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 3376

NTP-01-001 NTP: Makefile does not enforce Security Flags (Informational)

• Date Resolved: 21 Mar 2017
• References: Sec 3376
• 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: N/A
• CVSS3: N/A
• Summary: The build process for NTP has not, by default, provided compile or link flags to offer "hardened" security options. Package maintainers have always been able to provide hardening security flags for their builds. As of ntp-4.2.8p10, the NTP build system has a way to provide OS-specific hardening flags. Please note that this is still not a really great solution because it is specific to NTP builds. It's inefficient to have every package supply, track and maintain this information for every target build. It would be much better if there was a common way for OSes to provide this information in a way that arbitrary packages could benefit from it.
• Mitigation:
  • Implement BCP-38.
  • Upgrade to 4.2.8p10, or later, from the NTP Project Download Page or the NTP Public Services Project Download Page
  • Properly monitor your ntpd instances, and auto-restart ntpd (without -g) if it stops running.
• Credit: This weakness was reported by Cure53.