NixOS system configuration file directories must have a mode of "0755" or less permissive.

Without the capability to restrict the roles and individuals that can select which events are audited, unauthorized personnel may be able to prevent the auditing of critical events. Misconfigured audits may degrade the system's performance by overwhelming the audit log. Misconfigured audits may also make it more difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.

Verify that the NixOS audit configuration directories have a mode of "755" or less permissive with the following commands:

$ sudo find -L /etc/audit -type d -exec stat -L -c "%a %n" {} \;

755 /etc/audit

If the audit configuration files have a mode more permissive than "755", this is a finding.

Update the NixOS config, typically stored either in /etc/nixos/configuration.nix or /etc/nixos/flake.nix, to use a mode of 755 or less for directories under /etc/audit.

Rebuild and switch to the new NixOS configuration: $ sudo nixos-rebuild switch