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The Day the Telnet Died

labs.greynoise.io

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Re: The Day the Telnet Died

#21

Post by Laforet »

Twisol wrote: post #5

> Someone upstream of a significant chunk of the internet’s transit infrastructure apparently decided telnet traffic isn’t worth carrying anymore. That’s probably the right call. Does this impact traffic for MUDs at all? I know several MUDs operate on nonstandard Telnet ports, but many still allow connection on port 23. Does this block end-to-end Telnet traffic, or does it only block attempts to access Telnet service…

It seems like they are doing a port based block similar to how residential lines often have their SMTP ports shut off.

That said in this day and age, servers on the public network really ought to use SSH.

Re: The Day the Telnet Died

#23

Post by ieie3366 »

greyface- wrote: post #17
Animats wrote: post #12

So eleven years ago someone put a backdoor in the Telnet daemon. Who? Where's the commit?

https://codeberg.org/inetutils/inetutils/commit/fa3245ac8c28...

That's crazy. This is core business critical software but they just YOLO critical changes without any automated tests? this PR would be insta-rejected in the small SAAS shop I work at.

Re: The Day the Telnet Died

#24

Post by trebligdivad »

Why are people still using telnet across the internet in this century? Was this _all_ attack traffic?

(OK, I know one ancient talker that uses it - but on a very non-standard port so a port 23 block wouldn't be relevant)

Re: The Day the Telnet Died

#25

Post by alt187 »

parl_match wrote: post #13
Animats wrote: post #12

So eleven years ago someone put a backdoor in the Telnet daemon. Who? Where's the commit?

It wasn't a backdoor, just a very serious security bug. Congrats on jumping straight to conspiracy and paranoia, though.

It's only a conspiracy and paranoia if it's wrong. 11 years ago was 2015.

Re: The Day the Telnet Died

#26

Post by mcpherrinm »

trebligdivad wrote: post #24

Why are people still using telnet across the internet in this century? Was this _all_ attack traffic? (OK, I know one ancient talker that uses it - but on a very non-standard port so a port 23 block wouldn't be relevant)

As I understand it, greynoise is monitoring scanner traffic, so yes this would all be scans or attacks

Re: The Day the Telnet Died

#27

Post by [deleted] »

trebligdivad wrote: post #24

Why are people still using telnet across the internet in this century? Was this _all_ attack traffic? (OK, I know one ancient talker that uses it - but on a very non-standard port so a port 23 block wouldn't be relevant)

[deleted]

Re: The Day the Telnet Died

#28

Post by catskull »

When I was an intern for some reason they issued me a voip phone for my desk. One day I got bored and figured out I could telnet into it. Nothing interesting but it was still a fun moment for me!

Re: The Day the Telnet Died

#29

Post by avaer »

ieie3366 wrote: post #23
greyface- wrote: post #17

Earlier quoted context omitted.

https://codeberg.org/inetutils/inetutils/commit/fa3245ac8c28...

That's crazy. This is core business critical software but they just YOLO critical changes without any automated tests? this PR would be insta-rejected in the small SAAS shop I work at.

There's a famous XKCD about this: https://xkcd.com/2347/

In this case the hero's name is apparently Simon Josefsson (maintainer).

Re: The Day the Telnet Died

#30

Post by jaredsohn »

trebligdivad wrote: post #24

Why are people still using telnet across the internet in this century? Was this _all_ attack traffic? (OK, I know one ancient talker that uses it - but on a very non-standard port so a port 23 block wouldn't be relevant)

To watch Star Wars in ASCII.

telnet towel.blinkenlights.nl https://www.youtube.com/watch?v=Mhcf6tc2jeQ

(Remember hearing about this a long time ago (from some searching I think it was in 1999 via Slashdot) and verified some instance of it still exists/works.)

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