r1 - 2016-04-27 - 02:38:13 - HarlanStennYou are here: NTP >  Main Web > SecurityNotice > NtpBug2952
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-4.2.8p10 was released on 21 March 2017. It addresses 6 medium- and 5 low-severity security issues, 4 informational security topics, 15 bugfixes, and contains other improvements over 4.2.8p9.

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.

NTP Bug 2952

Original fix for NTP Bug 2901 broke peer associations

  • Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
  • References: Bug 2952 CVE-2015-7704 / VU#718152
  • Affects: 4.2.8p4 up to but not including 4.2.8p7, and 4.3.77 up to, but not including 4.3.92
  • Summary: The fix for NtpBug2901 in ntp-4.2.8p4 went too far, breaking peer associations.
  • Mitigation:
    • Upgrade to 4.2.8p7, or later, from the NTP Project Download Page or the NTP Public Services Project Download Page.
    • Don't connect to ntp-4.2.8p4 thru p6 instances of ntpd using a peer association.
    • If you are running ntp-4.2.8p4 thru p6 instances of ntpd don't expect clients that connect to you with peer associations to work.
    • Monitor your ntpd instances.
  • This weakness was discovered by Michael Tatarinov , NTP Project Developer Volunteer
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