Staying Safe in Times of Cyber Uncertainty
Check Point Advisories

Microsoft Office Excel SupBook Record Linked List Corruption (MS11-021; CVE-2011-0979)

Check Point Reference: CPAI-2011-222
Date Published: 3 Apr 2011
Severity: High
Last Updated: Sunday 13 December, 2015
Industry Reference:CVE-2011-0979
Protection Provided by:

Security Gateway
R81, R80, R77, R75, R71, R70, R65

Who is Vulnerable?
Vulnerability Description Microsoft Excel is a popular spreadsheet application. A remote code execution vulnerability has been identified in Microsoft Excel. The vulnerability is due to an error in Microsoft Office Excel that fails to properly manage the members of a data structure while parsing a specially crafted Excel file. A remote attacker could trigger this flaw by convincing a victim to open a malicious Office file that contains a malformed SupBook record. Successful exploitation of this issue may allow execution of arbitrary code on a vulnerable 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 / R65

  1. In the IPS tab, click Protections and find the Microsoft Office Excel SupBook Record Linked List Corruption (MS11-021) 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 Office Excel SupBook record linked list corruption (MS11-021)

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