Common Controls Hub
OL 8 must not allow blank or null passwords in the system-auth file.
If an account has an empty password, anyone could log on and run commands with the privileges of that account. Accounts with empty passwords should never be used in operational environments.
Oracle Linux 8 Security Technical Implementation Guide
Check Text ( C-52149r779709_chk )
To verify that null passwords cannot be used, run the following command:
$ sudo grep -i nullok /etc/pam.d/system-auth
If output is produced, this is a finding.
Fix Text (F-52103r779710_fix)
Remove any instances of the "nullok" option in the "/etc/pam.d/system-auth" file to prevent logons with empty passwords.
Note: Manual changes to the listed file may be overwritten by the "authselect" program.