Check Point Advisories

Microsoft Excel SST Invalid Length Use After Free (MS12-076; CVE-2012-1887)

Vulnerability
Protection

Check Point Reference:	CPAI-2012-802
Date Published:	13 Nov 2012
Severity:	Critical
Last Updated:	Tuesday 13 November, 2012
Source:
Industry Reference:	CVE-2012-1887
Protection Provided by:	Security Gateway R81, R80, R77, R75, R71, R70
Who is Vulnerable?
Vulnerability Description	A remote code execution vulnerability has been reported in Microsoft Excel. The vulnerability is due to an error in Microsoft Excel while handling specially crafted Excel files. A remote attacker could trigger this flaw by convincing a victim to open a specially crafted Excel file. Successful exploitation would allow an attacker to execute arbitrary code on the target.

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

In the IPS tab, click Protections and find the Microsoft Excel SST Invalid Length Use After Free (MS12-076) 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 Excel SST Invalid Length Use After Free (MS12-076)