Why are ports less than 1024 called "insecure"?

Question

System administration

Actually the question is in the header.
Interested in where this name came from and what caused fears.

Answer 1

Perhaps this adjective is used to protect young administrators from running their leaky services as root
. Tk ports up to 1024 for binding require superuser rights as a root
. After hacking a leaky service, a hacker gets root access to the server
. Of course, Linux implements safe work with this kind of thing, but it is most often found out after losing access to the car

Answer 2

Usually the range is occupied by system services, you can take the port required by the system.
It seems like..

Answer 3

It's against the fool. In order not to put some service on the used port and then complain that it "does not work" / the service does not start.
See https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_...
For example, there are no nodes currently in use on ports 1-8.

Answer 4

nmap

Answer 5

Read
https://tools.ietf.org/html/rfc6056