Bug 1669391 (CVE-2019-3820)

Summary:	CVE-2019-3820 gnome-shell: partial lock screen bypass
Product:	[Other] Security Response	Reporter:	Doran Moppert <dmoppert>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	fmuellner, gnome-sig, jadahl, otaylor, security-response-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	gnome-shell 3.31.5, gnome-shell 3.30.3	Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found where the gnome-shell lock screen, since version 3.15.91, does not properly restrict all contextual actions. An attacker with physical access to a locked workstation could invoke certain keyboard shortcuts and potentially other actions. This vulnerability was fixed in gnome-shell 3.31.5 and 3.30.3.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-03-31 22:33:33 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1669393, 1672814, 1672815, 1698520
Bug Blocks:	1669389

Description Doran Moppert 2019-01-25 05:52:45 UTC

It was discovered that the gnome-shell lock screen since version 3.15.91 did not properly restrict all contextual actions.  An attacker with physical access to a locked workstation could invoke certain keyboard shortcuts, and potentially other actions.

This issue was introduced with the following ticket & commit:

https://bugzilla.gnome.org/show_bug.cgi?id=745039
https://gitlab.gnome.org/GNOME/gnome-shell/commit/c79d24b60e773262091023feb6ee1b3deef1c471

Upstream issue:

https://gitlab.gnome.org/GNOME/gnome-shell/issues/851

Comment 4 Doran Moppert 2019-02-06 00:49:51 UTC

External References:

https://gitlab.gnome.org/GNOME/gnome-shell/issues/851

Comment 5 Doran Moppert 2019-02-06 00:50:27 UTC

Created gnome-shell tracking bugs for this issue:

Affects: fedora-all [bug 1672815]

Comment 7 Doran Moppert 2019-02-15 00:30:27 UTC

Acknowledgments:

Name: Ray Strode (The GNOME Project)
Upstream: Maxime Vellard

Comment 8 errata-xmlrpc 2020-03-31 19:12:20 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:1021 https://access.redhat.com/errata/RHSA-2020:1021

Comment 9 Product Security DevOps Team 2020-03-31 22:33:33 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-3820