Nutanix AOS must compare internal information system clocks at least every 24 hours with a server 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-254182	NUTX-OS-000890	SV-254182r846801_rule		Low

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 must 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 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 must 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
Nutanix AOS 5.20.x OS Security Technical Implementation Guide	2022-08-24

Details

Check Text ( C-57667r846632_chk )
Confirm Nutanix AOS is running the NTP service. # sudo ps -ef \| grep ntp ntp 7447 1 0 Aug17 ? 00:00:05 /usr/sbin/ntpd -u ntp:ntp -g If the NTP service is not running, this is a finding. Next Check the ntp.conf file for the "maxpoll" option setting. $ sudo grep maxpoll /etc/ntp.conf server #.#.#.# maxpoll 10 If the option is set to "17" or is not set, this is a finding.

Fix Text (F-57618r846633_fix)
Log in to the Nutanix CVM. Run the following command to add a list of DoD Approved NTP servers: $ ncli cluster add-to-ntp-servers servers=IP_1,IP_2,IP_3