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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Are you using Autokey in production? If so, please contact Harlan - he's got some questions for you.

NTP Bug 2918

TALOS-CAN-0062: Potential path traversal vulnerability in the config file saving of ntpd on VMS.

• Date Resolved: Stable (4.2.8p4) 21 Oct 2015
• References: Sec 2918 / CVE-2015-7851
• Affects: All ntp-4 releases running under VMS up to, but not including 4.2.8p4, and 4.3.0 up to, but not including 4.3.77
• CVSS: (AV:N/AC:H/Au:M/C:N/I:P/A:C) Base Score: 5.2, worst case
• Summary: If ntpd is configured to allow remote configuration, and if the (possibly spoofed) IP address is allowed to send remote configuration requests, and if the attacker knows the remote configuration password or if ntpd was configured to disable authentication, then an attacker can send a set of packets to ntpd that may cause ntpd to overwrite files.
• Mitigation:
  • Implement BCP-38.
  • Upgrade to 4.2.8p4, or later, from the NTP Project Download Page or the NTP Public Services Project Download Page.
  • If you are unable to upgrade, remote configuration of NTF's ntpd requires:
    • an explicitly configured "trusted" key. Only configure this if you need it.
    • access from permitted IP addresses. You choose the IPs.
    • authentication. Don't disable it. Practice key security safety.
  • Monitor your ntpd instances.
• Credit: This weakness was discovered by Yves Younan of Cisco Talos.