CVE-2019-3820 Auth bypass in gnome-shell
Medium 4.8
Published
Updated
Check this codebase for CVE-2019-3820 and fix it if it is affected.
What it is: CVE-2019-3820 is a medium-severity authentication bypass vulnerability in Canonical Ubuntu Linux, published on 6 Feb 2019. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2019-3820 in the wild and no public exploit code.
Affected product: Canonical Ubuntu Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2019-3820/ (Markdown: https://insights.sbomify.com/CVE-2019-3820/index.md)
An attacker with physical access to a locked GNOME workstation can bypass lock screen restrictions to invoke keyboard shortcuts and other actions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2019-3820?
CVE-2019-3820 is a medium-severity authentication bypass vulnerability in Canonical Ubuntu Linux, published on 6 Feb 2019. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2019-3820?
It affects 3 products.
Linux distribution packages (40)
LibRaw Red Hat:enterprise_linux:7::client | All versions | 0:0.19.4-1.el7 |
LibRaw-debuginfo Red Hat:enterprise_linux:7::client | All versions | 0:0.19.4-1.el7 |
LibRaw-devel Red Hat:enterprise_linux:7::client | All versions | 0:0.19.4-1.el7 |
LibRaw-static Red Hat:enterprise_linux:7::client | All versions | 0:0.19.4-1.el7 |
accountsservice Red Hat:enterprise_linux:7::client | All versions | 0:0.6.50-7.el7 |
accountsservice-debuginfo Red Hat:enterprise_linux:7::client | All versions | 0:0.6.50-7.el7 |
accountsservice-devel Red Hat:enterprise_linux:7::client | All versions | 0:0.6.50-7.el7 |
accountsservice-libs Red Hat:enterprise_linux:7::client | All versions | 0:0.6.50-7.el7 |
colord Red Hat:enterprise_linux:7::client | All versions | 0:1.3.4-2.el7 |
colord-debuginfo Red Hat:enterprise_linux:7::client | All versions | 0:1.3.4-2.el7 |
colord-devel Red Hat:enterprise_linux:7::client | All versions | 0:1.3.4-2.el7 |
colord-devel-docs Red Hat:enterprise_linux:7::client | All versions | 0:1.3.4-2.el7 |
colord-extra-profiles Red Hat:enterprise_linux:7::client | All versions | 0:1.3.4-2.el7 |
colord-libs Red Hat:enterprise_linux:7::client | All versions | 0:1.3.4-2.el7 |
control-center Red Hat:enterprise_linux:7::client | All versions | 1:3.28.1-6.el7 |
control-center-debuginfo Red Hat:enterprise_linux:7::client | All versions | 1:3.28.1-6.el7 |
control-center-filesystem Red Hat:enterprise_linux:7::client | All versions | 1:3.28.1-6.el7 |
gdm Red Hat:enterprise_linux:7::client | All versions | 1:3.28.2-22.el7 |
gdm-debuginfo Red Hat:enterprise_linux:7::client | All versions | 1:3.28.2-22.el7 |
gdm-devel Red Hat:enterprise_linux:7::client | All versions | 1:3.28.2-22.el7 |
gdm-pam-extensions-devel Red Hat:enterprise_linux:7::client | All versions | 1:3.28.2-22.el7 |
gnome-classic-session Red Hat:enterprise_linux:7::client | All versions | 0:3.28.1-11.el7 |
gnome-online-accounts Red Hat:enterprise_linux:7::client | All versions | 0:3.28.2-1.el7 |
gnome-online-accounts-debuginfo Red Hat:enterprise_linux:7::client | All versions | 0:3.28.2-1.el7 |
gnome-online-accounts-devel Red Hat:enterprise_linux:7::client | All versions | 0:3.28.2-1.el7 |
gnome-settings-daemon Red Hat:enterprise_linux:7::client | All versions | 0:3.28.1-8.el7 |
gnome-settings-daemon-debuginfo Red Hat:enterprise_linux:7::client | All versions | 0:3.28.1-8.el7 |
gnome-settings-daemon-devel Red Hat:enterprise_linux:7::client | All versions | 0:3.28.1-8.el7 |
gnome-shell Red Hat:enterprise_linux:7::client | All versions | 0:3.28.3-24.el7 |
gnome-shell-debuginfo Red Hat:enterprise_linux:7::client | All versions | 0:3.28.3-24.el7 |
gnome-shell-extension-alternate-tab Red Hat:enterprise_linux:7::client | All versions | 0:3.28.1-11.el7 |
gnome-shell-extension-apps-menu Red Hat:enterprise_linux:7::client | All versions | 0:3.28.1-11.el7 |
gnome-shell-extension-auto-move-windows Red Hat:enterprise_linux:7::client | All versions | 0:3.28.1-11.el7 |
gnome-shell-extension-common Red Hat:enterprise_linux:7::client | All versions | 0:3.28.1-11.el7 |
gnome-shell-extension-dash-to-dock Red Hat:enterprise_linux:7::client | All versions | 0:3.28.1-11.el7 |
gnome-shell-extension-disable-screenshield Red Hat:enterprise_linux:7::client | All versions | 0:3.28.1-11.el7 |
gnome-shell-extension-drive-menu Red Hat:enterprise_linux:7::client | All versions | 0:3.28.1-11.el7 |
gnome-shell-extension-extra-osk-keys Red Hat:enterprise_linux:7::client | All versions | 0:3.28.1-11.el7 |
gnome-shell-extension-horizontal-workspaces Red Hat:enterprise_linux:7::client | All versions | 0:3.28.1-11.el7 |
gnome-shell-extension-launch-new-instance Red Hat:enterprise_linux:7::client | All versions | 0:3.28.1-11.el7 |
Products include Canonical Ubuntu Linux, Gnome Gnome-Shell, Opensuse Leap.
How do I fix CVE-2019-3820?
Apply the vendor's patch.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2019-3820 being exploited?
There is no known exploitation of CVE-2019-3820 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as CLEANSTART-2024-BU71046, DEBIAN-CVE-2019-3820, GHSA-jh4v-7q79-jf56, OESA-2021-1403, RHSA-2020:1021, SUSE-SU-2019:1390-1 and 4 more.