CVE-2015-1853

Name	CVE-2015-1853
Description	chrony before 1.31.1 does not properly protect state variables in authenticated symmetric NTP associations, which allows remote attackers with knowledge of NTP peering to cause a denial of service (inability to synchronize) via random timestamps in crafted NTP data packets.
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-193-1, DSA-3222-1
Debian Bugs	782160

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
chrony (PTS)	jessie	1.30-2+deb8u2	fixed
	stretch	3.0-4+deb9u2	fixed
	buster	3.4-4+deb10u2	fixed
	bullseye	4.0-8+deb11u2	fixed
	bookworm	4.3-2+deb12u1	fixed
	sid, trixie	4.6.1-1	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
chrony	source	squeeze	1.24-3+squeeze2	DLA-193-1
chrony	source	wheezy	1.24-3.1+deb7u3	DSA-3222-1
chrony	source	(unstable)	1.30-2		782160

Fix: http://git.tuxfamily.org/chrony/chrony.git/commit/?h=1.31-security&id=d856bd34c4862398411d29200520e3a3b1d4569e