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.
ntpq
atoascii()
potential memory corruption ntpq
is listening for data and the port number it is listening on or if the attacker can provide a malicious instance ntpd
that victims will connect to then an attacker can send a set of crafted mode 6 response packets that, if received by ntpq
, can cause ntpq
to crash.
ntpq
against a server and ntpq
crashes, try again using raw
mode. Build or get a patched ntpq
and see if that fixes the problem. Report new bugs in ntpq
or abusive servers appropriately.
ntpq
in scripts, make sure ntpq
does what you expect in your scripts.