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The Oracle Linux 9 Security Technical Implementation Guide (V1 R7) has 450 STIG checks. New to STIG checklists? Read What is a STIG checklist?, CKL vs CKLB, and STIG vs SCAP benchmark.
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New to STIG checklists? Read What is a STIG checklist? and CKL vs CKLB.
Verify that OL 9 SSH daemon does 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'
IgnoreRhosts yes
If the value is returned as "no", the returned line is commented out, or no output is returned, this is a finding.
Configure the SSH daemon to not allow rhosts authentication.
Add the following line to "/etc/ssh/sshd_config" or to a file in "/etc/ssh/sshd_config.d" or uncomment the line and set the value to "yes":
IgnoreRhosts yes
The SSH service must be restarted for changes to take effect:
$ sudo systemctl restart sshd.service