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-4.2.8p13
was released on 07 March 2019. It addresses 1 medium-severity security issue in ntpd, and provides 17 non-security bugfixes and 1 other improvements over 4.2.8p12.
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
) packet from a permitted network address can trigger a NULL pointer dereference, crashing ntpd
. Note that for this attack to work, the sending system must be on an address that the target's ntpd
accepts mode 6 packets from, and must use a private key that is specifically listed as being used for mode 6 authorization.
restrict noquery
to limit addresses that can send mode 6 queries.
controlkey
in ntp.keys
.