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CVE

CVE-2021-20315

A locking protection bypass flaw was found in some versions of gnome-shell as shipped within CentOS Stream 8, when the "

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.

MEDIUM · CVSS 6.1 EPSS 0.00029
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules7 YARA rules0
⬡

Weakness Classification

CWE-667Improper Locking
CWE-667Improper Locking
▤

Affected Products & Versions

2
gnome gnome-shell< 3.32.2
centos streamall versions
◈

Sigma Hunt Rules

7
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighNTFS Alternate Data Stream
producthighExports Registry Key To an Alternate Data Stream
producthighHackTool Named File Stream Created
producthighSuspicious File Download From File Sharing Websites - File Stream
producthighRun PowerShell Script from Redirected Input Stream
productmediumPowershell Store File In Alternate Data Stream
▣

Scoring & Timeline

6.1
MEDIUM · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD18 Feb 2022 · 06:15 PM
CVSS VectorCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://bugzilla.redhat.com/show_bug.cgi?id=2006285Issue TrackingThird Party Advisory
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