Check Point Advisories

Microsoft Excel VBA Module Stream Use-After-Free

Vulnerability
Protection

Check Point Reference:	CPAI-2012-109
Date Published:	26 Mar 2012
Severity:	High
Last Updated:	Thursday 18 April, 2024
Source:
Protection Provided by:	Security Gateway R75
Who is Vulnerable?	Microsoft Office 2003 Microsoft Office 2007 Microsoft Office 2010
Vulnerability Description	A use-after-free vulnerability has been reported in Microsoft Excel.
Vulnerability Details	The vulnerability is due to an error in Excel while handling malformed VBA module streams in Excel files. A remote attacker may exploit this issue by enticing a user to open a specially crafted Excel file and then perform certain actions. Successful exploitation will allow an attacker to execute arbitrary code in the security context of the logged-on user.

Protection Overview

This protection will detect and block malformed Excel files.

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

Security Gateway R75 / R71 / R70

In the IPS tab, click Protections and find the Microsoft Excel VBA Module Stream Use-After-Free protection using the Search tool and Edit the protection's settings.
Install policy on all modules.

SmartView Tracker will log the following entries:
Attack Name: Content Protection Violation
Attack Information: Microsoft Excel VBA module stream use-after-free