CVE-2015-1798

Name	CVE-2015-1798
Description	The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 4.x before 4.2.8p2 requires a correct MAC only if the MAC field has a nonzero length, which makes it easier for man-in-the-middle attackers to spoof packets by omitting the MAC.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-192-1, DSA-3223-1
Debian Bugs	782095

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
ntp (PTS)	jessie, jessie (lts)	1:4.2.6.p5+dfsg-7+deb8u3	fixed
	stretch	1:4.2.8p10+dfsg-3+deb9u2	fixed
	buster	1:4.2.8p12+dfsg-4	fixed
	bullseye	1:4.2.8p15+dfsg-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin	Debian Bugs
ntp	source	squeeze	1:4.2.6.p2+dfsg-1+deb6u3	DLA-192-1
ntp	source	wheezy	1:4.2.6.p5+dfsg-2+deb7u4	DSA-3223-1
ntp	source	(unstable)	1:4.2.6.p5+dfsg-6		782095

http://bugs.ntp.org/show_bug.cgi?id=2779
http://support.ntp.org/bin/view/Main/SecurityNotice#ntpd_accepts_unauthenticated_pac