CVE-2019-3820

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-02-06 · updated 2026-06-17
Weakness: CWE-285

Description

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.

Affected products

Canonical Ubuntu Linux: 18.04, 18.10
gnome-shell: from 3.15.91 before 3.30.3; from 3.31.0 before 3.31.5 — fixed in 3.30.3, 3.31.5
openSUSE Leap: 15.0, 15.1, 42.3

How to fix

Upgrade to a fixed version: gnome-shell 3.30.3, 3.31.5. Check the vendor advisory for mitigations.

References

http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00023.html
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00049.html
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3820
https://gitlab.gnome.org/GNOME/gnome-shell/issues/851
https://usn.ubuntu.com/3966-1/
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00023.html
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00049.html
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3820
https://gitlab.gnome.org/GNOME/gnome-shell/issues/851
https://usn.ubuntu.com/3966-1/

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