Check Point Advisories

Microsoft Windows Secure Channel Denial of Service (CVE-2023-21819)

Vulnerability
Protection

Check Point Reference:	CPAI-2023-0078
Date Published:	14 Feb 2023
Severity:	High
Last Updated:	Tuesday 14 February, 2023
Source:	Microsoft CVE-2023-21819
Industry Reference:	CVE-2023-21819
Protection Provided by:	Security Gateway R81, R80
Who is Vulnerable?	Microsoft Windows 10 Version 1809 for 32-bit Systems Microsoft Windows 10 Version 1809 for x64-based Systems Microsoft Windows 10 Version 1809 for ARM64-based Systems Microsoft Windows Server 2019 Microsoft Windows Server 2019 (Server Core installation) Microsoft Windows Server 2022 Microsoft Windows Server 2022 (Server Core installation) Microsoft Windows 10 Version 20H2 for x64-based Systems Microsoft Windows 10 Version 20H2 for 32-bit Systems Microsoft Windows 10 Version 20H2 for ARM64-based Systems Microsoft Windows 11 version 21H2 for x64-based Systems Microsoft Windows 11 version 21H2 for ARM64-based Systems Microsoft Windows 10 Version 21H2 for 32-bit Systems Microsoft Windows 10 Version 21H2 for ARM64-based Systems Microsoft Windows 10 Version 21H2 for x64-based Systems Microsoft Windows 10 Version 22H2 for x64-based Systems Microsoft Windows 10 Version 22H2 for ARM64-based Systems Microsoft Windows 10 Version 22H2 for 32-bit Systems
Vulnerability Description	A denial of service vulnerability exists in Microsoft Windows Secure Channel. Successful exploitation of this vulnerability would allow a remote attacker to create a denial of service condition 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 R80

In the IPS tab, click Protections and find the Microsoft Windows Secure Channel Denial of Service (CVE-2023-21819) 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: Windows SMB Protection Violation.
Attack Information: Microsoft Windows Secure Channel Denial of Service (CVE-2023-21819)