Informationntp is a daemon which implements the Network Time Protocol (NTP). It is designed to synchronize system clocks across a variety of systems and use a source that is highly accurate. More information on NTP can be found at http://www.ntp.org. ntp can be configured to be a client and/or a server.
This recommendation only applies if ntp is in use on the system.
If ntp is in use on the system proper configuration is vital to ensuring time synchronization is working properly.
SolutionAdd or edit restrict lines in /etc/ntp.conf to match the following:
restrict -4 default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery
Add or edit server or pool lines to /etc/ntp.conf as appropriate:
Example vim /etc/ntp.conf
Configure ntp to run as the ntp user by adding or editing one of the following file:
This Benchmark recommendation maps to:
Red Hat Enterprise Linux 7 Security Technical Implementation Guide:
Version 2, Release: 3 Benchmark Date: 26 Apr 2019
Vul ID: V-72269
Rule ID: SV-86893r4_rule
STIG ID: RHEL-07-040500
Severity: CAT II