The macOS system must, for networked systems, compare internal information system clocks at least every 24 hours with a server that 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 ID	Version	Rule ID	IA Controls	Severity
V-230753	APPL-11-000014	SV-230753r599842_rule		Medium

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 of 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-000356-GPOS-00144

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 of 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-000356-GPOS-00144

STIG	Date
Apple macOS 11 (Big Sur) Security Technical Implementation Guide	2020-11-27

Details

Check Text ( C-33698r591381_chk )
The TIMED (NTP replacement in Big Sur) service must be enabled on all networked systems. To check if the service is running, use the following command: sudo systemsetup -getusingnetworktime If the following in not returned, this is a finding: Network Time: On To verify that an authorized Time Server is configured, run the following command: sudo systemsetup -getnetworktimeserver Only approved time servers should be configured for use. If no server is configured, or if an unapproved time server is in use, this is a finding.

Check Text ( C-33698r591381_chk )

The TIMED (NTP replacement in Big Sur) service must be enabled on all networked systems. To check if the service is running, use the following command:

sudo systemsetup -getusingnetworktime

If the following in not returned, this is a finding:
Network Time: On

To verify that an authorized Time Server is configured, run the following command:
sudo systemsetup -getnetworktimeserver

Only approved time servers should be configured for use.

If no server is configured, or if an unapproved time server is in use, this is a finding.

Fix Text (F-33671r591382_fix)
To enable the TIMED service, run the following command: /usr/bin/sudo systemsetup -setusingnetworktime on To configure a time server, use the following command: /usr/bin/sudo systemsetup -setnetworktimeserver "server"