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-4.2.8p15was 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.
ntpdis fed a crafted mode 6 or mode 7 packet containing an unusually long data value where a network address is expected, the
decodenetnum()function will abort with an assertion failure instead of simply returning a failure condition.
restrict noqueryto limit who can send mode 6 and mode 7 requests.
requestkeyauthentication directives to limit who can send mode 6 and mode 7 requests.