r1 - 2015-10-23 - 09:03:11 - HarlanStennYou are here: NTP >  Main Web > SecurityNotice > NtpBug2899 > NtpBug2671
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 2671

vallen is not validated in several places in ntp_crypto.c, leading to a potential info leak or possibly crashing ntpd.

  • References: Sec 2671 / CVE-2014-9297 / VU#852879
  • Affects: All NTP4 releases before 4.2.8p1 that are running autokey.
  • CVSS: (AV:N/AC:L/Au:N/C:P/I:P/A:P) Base Score: 7.5
  • Date Resolved: Stable (4.2.8p1) 04 Feb 2015
  • Summary: The vallen packet value is not validated in several code paths in ntp_crypto.c which can lead to information leakage or a possible crash of ntpd.
  • Mitigation - any of:
  • Credit: This vulnerability was discovered by Stephen Roettger of the Google Security Team, with additional cases found by Sebastian Krahmer of the SUSE Security Team and Harlan Stenn of Network Time Foundation.
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