[512,513,514] R-Services

#Footprinting
Intrusionz3r0X@htb[/htb]$ sudo nmap -sV -p 512,513,514 10.0.17.2
# Log in using rlogin
Intrusionz3r0X@htb[/htb]$ rlogin 10.0.17.2 -l htb-student

#List autghenticated users
Intrusionz3r0X@htb[/htb]$ rwho

Intrusionz3r0X@htb[/htb]$ rusers -al 10.0.17.5

Command	Service Daemon	Port	Transport Protocol	Description
rcp	rshd	514	TCP	Copy a file or directory bidirectionally from the local system to the remote system (or vice versa) or from one remote system to another. It works like the cp command on Linux but provides no warning to the user for overwriting existing files on a system.
rsh	rshd	514	TCP	Opens a shell on a remote machine without a login procedure. Relies upon the trusted entries in the /etc/hosts.equiv and .rhosts files for validation.
rexec	rexecd	512	TCP	Enables a user to run shell commands on a remote machine. Requires authentication through the use of a username and password through an unencrypted network socket. Authentication is overridden by the trusted entries in the /etc/hosts.equiv and .rhosts files.
rlogin	rlogind	513	TCP	Enables a user to log in to a remote host over the network. It works similarly to telnet but can only connect to Unix-like hosts. Authentication is overridden by the trusted entries in the /etc/hosts.equiv and .rhosts files.