9.1.13.5. Least Privilege

The SSH service runs under the ssh user and ssh group. This is allows directory permissions to limit the service’s access to files/directories not owned by the ssh user/group. The ssh user does not have a valid login shell.

X11 forwarding over SSH is explicitly disallowed. This limits the exposure of the SSH server to networks outside of the control of SIMP.

References: AC-6 : LEAST PRIVILEGE