Check Point Advisories

Microsoft Excel Malformed FNGROUPCOUNT Value Code Execution (MS06-037; CVE-2006-1308)

Check Point Reference: CPAI-2006-267
Date Published: 9 May 2010
Severity: High
Last Updated: Sunday 09 May, 2010
Source:
Industry Reference:CVE-2006-1308
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description Microsoft Excel is a popular spreadsheet application that is usually released as part of the Microsoft Office suite. The application can create complex spreadsheets with multiple workbooks, formulae, and various data sources. The proprietary file format used for storing Microsoft Excel documents is known as the Binary Interchange File Format (BIFF), with different versions of the application supporting different versions of the format. The common extension used for Microsoft Excel documents is .xls. There exists a code execution vulnerability in Microsoft Excel. The flaw is caused by an insufficient check of a malformed FNGROUPCOUNT record in an Excel file. An attacker can exploit this vulnerability to inject and execute arbitrary code in the security context of the currently logged in user. In case of an attack where code injection is not successful, the Microsoft Excel application will terminate. This can potentially lead to a loss of data. In case of an attack where code injection and execution is successful, the behavior of the target is entirely dependent on the intended function of the injected code. The code in such a case would execute within the security context of the current user.

Protection Overview

This protection will detect and block 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 / R77 / R75

  1. In the IPS tab, click Protections and find the Microsoft Excel Malformed FNGROUPCOUNT Value Code Execution (MS06-037) protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  Content Protection Violation.
Attack Information:  Microsoft Excel malformed FNGROUPCOUNT value code execution (MS06-037)

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