CVE-2019-3843

Publication date 26 April 2019

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

It was discovered that a systemd service that uses DynamicUser property can create a SUID/SGID binary that would be allowed to run as the transient service UID/GID even after the service is terminated. A local attacker may use this flaw to access resources that will be owned by a potentially different service in the future, when the UID/GID will be recycled.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
systemd	19.10 eoan	Not affected
	19.04 disco	Ignored end of life
	18.10 cosmic	Ignored end of life
	18.04 LTS bionic	Fixed 237-3ubuntu10.38
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Patch details

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

Package	Patch details
systemd	Upstream: 3c27973 Upstream: f69567c Upstream: 9d880b7 Upstream: 7445db6 Upstream: 62aa292 Upstream: bf65b7e Upstream: 9e6e543 Upstream: 3c27973 Upstream: 167fc10 Upstream: f69567c Upstream: 9d880b7 Upstream: 7445db6 Upstream: 62aa292 Upstream: bf65b7e

Severity score breakdown

Parameter	Value
Base score	7.8 · High
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-4269-1
systemd vulnerabilities
5 February 2020