ubuntu-cve-2021-20315
Vulnerability from osv_ubuntu
Published
2022-02-18 18:15
Modified
2025-08-01 04:53
Summary
Details

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.

Severity
6.1 (Medium)
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "gnome-shell",
        "purl": "pkg:deb/ubuntu/gnome-shell@3.18.5-0ubuntu0.3+esm1?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.16.4-0ubuntu1",
        "3.18.1-1ubuntu1",
        "3.18.2-0ubuntu1",
        "3.18.2-0ubuntu2",
        "3.18.3-3ubuntu1",
        "3.18.4-0ubuntu1",
        "3.18.4-0ubuntu2",
        "3.18.4-0ubuntu3",
        "3.18.5-0ubuntu0.1",
        "3.18.5-0ubuntu0.2",
        "3.18.5-0ubuntu0.3",
        "3.18.5-0ubuntu0.3+esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "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.",
  "id": "UBUNTU-CVE-2021-20315",
  "modified": "2025-08-01T04:53:00Z",
  "published": "2022-02-18T18:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-20315"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2006285"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-20315"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-20315"
  ],
  "withdrawn": "2025-08-01T19:37:46Z"
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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