Check Point Advisories

Microsoft Office Excel Out-of-Bounds Write (CVE-2023-33133)

Vulnerability
Protection

Check Point Reference:	CPAI-2023-1408
Date Published:	26 Dec 2023
Severity:	High
Last Updated:	Tuesday 26 December, 2023
Source:
Industry Reference:	CVE-2023-33133
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Microsoft 365 Apps Enterprise Edition on X64 Microsoft 365 Apps Enterprise Edition on X86 Microsoft Excel 2013 Service Pack 1 on x64 Microsoft Excel 2013 Service Pack 1 on x86 Microsoft Excel 2013 Service Pack 1 Runtime Edition Microsoft Excel 2016 on x64 Microsoft Excel 2016 on x86 Microsoft Office Long Term Servicing Channel 2021 on X64 Microsoft Office Long Term Servicing Channel (LTSC) 2021 on x86 Microsoft Office Long Term Servicing Channel (LTSC) 2021 for MacOS Microsoft Office Online Server
Vulnerability Description	An out-of-bounds write vulnerability exists in Microsoft Office Excel. Successful exploitation would result in a denial of service condition.

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 Office Excel Out-of-Bounds Write (CVE-2023-33133) 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 Office Excel Out-of-Bounds Write (CVE-2023-33133)