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-4.2.8p11 was released on 27 February 2018. It addresses 2 low-/medium-, 1 informational-/medium-, and 2 low-severity security issues in ntpd, 1 medium-severity security issue in ntpq, and provides over 65 non-security bugfixes and other improvements over 4.2.8p10.

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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