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RHEL-09-252020 RHEL 9 must securely compare internal information system clocks at least every 24 hours.

DISA STIG library V2R10
All changes in this version
first version loaded CAT II

Maps to AU-8, AU-8(1), SC-45(1) via CCI-001890, CCI-004923, CCI-004926, CCI-001891, CCI-002046

Title

RHEL 9 must securely compare internal information system clocks at least every 24 hours.

Control

Verify RHEL 9 is securely comparing internal information system clocks at least every 24 hours with an NTP server with the following commands: $ sudo grep maxpoll /etc/chrony.conf server 0.us.pool.ntp.mil iburst maxpoll 16 If the "maxpoll" option is set to a number greater than 16 or the line is commented out, this is a finding. Verify the "chrony.conf" file is configured to an authoritative DoW time source by running the following command: $ sudo grep -i server /etc/chrony.conf server 0.us.pool.ntp.mil If the parameter "server" is not set or is not set to an authoritative DoW time source, this is a finding.

Discussion

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. Depending on the infrastructure being used the "pool" directive may not be supported. Authoritative time sources include the United States Naval Observatory (USNO) time servers, a time server designated for the appropriate DoW network (NIPRNet/SIPRNet), and/or the Global Positioning System (GPS). Satisfies: SRG-OS-000355-GPOS-00143, SRG-OS-000356-GPOS-00144, SRG-OS-000359-GPOS-00146

Related controls

CCI-001890, CCI-001891, CCI-002046, CCI-004923, CCI-004926

Fix

Configure RHEL 9 to securely compare internal information system clocks at least every 24 hours with an NTP server by adding/modifying the following line in the /etc/chrony.conf file. server [ntp.server.name] iburst maxpoll 16