R-Services (512,513,514)
Last updated
Last updated
Much like telnet, r-services transmit information from client to server(and vice versa.) over the network in an unencrypted format, making it possible for attackers to intercept network traffic (passwords, login information, etc.) by performing man-in-the-middle (MITM) attacks.
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.