CVE-2016-1548

Publication date 29 April 2016

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.2 · High

Score breakdown

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

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 end of life
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

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