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NixOS must, for networked systems, compare internal information system clocks at least every 24 hours with a server which is synchronized to one of the redundant United States Naval Observatory (USNO) time servers, or a time server designated for the appropriate DOD network (NIPRNet/SIPRNet), and/or the Global Positioning System (GPS).

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-268149ANIX-00-001420SV-268149r1131099_ruleCCI-004923medium
Description
Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the correct time a particular event occurred on a system is critical when conducting forensic analysis and investigating system events. Sources outside the configured acceptable allowance (drift) may be inaccurate. Synchronizing internal information system clocks provides uniformity of time stamps for information systems with multiple system clocks and systems connected over a network. Organizations should consider endpoints that may not have regular access to the authoritative time server (e.g., mobile, teleworking, and tactical endpoints). Satisfies: SRG-OS-000355-GPOS-00143, SRG-OS-000359-GPOS-00146, SRG-OS-000785-GPOS-00250
STIGDate
Anduril NixOS Security Technical Implementation Guide2025-08-19

Related Frameworks

1 mapping across 3 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

MON-07.1Synchronization With Authoritative Time Source
1.00
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (9) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-17(9)Disconnect or Disable Access
1.00
AU-8Time Stamps
1.00
AU-8(1)Synchronization with Authoritative Time Source
1.00
AU-8(2)Secondary Authoritative Time Source
1.00
CM-6Configuration Settings
1.00
IA-3(1)Cryptographic Bidirectional Authentication
1.00
SC-45System Time Synchronization
1.00
SC-45(1)Synchronization with Authoritative Time Source
1.00
SC-45(2)Secondary Authoritative Time Source
1.00
CCI1 mapping
CCI-004923
1.00

Details

Check Text (C-268149r1131099_chk)

Verify NixOS is configured with an approved time server with the following command: $ timedatectl show-timesync | grep NTPServers SystemNTPServers=tick.usnogps.navy.mil FallbackNTPServers=tock.usnogps.navy.mil If the output of the command does not list authorized time servers, this is a finding.

Fix Text (F-71976r1131098_fix)

Configure NixOS to use approved timeservers. Add the following Nix code to the NixOS Configuration, usually located in /etc/nixos/configuration.nix or /etc/nixos/flake.nix: networking.timeServers = [ "tick.usnogps.navy.mil" "tock.usnogps.navy.mil" ]; Rebuild and switch to the new NixOS configuration: $ sudo nixos-rebuild switch