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Re (2): Terminals in X Window System.

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In article <20250313201054.0371059b@ryz.dorfdsl.de>, 
Marco Moock <mm@dorfdsl.de> wrote: 
> Now a really stupid question: Why do you need a local telnet server?
> Isn't xterm, and if needed, su, enough?

Absoutely reasonable to ask.  The client side of the communication 
does not have xterm or su.  
https://en.wikibooks.org/wiki/Oberon/A2

A2 has a secure shell but I tend to use the Oberon subsystem.
Oberon has an old ssh client.  Needs major work for compatibility 
with the current environment.

From: Richard Kettlewell <invalid@invalid.invalid>
Date: Thu, 13 Mar 2025 21:11:40 +0000
> A telnetd without a password will allow lateral movement from other 
> UIDs.

I am the only user of the system and it has shorewall and I give a 
password to log in.  As I understand, laterality isn't possible.

As a system becomes more complex, there is more scope for vulnerability.
Eg. https://en.wikipedia.org/wiki/XZ_Utils_backdoor

The reply of Prof. Wirth to the question at 49:40 is pertinent.  
"No side doors and no backdoors."
https://www.youtube.com/watch?v=EXY78gPMvl0  

Regards,                           ... P.

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Terminals in X Window System. peter@easthope.ca - 2025-03-12 06:41 -0700
  Re: Terminals in X Window System. Marco Moock <mm@dorfdsl.de> - 2025-03-12 17:08 +0100
    Re: Terminals in X Window System. Richard Kettlewell <invalid@invalid.invalid> - 2025-03-12 19:31 +0000
    Re: Terminals in X Window System. peter@easthope.ca - 2025-03-13 08:28 -0700
      Re: Terminals in X Window System. Marco Moock <mm@dorfdsl.de> - 2025-03-13 20:10 +0100
        Re: Terminals in X Window System. Grant Taylor <gtaylor@tnetconsulting.net> - 2025-03-13 21:38 -0500
        Re (2): Terminals in X Window System. peter@easthope.ca - 2025-03-14 13:09 -0700
          Re: Re (2): Terminals in X Window System. Richard Kettlewell <invalid@invalid.invalid> - 2025-03-14 21:04 +0000
            Re (3): Terminals in X Window System. peter@easthope.ca - 2025-03-16 08:21 -0700
              Re: Re (3): Terminals in X Window System. Richard Kettlewell <invalid@invalid.invalid> - 2025-03-16 16:13 +0000
        Re: Terminals in X Window System. William Unruh <unruh@invalid.ca> - 2025-03-19 15:52 +0000
      Re: Terminals in X Window System. Richard Kettlewell <invalid@invalid.invalid> - 2025-03-13 21:11 +0000
        Re: Terminals in X Window System. peter@easthope.ca - 2025-03-23 11:23 -0700
          Re: Terminals in X Window System. Richard Kettlewell <invalid@invalid.invalid> - 2025-03-23 19:34 +0000
            Re (2): Terminals in X Window System. peter@easthope.ca - 2025-03-23 22:02 -0700
          Re: Terminals in X Window System. William Unruh <unruh@invalid.ca> - 2025-03-26 06:02 +0000

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