r1 - 2016-01-20 - 11:40:34 - HarlanStennYou are here: NTP >  Main Web > SecurityNotice > NtpBug2935
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-4.2.8p10 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.

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NTP Bug 2935

Deja Vu: Replay attack on authenticated broadcast mode

  • Date Resolved: Stable (4.2.8p6) 19 Jan 2016; Dev (4.3.90) 19 Jan 2016
  • References: Sec 2935 / CVE-2015-7973
  • Affects: All ntp-4 releases up to, but not including 4.2.8p5, and 4.3.0 up to, but not including 4.3.90
  • CVSS: (AV:A/AC:M/Au:N/C:N/I:P/A:P) Base Score: 4.3 MEDIUM
  • Summary: If an NTP network is configured for broadcast operations, then either a man-in-the-middle attacker or a malicious participant that has the same trusted keys as the victim can replay time packets.
  • Mitigation:
  • Credit: This weakness was discovered by Aanchal Malhotra <aanchal4@bu.edu> of Boston University.
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