NTP users are strongly urged to take immediate action to ensure that their NTP daemons are not susceptible to being used in distributed denial-of-service (DDoS) attacks. Please also take this opportunity to defeat denial-of-service attacks by implementing Ingress and Egress filtering through BCP38.See AddingNTPServerVariablesDev for discussion of this topic.
ntp-4.2.8p15was released on 23 June 2020. It addresses 1 medium-severity security issue in ntpd, and provides 13 non-security bugfixes over 4.2.8p13.
Please see the NTP Security Notice for vulnerability and mitigation details.Are you using Autokey in production? If so, please contact Harlan - he's got some questions for you.
access_policyjust add this line to
ntp.conf(see miscopt.htm in the NTP docs):
setvar access_policy="open access" defaultIt will be transmitted as a default variable and visible from the
ntpq -c rv server.host.namecommand. -- PiotrTrojanek - 11 Aug 2003