CVE-2016-1548

Published: 29 April 2016

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.

Priority

Medium

CVSS 3 base score: 7.2

Status

Package Release Status
ntp
Launchpad, Ubuntu, Debian
Upstream
Released (1:4.2.8p7+dfsg-1)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (1:4.2.8p4+dfsg-3ubuntu5.3)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (1:4.2.6.p5+dfsg-3ubuntu2.14.04.10)
Patches:
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