Check Point Advisories

Microsoft Word Heap Overflow (CVE-2023-21716)

Vulnerability
Protection

Check Point Reference:	CPAI-2023-0158
Date Published:	18 Apr 2023
Severity:	Critical
Last Updated:	Tuesday 18 April, 2023
Source:
Industry Reference:	CVE-2023-21716
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Microsoft Office 2019 macOS Microsoft Office long term servicing channel 2021 macOS Microsoft Office online server 2016 Microsoft Office web apps 2013 sp1 Microsoft SharePoint enterprise server 2013 sp1 Microsoft SharePoint enterprise server 2016 Microsoft SharePoint foundation 2013 sp1 Microsoft SharePoint server subscription Microsoft SharePoint server language pack subscription Microsoft SharePoint server 2019 Microsoft Word 2013 sp1 Microsoft Word 2013 sp1 rt
Vulnerability Description	A heap overflow vulnerability exists in Microsoft Word. Successful exploitation of this vulnerability could allow a remote attacker to execute arbitrary code on the affected system or cause application crashes.

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 Word Heap Overflow (CVE-2023-21716) 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 Word Heap Overflow (CVE-2023-21716)