Amazon Linux 2023 must configure the use of the pam_faillock.so module in the /etc/pam.d/system-auth file.

If the pam_faillock.so module is not loaded, the system will not correctly lockout accounts to prevent password guessing attacks.

Verify Amazon Linux 2023 is configured so that the pam_faillock.so module is present in the "/etc/pam.d/system-auth" file:

$ grep pam_faillock.so /etc/pam.d/system-auth auth required pam_faillock.so preauth auth required pam_faillock.so authfail account required pam_faillock.so

If the pam_faillock.so module is not present in the "/etc/pam.d/system-auth" file with the "preauth" line listed before pam_unix.so, this is a finding.

Configure Amazon Linux 2023 to include the use of the pam_faillock.so module in the /etc/pam.d/system-auth file.

Add/modify the appropriate sections of the "/etc/pam.d/system-auth" file to match the following lines: Note: The "preauth" line must be listed before pam_unix.so.

auth required pam_faillock.so preauth auth required pam_faillock.so authfail account required pam_faillock.so