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The Oracle Linux 8 Security Technical Implementation Guide (V2 R10) has 378 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 the SSH public host key files have mode "0644" or less permissive with the following command:
$ sudo ls -l /etc/ssh/*.pub
-rw-r--r-- 1 root wheel 618 Nov 28 06:43 ssh_host_dsa_key.pub
-rw-r--r-- 1 root wheel 347 Nov 28 06:43 ssh_host_key.pub
-rw-r--r-- 1 root wheel 238 Nov 28 06:43 ssh_host_rsa_key.pub
If any "key.pub" file has a mode more permissive than "0644", this is a finding.
Note: SSH public key files may be found in other directories on the system depending on the installation.
Change the mode of public host key files under "/etc/ssh" to "0644" with the following command:
$ sudo chmod 0644 /etc/ssh/*key.pub
The SSH daemon must be restarted for the changes to take effect. To restart the SSH daemon, run the following command:
$ sudo systemctl restart sshd.service