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CVE-2021-20315

Published: 18 February 2022

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.

Notes

AuthorNote
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

Priority

Medium

Cvss 3 Severity Score

6.1

Score breakdown

Status

Package Release Status
gnome-shell
Launchpad, Ubuntu, Debian
bionic Not vulnerable

focal Not vulnerable

hirsute Not vulnerable

trusty Does not exist

upstream Needs triage

xenial Ignored
(end of standard support)

Severity score breakdown

Parameter Value
Base score 6.1
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