STIGQter: STIG Summary: Anduril NixOS Security Technical Implementation Guide Version: 1 Release: 2 Benchmark Date: 01 Oct 2025:

NixOS must synchronize internal information system clocks to the authoritative time source when the time difference is greater than one second.

DISA Rule

SV-268150r1131101_rule

Vulnerability Number

V-268150

Group Title

SRG-OS-000356-GPOS-00144

Rule Version

ANIX-00-001430

Severity

CAT II

CCI(s)

• CCI-004926 - Synchronize the internal system clocks to the authoritative time source when the time difference is greater than organization-defined time period.

Weight

10

Fix Recommendation

Configure NixOS to regularly synchronize the system clock.

Add the following Nix code to the NixOS Configuration, usually located in /etc/nixos/configuration.nix or /etc/nixos/flake.nix:

services.timesyncd.extraConfig = ''
PollIntervalMaxSec=60
'';

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

Check Contents

Verify NixOS synchronizes internal information system clocks to the authoritative time source when the time difference is greater than one second with the following command:

$ grep -iR pollinterval /etc/nixos/

services.timesyncd.extraConfig = "PollIntervalMaxSec=60";

If "PollIntervalMaxSec" is greater than "60", is commented out, or is missing, this is a finding.

Vulnerability Number

V-268150

Documentable

False

Rule Version

ANIX-00-001430

Severity Override Guidance

Verify NixOS synchronizes internal information system clocks to the authoritative time source when the time difference is greater than one second with the following command:

$ grep -iR pollinterval /etc/nixos/

services.timesyncd.extraConfig = "PollIntervalMaxSec=60";

If "PollIntervalMaxSec" is greater than "60", is commented out, or is missing, this is a finding.

Check Content Reference

M

Target Key

5658