CVE-2018-7170

Publication date 6 March 2018

Last updated 26 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

ntpd in ntp 4.2.x before 4.2.8p7 and 4.3.x before 4.3.92 allows authenticated users that know the private symmetric key to create arbitrarily-many ephemeral associations in order to win the clock selection of ntpd and modify a victim's clock via a Sybil attack. This issue exists because of an incomplete fix for CVE-2016-1549.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
ntp	25.10 questing	Not in release
	25.04 plucky	Not in release
	24.10 oracular	Not in release
	24.04 LTS noble	Not in release
	23.10 mantic	Not in release
	23.04 lunar	Not in release
	22.10 kinetic	Not in release
	22.04 LTS jammy	Fixed 1:4.2.8p11+dfsg-1ubuntu1
	21.10 impish	Fixed 1:4.2.8p11+dfsg-1ubuntu1
	21.04 hirsute	Fixed 1:4.2.8p11+dfsg-1ubuntu1
	20.10 groovy	Fixed 1:4.2.8p11+dfsg-1ubuntu1
	20.04 LTS focal	Fixed 1:4.2.8p11+dfsg-1ubuntu1
	19.10 eoan	Fixed 1:4.2.8p11+dfsg-1ubuntu1
	19.04 disco	Fixed 1:4.2.8p11+dfsg-1ubuntu1
	18.10 cosmic	Fixed 1:4.2.8p11+dfsg-1ubuntu1
	18.04 LTS bionic	Vulnerable
	17.10 artful	Ignored end of life
	16.04 LTS xenial	Vulnerable
	14.04 LTS trusty	Vulnerable

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
ntp	Upstream: http://bk.ntp.org/ntp-stable/?PAGE=cset&REV=5a5dab3a2_FQ3mvEDDduCKFCgMUHxg Upstream: http://bk.ntp.org/ntp-stable/?PAGE=cset&REV=5a5ecbd3TlxNJ-4bhpgNPrNnk0qyRA Upstream: http://bk.ntp.org/ntp-stable/?PAGE=cset&REV=5a682fbb3GRmeAsQBMaL14IFQKVWIQ Upstream: http://bk.ntp.org/ntp-stable/?PAGE=cset&REV=5a6acee9cAeq0Mxp-nKXzoZdyFjupQ

Severity score breakdown

Parameter	Value
Base score	5.3 · Medium
Attack vector	Network
Attack complexity	High
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N