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-4.2.8p9was released on 21 November 2016. It addresses 1 high- (Windows only), 2 medum-, 2 medum-/low-, and 5 low-severity security issues, 28 bugfixes, and contains other improvements over 4.2.8p8.
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.
ntpddoes not enable
trapservice by default. If
trapservice has been explicitly enabled, an attacker can send a specially crafted packet to cause a null pointer dereference that will crash
ntpd, resulting in a denial of service.
ntp.conffile. Only allow mode 6 queries from trusted networks and hosts.
ntpdinstances, and auto-restart
-g) if it stops running.