r1 - 2017-03-22 - 01:32:14 - HarlanStennYou are here: NTP >  Main Web > SecurityNotice > NtpBug3387
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-4.2.8p12 was released on 14 August 2018. It addresses 1 low-/medium-severity security issue in ntpd, 1 low-severity security issue in ntpq and ntpdc, and provides 27 non-security bugfixes and 4 other improvements over 4.2.8p11.

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 3387

NTP-01-012 NTP: Authenticated DoS via Malicious Config Option (Medium)

  • Date Resolved: 21 Mar 2017
  • References: Sec 3387 / CVE-2017-6463 / 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: MED 4.6 (AV:N/AC:H/Au:M/C:N/I:N/A:C)
  • CVSS3: MED 4.2 CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
  • Summary: A vulnerability found in the NTP server allows an authenticated remote attacker to crash the daemon by sending an invalid setting via the :config directive. The unpeer option expects a number or an address as an argument. In case the value is 0, a segmentation fault occurs.
  • Mitigation:
  • Credit: This weakness was discovered by Cure53.
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