CVE intelligence and bounded remediation

CVE-2019-3820 — It was discovered that the gnome-shell lock screen since version 3.15.91 did not properly restrict all contextual actions

Medium CVSS 4.8

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.

Severity
Medium
CVSS
4.8 (3.0)
Published
2019-02-06
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-285, CWE-287

Affected products

  • gnome / gnome-shell
  • opensuse / leap / 15.0
  • opensuse / leap / 15.1
  • opensuse / leap / 42.3
  • canonical / ubuntu_linux / 18.04
  • canonical / ubuntu_linux / 18.10

Showing 6 representative product identities from 7 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Authentication bypass and missing authentication

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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