CVE-2022-26788: PowerShell 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:U/RL:O/RC:C

Category

Elevation of Privilege

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2022-Apr

Released

2022-04-12

Last Updated

2022-05-10

EPSS Score

0.38% (percentile: 59.4%)

Affected Products (39)

Windows

• 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 10 Version 21H1 for x64-based Systems
• Windows 10 Version 21H1 for ARM64-based Systems
• Windows 10 Version 21H1 for 32-bit Systems
• Windows Server 2022
• Windows Server 2022 (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 11 version 21H2 for x64-based Systems
• Windows 11 version 21H2 for ARM64-based Systems
• Windows 10 Version 21H2 for 32-bit Systems
• Windows 10 Version 21H2 for ARM64-based Systems
• Windows 10 Version 21H2 for x64-based Systems
• 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 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)

Developer Tools

• PowerShell 7.0
• PowerShell 7.1
• PowerShell 7.2

Security Updates (14)

• 5012647
• 5012591
• 5012599
• 5012604
• 5012592
• 5012653
• 5012596
• 5012670
• 5012639
• 5014012
• 5013999
• 5012650
• 5012666
• Release Notes

Acknowledgments

<a href="https://twitter.com/zashraf1337">Zubair Ashraf</a> with <a href="https://crowdstrike.com/">Crowdstrike</a>, <a href="https://www.linkedin.com/in/firoozakbari/">Firooz Akbari</a> of <a href="https://vmware.com/">VMware</a>, <a href="https://www.linkedin.com/in/matteborg82/">Mattias Borg</a> and <a href="https://www.linkedin.com/in/stefanschorling/">Stefan Schörling</a> with <a href="https://www.onevinn.com/">Onevinn AB</a>

Revision History

• 2022-04-12: Information published.
• 2022-04-27: Revised the Security Updates table to include PowerShell 7.0, PowerShell 7.1, and PowerShell 7.2 because these versions of PowerShell 7 are affected by this vulnerability. See https://github.com/PowerShell/Announcements/issues/31 for more information.
• 2022-05-10: To comprehensively address CVE-2022-26788, Microsoft has released May 2022 security updates for supported editions of Windows 7 and Windows Server 2008 R2. Microsoft strongly recommends that customers enrolled in the Extended Security Update (ESU) program install the updates to be fully protected from the vulnerability.