CVE-2020-17087: Windows Kernel Local Elevation of Privilege Vulnerability

Overview

Severity

High (CVSS 7.8)

CVSS Vector

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

Category

Elevation of Privilege

Exploit Status

Actively Exploited

Exploitation Likelihood

Detected

Publicly Disclosed

Yes

Patch Tuesday

2020-Nov

Released

2020-11-10

Last Updated

2021-01-12

EPSS Score

18.58% (percentile: 95.3%)

CISA KEV

Listed — due 2022-05-03

Known Exploits (2)

• Microsoft Windows Kernel Privilege Escalation Vulnerability — added 2022-08-11T14:33:55Z
• Microsoft Windows Kernel Privilege Escalation Vulnerability — added 2020-11-26T03:21:34Z

Detection & Weaponization (1 sources)

Maturity: Exploit

• GitHub PoC: 4 repositories

Affected Products (44)

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 Version 1909 for 32-bit Systems
• Windows 10 Version 1909 for x64-based Systems
• Windows 10 Version 1909 for ARM64-based Systems
• Windows Server, version 1909 (Server Core installation)
• Windows 10 Version 1903 for 32-bit Systems
• Windows 10 Version 1903 for x64-based Systems
• Windows 10 Version 1903 for ARM64-based Systems
• Windows Server, version 1903 (Server Core installation)
• Windows 10 Version 2004 for 32-bit Systems
• Windows 10 Version 2004 for ARM64-based Systems
• Windows 10 Version 2004 for x64-based Systems
• Windows Server, version 2004 (Server Core installation)
• Windows 10 Version 20H2 for 32-bit Systems
• Windows 10 Version 20H2 for ARM64-based Systems
• Windows Server, version 20H2 (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)
• Windows 8.1 for 32-bit systems
• Windows 8.1 for x64-based systems
• Windows RT 8.1

ESU

• Windows 7 for 32-bit Systems Service Pack 1
• Windows 7 for x64-based Systems Service Pack 1
• Windows Server 2008 for 32-bit Systems Service Pack 2
• Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
• Windows Server 2008 for x64-based Systems Service Pack 2
• Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
• Windows Server 2008 R2 for x64-based Systems Service Pack 1
• Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
• Windows Server 2012
• Windows Server 2012 (Server Core installation)
• Windows Server 2012 R2
• Windows Server 2012 R2 (Server Core installation)

Security Updates (14)

• 4586785
• 4586793
• 4586786
• 4586781
• 4586787
• 4586830
• 4586827
• 4586805
• 4586845
• 4586823
• 4586807
• 4586817
• 4598278
• 4598297

Acknowledgments

Microsoft would like to thank Qualys for co-ordinated vulnerability disclosure on identifying a regression for the Windows Server 2012 version of this security update., Mateusz Jurczyk and Sergei Glazunov of Google Project Zero

Revision History

• 2020-11-10: Information published.
• 2021-01-12: To comprehensively address CVE-2020-17087 for supported editions of Windows Server 2012, Microsoft is releasing security updates 4598278 (Monthly Rollup) and 4598297 (Security Only). We recommend that customers running Windows Server 2012 install the appropriate January 2021 update to be fully protected from this vulnerability.