >>>> some people would rather that not be the case) and neither presents a clear danger
    >>>> to the proper functioning of the Internet
    >>>
    >>> I gotta wonder about that last. Wouldn't it be credible to
    >>> argue that telnet is in fact a real danger, if one looks at
    >>> all the CVEs that've reported on ports with admin/admin
    >>> access? I'm not sure if it'd be the right thing to do, but
    >>> I do think one can credibly argue that deprecating telnet
    >>> might be worthwhile.
    >>
    >> Default passwords with admin/admin is an orthogonal issue.  It can happen just as
    >> easily with SSH or HTTPS as with TELNET.  Telnet has risks but don’t blame TELNET
    >> for bad password selection.

    > Well, yes and no. With telnet that credential is leaked
    > to everyone listening on the network and with ssh, mostly
    > there's sshd_config that can be used to repair a dodgy
    > initial deployment.

Replacing telnet with ssh and still using passwords that never get changed is
less secure in my opinion.   You mention "sshd_config", but frankly, if you
knew how to do that, then you wouldn't have the problem in the first place.

At least nobody pretends telnet is secure.

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