CVE-2020-14367

Publication date 24 August 2020

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

A flaw was found in chrony versions before 3.5.1 when creating the PID file under the /var/run/chrony folder. The file is created during chronyd startup while still running as the root user, and when it's opened for writing, chronyd does not check for an existing symbolic link with the same file name. This flaw allows an attacker with privileged access to create a symlink with the default PID file name pointing to any destination file in the system, resulting in data loss and a denial of service due to the path traversal.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
chrony	24.10 oracular	Fixed 3.5.1-1ubuntu1
	24.04 LTS noble	Fixed 3.5.1-1ubuntu1
	23.10 mantic	Fixed 3.5.1-1ubuntu1
	23.04 lunar	Fixed 3.5.1-1ubuntu1
	22.10 kinetic	Fixed 3.5.1-1ubuntu1
	22.04 LTS jammy	Fixed 3.5.1-1ubuntu1
	21.10 impish	Fixed 3.5.1-1ubuntu1
	21.04 hirsute	Fixed 3.5.1-1ubuntu1
	20.10 groovy	Fixed 3.5.1-1ubuntu1
	20.04 LTS focal	Fixed 3.5-6ubuntu6.2
	18.04 LTS bionic	Fixed 3.2-4ubuntu4.5
	16.04 LTS xenial	Vulnerable
	14.04 LTS trusty	Ignored end of ESM support, was needed

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
chrony	Upstream: util.c? Upstream: main.c? Upstream: https://git.tuxfamily.org/chrony/chrony.git/patch/?id=f00fed20092b6a42283f29c6ee1f58244d74b545

Severity score breakdown

Parameter	Value
Base score	6.0 · Medium
Attack vector	Local
Attack complexity	Low
Privileges required	High
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H

CVE-2020-14367

Cvss 3 Severity Score

Status

Patch details

Severity score breakdown

References

Related Ubuntu Security Notices (USN)

Other references