CVE-2021-20315

Publication date 18 February 2022

Last updated 24 July 2024


Ubuntu priority

Cvss 3 Severity Score

6.1 · Medium

Score breakdown

A locking protection bypass flaw was found in some versions of gnome-shell as shipped within CentOS Stream 8, when the "Application menu" or "Window list" GNOME extensions are enabled. This flaw allows a physical attacker who has access to a locked system to kill existing applications and start new ones as the locked user, even if the session is still locked.

Read the notes from the security team

Status

Package Ubuntu Release Status
gnome-shell 21.04 hirsute
Not affected
20.04 LTS focal
Not affected
18.04 LTS bionic
Not affected
16.04 LTS xenial Ignored end of standard support
14.04 LTS trusty Not in release

Notes


alexmurray

This issue was specific to Centos 8 Stream, in particular as a result of the backport done in https://bugzilla.redhat.com/show_bug.cgi?id=1651378 so does not affect gnome-shell as packaged in Ubuntu

Severity score breakdown

Parameter Value
Base score 6.1 · Medium
Attack vector Physical
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H