RHEL 10 must be configured so that the Secure Shell (SSH) daemon does not allow rhosts authentication.

SSH trust relationships mean a compromise on one host can allow an attacker to move trivially to other hosts. OpenSSH uses the first occurrence of a keyword it sees, and drop-in files are read in lexicographical order at the start of the configuration. Red Hat recommends using drop-in files rather than changing base configuration files.

Verify RHEL 10 SSH daemons do not allow rhosts authentication with the following command: $ sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iH '^\s*ignorerhosts' /etc/ssh/sshd_config.d/10-stig.conf:IgnoreRhosts yes Verify the runtime setting with the following command: $ sudo sshd -T | grep -i ignorerhosts ignorerhosts yes If the "IgnoreRhosts" keyword is not set to "yes" in a drop-in that lexicographically precedes 50-redhat.conf, or if no output is returned, this is a finding.

Configure RHEL 10 SSH daemons to not allow rhosts authentication. In "/etc/ssh/sshd_config.d", create a drop file that will lexicographically precede 50-redhat.conf and add the following line: IgnoreRhosts yes Restart the SSH service with the following command for the changes to take effect: $ sudo systemctl restart sshd.service