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CVE-2015-1853

Published: 9 December 2019

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.

From the Ubuntu Security Team

Miroslav Lichvár discovered a head-based buffer overflow in chrony. A remote attacker could use this vulnerability to cause a denial of service (crash) or execute arbitrary code.

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
chrony
Launchpad, Ubuntu, Debian
artful Not vulnerable
(3.1-5)
bionic Not vulnerable
(3.2-4ubuntu1)
cosmic Not vulnerable
(3.2-4ubuntu1)
lucid Ignored
(end of life)
precise Ignored
(end of life)
trusty
Released (1.29-1ubuntu0.1)
upstream
Released (1.31.1)
utopic Ignored
(end of life)
vivid Ignored
(end of life)
wily Ignored
(end of life)
xenial Not vulnerable
(2.1.1-1)
yakkety Ignored
(end of life)
zesty Ignored
(end of life)

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H