r1 - 2016-06-02 - 12:42:01 - HarlanStennYou are here: NTP >  Main Web > SecurityNotice > NtpBug3043
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-4.2.8p12 was released on 14 August 2018. It addresses 1 low-/medium-severity security issue in ntpd, 1 low-severity security issue in ntpq and ntpdc, and provides 27 non-security bugfixes and 4 other improvements over 4.2.8p11.

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 3043

Autokey association reset

  • Date Resolved: 02 June 2016; Dev (4.3.93) 02 June 2016
  • References: Sec 3043 / CVE-2016-4955 / VU#321640
  • Affects: ntp-4, up to but not including ntp-4.2.8p8, and ntp-4.3.0 up to, but not including ntp-4.3.93.
  • CVSS2: LOW 2.6 (AV:N/AC:H/Au:N/C:N/I:N/A:P)
  • CVSS3: LOW 3.7 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
  • Summary: An attacker who is able to spoof a packet with a correct origin timestamp before the expected response packet arrives at the target machine can send a CRYPTO_NAK or a bad MAC and cause the association's peer variables to be cleared. If this can be done often enough, it will prevent that association from working.
  • Mitigation:
  • Credit: This weakness was discovered by Miroslav Lichvar of Red Hat.
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