CVE-2021-3560

Publication date 3 June 2021

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

It was found that polkit could be tricked into bypassing the credential checks for D-Bus requests, elevating the privileges of the requestor to the root user. This flaw could be used by an unprivileged local attacker to, for example, create a new local administrator. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
policykit-1	22.04 LTS jammy	Fixed 0.105-31
	21.10 impish	Fixed 0.105-31
	21.04 hirsute	Fixed 0.105-30ubuntu0.1
	20.10 groovy	Fixed 0.105-29ubuntu0.1
	20.04 LTS focal	Fixed 0.105-26ubuntu1.1
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

mdeslaur

commit introducing issue was backported to policykit-1 version in Ubuntu in focal+

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-4980-1
polkit vulnerability
3 June 2021