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-4.2.8p15
was 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.
ntpq
and ntpdc
Disclose Origin Timestamp to Unauthenticated Clients ntpd
to get time from multiple sources.
ntpd
with restrict
statements to limit who is allowed to issue ntpq
and ntpdc
queries. Note that ntpdc
queries are disabled by default.
ntpd
instances.