r1 - 2020-06-23 - 11:25:12 - HarlanStennYou are here: NTP >  Main Web > SecurityNotice > NtpBug3661
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.

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NTP Bug 3661

Memory leak with CMAC keys

  • Date Resolved: Stable (4.2.8p15) and Development (4.3.101), 28 Apr 2020
  • References: Bug 3661 / CVE-2020-XXXX
  • Affects: ntp-4.2.8p11 up to, but not including ntp-4.2.8p15, and 4.3.97 up to, but not including 4.3.101. Resolved in 4.2.8p15 and 4.3.101.
  • CVSS2: 6.3 - (AV:N/AC:M/Au:S/C:N/I:N/A:C)
  • CVSS3.1: 4.4 - (CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H)
  • Summary: Systems that use a CMAC algorithm in ntp.keys will not release a bit of memory on each packet that uses a CMAC keyid, eventually causing ntpd to run out of memory and fail. The CMAC cleanup from https://bugs.ntp.org/3447, part of ntp-4.2.8p11, introduced a bug whereby the CMAC data structure was no longer completely removed.
  • Mitigation:
  • Credit: Reported by Martin Burnicki of Meinberg.

  • 2020 Jun 23: Public release
  • 2020 Apr 12: Release to Advance Security Partners
  • 2020 Apr 07: Notification to Institutional Members
  • 2020 Apr 01: Notification from reporter
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