CVE-2016-1548

Publication date 29 April 2016

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

An attacker can spoof a packet from a legitimate ntpd server with an origin timestamp that matches the peer->dst timestamp recorded for that server. After making this switch, the client in NTP 4.2.8p4 and earlier and NTPSec aa48d001683e5b791a743ec9c575aaf7d867a2b0c will reject all future legitimate server responses. It is possible to force the victim client to move time after the mode has been changed. ntpq gives no indication that the mode has been switched.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
ntp	17.04 zesty	Not affected
	16.10 yakkety	Not affected
	16.04 LTS xenial	Fixed 1:4.2.8p4+dfsg-3ubuntu5.3
	15.10 wily	Ignored
	14.04 LTS trusty	Fixed 1:4.2.6.p5+dfsg-3ubuntu2.14.04.10
	12.04 LTS precise	Fixed 1:4.2.6.p3+dfsg-1ubuntu3.11

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://bk1.ntp.org/ntp-stable/?PAGE=patch&REV=570ef991qHXRv1LCIXmoOomFNvjm3w Vendor: http://pkgs.fedoraproject.org/cgit/rpms/ntp.git/tree/ntp-4.2.6p5-cve-2016-1548.patch

Severity score breakdown

Parameter	Value
Base score	7.2 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Changed
Confidentiality	None
Integrity impact	Low
Availability impact	Low
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L

References

Related Ubuntu Security Notices (USN)

USN-3096-1
NTP vulnerabilities
5 October 2016