r1 - 2016-04-27 - 02:37:19 - HarlanStennYou are here: NTP >  Main Web > SecurityNotice > NtpBug2879
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 medum- 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 2879

Improve NTP security against buffer comparison timing attacks

  • Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
  • References: Sec 2879 / CVE-2016-1550 / VU#718152
  • Affects: All ntp-4 releases up to, but not including 4.2.8p7, and 4.3.0 up to, but not including 4.3.92
  • CVSS2: LOW 2.6 (AV:L/AC:H/Au:N/C:P/I:P/A:N)
  • CVSS3: MED 4.0 (CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N)
  • Summary: Packet authentication tests have been performed using memcmp() or possibly bcmp(), and it is potentially possible for a local or perhaps LAN-based attacker to send a packet with an authentication payload and indirectly observe how much of the digest has matched.
  • Mitigation:
  • Credit: This weakness was discovered independently by Loganaden Velvindron, and Matthew Van Gundy and Stephen Gray of Cisco ASIG.
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