The AIX SSH daemon must be configured to not use host-based authentication.

SSH trust relationships mean a compromise on one host can allow an attacker to move trivially to other hosts.

Check the SSH daemon configuration for allowed host-based authentication using command:

# grep -i HostbasedAuthentication /etc/ssh/sshd_config | grep -v '^#' HostbasedAuthentication no

If no lines are returned, or the returned "HostbasedAuthentication" directive contains "yes", this is a finding.

Edit "/etc/ssh/sshd_config" and add or update the "HostbasedAuthentication" line as: HostbasedAuthentication no

Save the change and restart ssh daemon: # stopsrc -s sshd # startsrc -s sshd