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.
ntpd
was expressly configured to allow for remote configuration, a malicious user who knows the controlkey
for ntpq
or the requestkey
for ntpdc
(if mode7
is expressly enabled) can create a session with ntpd
and then send a crafted packet to ntpd
that will change the value of the trustedkey
, controlkey
, or requestkey
to a value that will prevent any subsequent authentication with ntpd
until ntpd
is restarted.
ntpd
instances