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-4.2.8p12
was released on 14 August 2018. It addresses 1 low-/medium-severity security issue in ntpd, 1 low-severity security issue in ntpq and ntpdc, and provides 27 non-security bugfixes and 4 other improvements over 4.2.8p11.
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.
ntpd
does not enable trap
service by default. If trap
service 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.conf
file. Only allow mode 6 queries from trusted networks and hosts.
ntpd
instances, and auto-restart ntpd
(without -g
) if it stops running.