r1 - 2017-03-22 - 01:34:43 - HarlanStennYou are here: NTP >  Main Web > SecurityNotice > NtpBug3384
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 3384

NTP-01-009 NTP: Privileged execution of User Library code (WINDOWS PPSAPI ONLY) (Low)

  • Date Resolved: 21 Mar 2017
  • References: Sec 3384 / CVE-2017-6455 / VU#325339
  • Affects: All Windows versions of ntp-4 that use the PPSAPI, 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 3.8 (AV:L/AC:H/Au:S/C:N/I:N/A:C)
  • CVSS3: MED 4.0 CVSS:3.0/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
  • Summary: The Windows NT port has the added capability to preload DLLs defined in the inherited global local environment variable PPSAPI_DLLS. The code contained within those libraries is then called from the NTPD service, usually running with elevated privileges. Depending on how securely the machine is setup and configured, if ntpd is configured to use the PPSAPI under Windows this can easily lead to a code injection.
  • Mitigation:
  • Credit: This weakness was discovered by Cure53.
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