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

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Check Point Reference: CPAI-2012-802
Date Published:
Severity:
Source: Microsoft Security Bulletin MS12-076
Industry Reference(s): CVE-2012-1887
Protection Provided by: Security Gateway
  • R70
  • R71
  • R75
Who is Vulnerable?
Microsoft Excel 2003 Service Pack 3
Microsoft Excel 2007 Service Pack 2
Microsoft Excel 2007 Service Pack 3
Microsoft Excel 2010 Service Pack 1 (32-bit editions)
Microsoft Excel 2010 Service Pack 1 (64-bit editions)
Microsoft Office for Mac
Microsoft Office 2008 for Mac
Microsoft Office for Mac 2011
Vulnerability Description
A remote code execution vulnerability has been reported in Microsoft Excel.
Update/Patch Available
Apply patches from: MS12-076
Vulnerability Details
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, Protection tab and select the version of your choice.

To configure the defense, select your product from the list below and follow the related protection steps.

Security Gateway R75 / R71 / R70

How Can I Protect My Network?

  1. 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.
  2. Install policy on all modules.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:
Attack Name: Content Protection Violation
Attack Information: Microsoft Excel SST Invalid Length Use After Free (MS12-076)