r1 - 2018-02-28 - 00:20:49 - HarlanStennYou are here: NTP >  Main Web > SecurityNotice > NtpBug3414
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-4.2.8p11 was released on 27 February 2018. It addresses 2 low-/medium-, 1 informational-/medium-, and 2 low-severity security issues in ntpd, 1 medium-severity security issue in ntpq, and provides over 65 non-security bugfixes and other improvements over 4.2.8p10.

Please see the NTP Security Notice for vulnerability and mitigation details.

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NTP Bug 3414

ntpq: decodearr() can write beyond its 'buf' limits (Medium)

  • Date Resolved: 27 Feb 2018
  • References: Sec 3414 / CVE-2018-7183 / VU#961909
  • Affects: ntpq in ntp-4.2.8p6, up to but not including ntp-4.2.8p11.
  • CVSS2: MED 6.8 (AV:N/AC:M/Au:N/C:P/I:P/A:P)
  • CVSS3: MED 5.0 CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
  • Summary: ntpq is a monitoring and control program for ntpd. decodearr() is an internal function of ntpq that is used to -- wait for it -- decode an array in a response string when formatted data is being displayed. This is a problem in affected versions of ntpq if a maliciously-altered ntpd returns an array result that will trip this bug, or if a bad actor is able to read an ntpq request on its way to a remote ntpd server and forge and send a response before the remote ntpd sends its response. It's potentially possible that the malicious data could become injectable/executable code.
  • Mitigation:
  • Credit: This weakness was discovered by Michael Macnair of Thales e-Security.
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