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.
datalenparameter will overflow a data buffer. NTF's
ntpddriver implementations always set this value to 0 and are therefore not vulnerable to this weakness. If you are running a custom refclock driver in
ntpdand that driver supplies a negative value for
datalen(no custom driver of even minimal competence would do this) then
ntpdwould overflow a data buffer. It is even hypothetically possible in this case that instead of simply crashing
ntpdthe attacker could effect a code injection attack.