Check Point Advisories

Microsoft Excel ExternSheet Record Indexing Memory Corruption (MS09-021; CVE-2009-0558)

Check Point Reference: CPAI-2009-142
Date Published: 9 Jun 2009
Severity: Critical
Last Updated: Tuesday 09 June, 2009
Source:
Industry Reference:CVE-2009-0558
Protection Provided by:

Security Gateway
R81, R80, R77, R75, R71, R70
Who is Vulnerable?
Vulnerability Description Microsoft Excel is a popular spreadsheet application. A remote code execution vulnerability has been identified in the Microsoft Excel. The vulnerability is due to a memory corruption error when Microsoft Excel reads a value from a specially crafted Excel file and then uses it as an index into an array without validation. A remote attacker could trigger this flaw by convincing a victim to open a malformed Excel spreadsheet file. Successful exploitation of this issue may allow the attacker to take complete control of an affected system.

Protection Overview

This protection will detect and block the transferring of malformed Excel files over HTTP.

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 / R71 / R70

  1. In the IPS tab, click Protections and find the Microsoft Excel ExternSheet Record Indexing Memory Corruption (MS09-021) 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 ExternSheet record indexing memory corruption (MS09-021)

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