r1 - 2016-11-21 - 14:03:43 - HarlanStennYou are here: NTP >  Main Web > SecurityNotice > NtpBug3118
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-4.2.8p9 was released on 21 November 2016. It addresses 1 high- (Windows only), 2 medum-, 2 medum-/low-, and 5 low-severity security issues, 28 bugfixes, and contains other improvements over 4.2.8p8.

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

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NTP Bug 3118

Mode 6 unauthenticated trap information disclosure and DDoS vector

  • Date Resolved: 21 Nov 2016
  • References: Sec 3118 / CVE-2016-9310 / VU#633847
  • Affects: ntp-4.0.90 (21 July 1999), possibly earlier, up to but not including ntp-4.2.8p9, and ntp-4.3.0 up to, but not including ntp-4.3.94.
  • CVSS2: MED 6.4 (AV:A/AC:L/Au:N/C:N/I:N/A:P)
  • CVSS3: MED 6.5 CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  • Summary: An exploitable configuration modification vulnerability exists in the control mode (mode 6) functionality of ntpd. If, against long-standing BCP recommendations, "restrict default noquery ..." is not specified, a specially crafted control mode packet can set ntpd traps, providing information disclosure and DDoS amplification, and unset ntpd traps, disabling legitimate monitoring. A remote, unauthenticated, network attacker can trigger this vulnerability.
  • Mitigation:
  • Credit: This weakness was discovered by Matthew Van Gundy of Cisco.
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