STIGQter: STIG Summary: Red Hat Enterprise Linux 8 Security Technical Implementation Guide Version: 1 Release: 2 Benchmark Date: 23 Apr 2021:

RHEL 8 must securely compare internal information system clocks at least every 24 hours with a server synchronized to an authoritative time source, such as the 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).

DISA Rule

SV-230484r627750_rule

Vulnerability Number

V-230484

Group Title

SRG-OS-000355-GPOS-00143

Rule Version

RHEL-08-030740

Severity

CAT II

CCI(s)

• CCI-001891 - The information system compares internal information system clocks on an organization-defined frequency with an organization-defined authoritative time source.

Weight

10

Fix Recommendation

Configure the operating system 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

Check Contents

Verify RHEL 8 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 DoD 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 DoD time source, this is a finding.

Vulnerability Number

V-230484

Documentable

False

Rule Version

RHEL-08-030740

Severity Override Guidance

Verify RHEL 8 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 DoD 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 DoD time source, this is a finding.

Check Content Reference

M

Target Key

2921

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