CVE-2020-17099: Windows Lock Screen Security Feature Bypass Vulnerability

Overview

Severity

Medium (CVSS 6.8)

CVSS Vector

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Category

Security Feature Bypass

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2020-Dec

Released

2020-12-08

EPSS Score

0.47% (percentile: 64.8%)

FAQ

How could an attacker exploit this vulnerability? An authenticated user would need to lock their active session. An attacker with physical access could then perform actions that would allow them to execute code from the Windows lock screen in the context of the active user session. NOTE: This can only be exploited if a user has already logged in and locked their session.

Affected Products (14)

Windows

• Windows 10 Version 1803 for 32-bit Systems
• Windows 10 Version 1803 for x64-based Systems
• Windows 10 Version 1803 for ARM64-based Systems
• Windows 10 Version 1809 for 32-bit Systems
• Windows 10 Version 1809 for x64-based Systems
• Windows 10 Version 1809 for ARM64-based Systems
• Windows Server 2019
• Windows Server 2019 (Server Core installation)
• Windows 10 for 32-bit Systems
• Windows 10 for x64-based Systems
• Windows 10 Version 1607 for 32-bit Systems
• Windows 10 Version 1607 for x64-based Systems
• Windows Server 2016
• Windows Server 2016 (Server Core installation)

Security Updates (4)

• 4592446
• 4592440
• 4592464
• 4593226

Acknowledgments

Lockheed Martin Red Team

Revision History

• 2020-12-08: Information published.