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.

ntp-4.2.8p11 was released on 27 February 2018. It addresses 2 low-/medium-, 1 informational-/medium-, and 2 low-severity security issues in ntpd, 1 medium-severity security issue in ntpq, and provides over 65 non-security bugfixes and other improvements over 4.2.8p10.

Please see the NTP Security Notice for vulnerability and mitigation details.

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Are you using Autokey in production? If so, please contact Harlan - he's got some questions for you.

6.6. Adding NTP Server Variables

To create a variable called access_policy just add this line to ntp.conf (see miscopt.htm in the NTP docs):

setvar access_policy="open access" default

It will be transmitted as a default variable and visible from the ntpq -c rv server.host.name command.

-- PiotrTrojanek - 11 Aug 2003