Check Point Advisories

Microsoft Excel Series Integer Underflow (MS11-045; CVE-2011-1278)

Check Point Reference: CPAI-2011-293
Date Published: 14 Jun 2011
Severity: High
Last Updated: Tuesday 14 June, 2011
Source:
Industry Reference:CVE-2011-1278
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 vulnerability has been identified in Microsoft Excel. When Microsoft Excel validates record information upon opening a specially crafted Excel file, a memory handling error may corrupt system memory in such a way that an attacker could execute arbitrary code. An attacker who successfully exploited this vulnerability could take complete control of an affected system remotely. An attacker could then install programs or view, change, or delete data; or create new accounts with full user rights.

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 Excel Series Integer Underflow (MS11-045) 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 series integer underflow (MS11-045)

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