The Day the Telnet Died

출처: Hacker News — https://www.labs.greynoise.io/grimoire/2026-02-10-telnet-falls-silent/

• Telnet 서비스 종료 배경

  • 보안 문제로 인한 서비스 중단
  • 사용자와 시스템의 변화 필요

• 사용자 영향

  • 기존 Telnet 의존 시스템의 대체 필요
  • 새로운 연결 방식으로의 전환 요구

• 보안 고려사항

  • Telnet의 취약점 및 대안 제시
  • 안전한 통신 프로토콜로의 이동 필요성 강조

의견

댓글/토론에서 나온 의견을 참고용으로 정리했습니다. (사실로 단정하지 말고 맥락 확인 권장)

• Hacker News · @RupertSalt: Yes, perhaps we should define “MUD” and your incomplete experience of “most”. As a MUD enthusiast for 37 years, I learned to program in C and Unix through TinyMUD, MUCK, and MUSH derived servers. From the beginning, none of these codebases implemted Telnet. There was nothing but a raw transparent TCP connection. In fa…
  • 링크: https://news.ycombinator.com/item?id=46969476
• Hacker News · @Twisol: As a MUD enthusiast of two decades, this is not accurate. Where are you getting this information? Most MUDs implement RFC 854, and a number of non-standard Telnet option subnegotiation protocols have been adopted for compression (MCCP2), transmission of unrendered data (ATCP, GMCP, ZMP), and even a mechanism for enabl…
  • 링크: https://news.ycombinator.com/item?id=46968927
• Hacker News · @RupertSalt: Most MUDs do not use Telnet. MUDs use plaintext TCP protocols that are accessible to a wide range of clients. The Telnet protocol is well-defined and not completely plaintext. There are in-band signaling methods and negotiations. Telnet is defined to live on 23/tcp as an IANA well-known, privileged, reserved port…
  • 링크: https://news.ycombinator.com/item?id=46968716
• Hacker News · @Twisol: The difference between "telnet" the program and "telnet" the protocol is especially important in this discussion, I think. A more "proper" tool for that is netcat -- I doubt SMTP supports the Telnet option negotiations subsystem. (I also doubt SMTP servers can interpret the full suite of …
  • 링크: https://news.ycombinator.com/item?id=46968611
• Hacker News · @acdha: Culture has changed a lot since the 20th century and older projects can have antiquated norms around things like testing. I was just listening to a recent podcast talking about how worrisome it is that OpenSSL has a casual culture about testing[1] and was reminded about how normal that used to be. I think in the case …
  • 링크: https://news.ycombinator.com/item?id=46969073
• Hacker News · @derefr: How do you imagine the telnet daemon would spawn a session as the user that auths in? Arbitrarily becoming another user isn’t a thing a regular user can do; you need to (essentially) be root first to do that. (sudo -u requires sudo(8) to be setuid-root just like plain sudo does.) Were you assuming that telnetd would…
  • 링크: https://news.ycombinator.com/item?id=46969533

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