Check Point Advisories

Microsoft Win32k Elevation of Privilege (CVE-2021-41357)

Vulnerability
Protection

Check Point Reference:	CPAI-2021-0738
Date Published:	12 Oct 2021
Severity:	High
Last Updated:	Tuesday 12 October, 2021
Source:	Microsoft CVE-2021-41357
Industry Reference:	CVE-2021-41357
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	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 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 x64-based Systems 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 for x64-based Systems Windows 11 for ARM64-based Systems Windows 11 for 32-bit Systems
Vulnerability Description	An elevation of privilege vulnerability exists in Microsoft Windows. Successful exploitation of this vulnerability could allow a remote attacker to execute arbitrary code on the affected system.

Protection Overview

This protection detects attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R81 / R80 / R77 / R75

In the IPS tab, click Protections and find the Microsoft Win32k Elevation of Privilege (CVE-2021-41357) protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Content Protection Violation.
Attack Information: Microsoft Win32k Elevation of Privilege (CVE-2021-41357)