Check Point Advisories

Microsoft Office Excel Uninitialized Value Buffer Overflow (MS11-021; CVE-2011-0105)

Vulnerability
Protection

Check Point Reference:	CPAI-2011-203
Date Published:	12 Apr 2011
Severity:	High
Last Updated:	Tuesday 29 December, 2015
Source:
Industry Reference:	CVE-2011-0105
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 attacker could exploit this issue via a malformed Excel file. Successful exploitation of this vulnerability may allow execution of arbitrary code on a target system. A memory corruption vulnerability has been identified in Microsoft Excel. The vulnerability is due to a buffer overflow in Microsoft Office Excel that fails to properly initialize a variable that is used as the length of a memcpy operation while parsing a specially crafted Excel file. A remote attacker could trigger this flaw by convincing a victim to open a malicious Office file. 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

In the IPS tab, click Protections and find the Microsoft Office Excel Uninitialized Value Buffer Overflow (MS11-021) protection using the Search tool and Edit the protection's settings.
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 uninitialized value buffer overflow (MS11-021)