blocking telent on open ports

rabeea · 08-11-2004, 12:28 AM

hi,

plz help me find answer of following questions

1)How can we block telent on open ports like 80,23 etc..?

2) if the user able to establish a telnet session to a port? how can we secure that port from exploitation?

thnx
plz do reply
rabeea

ppuru · 08-11-2004, 12:46 AM

When you have kept a port open for its legitimate client (e.g. a browser for port 80), other clients like telnet, nc too will be able to connect to it.

What these clients will be able to do depends on how secure the daemon running on it is.

chort · 08-11-2004, 12:42 PM

There is a detailed discussion on this in the OpenBSD mailing list archives. Please read the whole thread to understand the situation. If you still have questions after reading the entire thread, then post them.

here is a full discussion of your question