r1 - 2015-10-23 - 08:58:28 - HarlanStennYou are here: NTP >  Main Web > SecurityNotice > NtpBug1593
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-4.2.8p15 was released on 23 June 2020. It addresses 1 medium-severity security issue in ntpd, and provides 13 non-security bugfixes over 4.2.8p13.

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 1593

ntpd abort in free() with logconfig syntax error

  • Date Resolved: Development (4.2.7p42) 18 Aug 2010, Stable (4.2.8) 19 Dec 2014
  • References: Bug 1593 / CVE-2015-5194
  • Affects: All ntp-4 releases up to and including 4.2.7p41.
  • CVSS: (AV:N/AC:H/Au:M/C:N/I:N/A:P) Base Score: 1.7 (worst case)
  • Summary: If ntpd is not built with OpenSSL cryptography and ntpd is told to configure cryptography statistics, ntpd will crash.
  • Mitigation:
    • Don't specify cryptography statistics directives in unpatched releases of ntpd if your ntpd doesn't support cryptography.
    • Upgrade to 4.2.8p4, or later, from the NTP Project Download Page or the NTP Public Services Project Download Page. Yes, you could upgrade to 4.2.7p42 or later, but why would you want to run an intermediate development version instead of the latest supported stable version?
    • Monitor your ntpd instances.
  • Credit: This issue was discovered and fixed by Dave Hart in 2010.
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