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-4.2.8p11 was released on 27 February 2018. It addresses 2 low-/medium-, 1 informational-/medium-, and 2 low-severity security issues in ntpd, 1 medium-severity security issue in ntpq, and provides over 65 non-security bugfixes and other improvements over 4.2.8p10.

Please see the NTP Security Notice for vulnerability and mitigation details.

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NTP Bug 3386

NTP-01-011 NTP: ntpq_stripquotes() returns incorrect value (Info)

• Date Resolved: 21 Mar 2017
• References: Sec 3386
• 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: None 0.0 (AV:N/AC:H/Au:N/C:N/I:N/A:N)
• CVSS3: None 0.0 CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:N
• Summary: The NTP Mode 6 monitoring and control client, ntpq, uses the function ntpq_stripquotes() to remove quotes and escape characters from a given string. According to the documentation, the function is supposed to return the number of copied bytes but due to incorrect pointer usage this value is always zero. Although the return value of this function is never used in the code, this flaw could lead to a vulnerability in the future. Since relying on wrong return values when performing memory operations is a dangerous practice, it is recommended to return the correct value in accordance with the documentation pertinent to the code.
• 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 discovered by Cure53.