r1 - 2016-06-02 - 12:42:01 - HarlanStennYou are here: NTP >  Main Web > SecurityNotice > NtpBug3043
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ntp-4.2.8p10 was released on 21 March 2017. It addresses 6 medium- and 5 low-severity security issues, 4 informational security topics, 15 bugfixes, and contains other improvements over 4.2.8p9.

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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