CVE-2016-1567

Published: 26 January 2016

chrony before 1.31.2 and 2.x before 2.2.1 do not verify peer associations of symmetric keys when authenticating packets, which might allow remote attackers to conduct impersonation attacks via an arbitrary trusted key, aka a "skeleton key."

From the Ubuntu Security Team

Matt Street discovered that chrony doesn't verify peer associations of symmetric keys. A remote attacker could use this vulnerability impersonate another user.

Priority

Cvss 3 Severity Score

8.1

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)
	precise	Ignored (end of life)
	trusty	Released (1.29-1ubuntu0.1)
	upstream	Released (2.2.1, 1.31.2)
	wily	Ignored (end of life)
	xenial	Released (2.1.1-1ubuntu0.1)
	yakkety	Ignored (end of life)
	zesty	Ignored (end of life)
	vivid	Ignored (end of life)
	Patches: upstream: https://git.tuxfamily.org/chrony/chrony.git/commit/?id=a78bf9725a7b481

Severity score breakdown

Parameter	Value
Base score	8.1
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Bugs

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=812923

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