r1 - 2017-03-22 - 01:31:20 - HarlanStennYou are here: NTP >  Main Web > SecurityNotice > NtpBug3388
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 3388

NTP-01-014 NTP: Buffer Overflow in DPTS Clock (Low)

  • Date Resolved: 21 Mar 2017
  • References: Sec 3388 / CVE-2017-6462 / VU#325339
  • Affects: All versions of NTP, up to but not including ntp-4.2.8p10, and ntp-4.3.0 up to, but not including ntp-4.3.94.
  • CVSS2: Low 1.0 (AV:L/AC:H/Au:S/C:N/I:N/A:P)
  • CVSS3: Low 1.6 CVSS:3.0/AV:P/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L
  • Summary: There is a potential for a buffer overflow in the legacy Datum Programmable Time Server refclock driver. Here the packets are processed from the /dev/datum device and handled in datum_pts_receive(). Since an attacker would be required to somehow control a malicious /dev/datum device, this does not appear to be a practical attack and renders this issue “Low” in terms of severity.
  • Mitigation:
  • Credit: This weakness was discovered by Cure53.
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