Check Point Advisories

Microsoft Internet Explorer Out-of-Bounds Write (CVE-2021-33742)

Vulnerability
Protection

Check Point Reference:	CPAI-2021-0485
Date Published:	26 Jul 2021
Severity:	High
Last Updated:	Monday 26 July, 2021
Source:
Industry Reference:	CVE-2021-33742
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Windows 10 20H2 x64, KB5003173 and prior
Vulnerability Description	An out-of-bounds write vulnerability exists in Microsoft Internet Explorer. Successful exploitation of this vulnerability could lead to arbitrary code execution in the context of the affected application.

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 Internet Explorer Out-of-Bounds Write (CVE-2021-33742) 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 Internet Explorer Out-of-Bounds Write (CVE-2021-33742)