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Microsoft Excel Memory Heap Overwrite Vulnerability (MS11-045; CVE-2011-1275)

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Check Point Reference: CPAI-2011-286
Date Published:
Severity:
Last Updated:
Source: Microsoft Security Bulletin MS11-045
Industry Reference(s): CVE-2011-1275
Protection Provided by: Security Gateway
  • R75
  • R71
  • R70
VPN-1
  • NGX R65
IPS-1
  • IPS-1
  • IPS-1 NGX R65
Who is Vulnerable?
Microsoft Excel 2002 Service Pack 3
Microsoft Office 2004 for Mac
Microsoft Office 2008 for Mac
Microsoft Office for Mac 2011
Open XML File Format Converter for Mac
Vulnerability Description
A remote code execution vulnerability exists in the way that Microsoft Excel handles specially crafted Excel files. An attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
Vulnerability Details
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. An attacker could then install programs; 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

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

Security Gateway R70 / R71 / R75

How Can I Protect My Network?

  1. In the IPS tab, click Protections and find the Microsoft Excel Memory Heap Overwrite Vulnerability (MS11-045) protection using the Search tool
  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 Memory Heap Overwrite Vulnerability (MS11-045)

IPS-1 & IPS1-NGX R65

How Can I Protect My Network?
1. In the IPS-1 Policy Manager, click on the Protection tab.
2. In the Protection tree, click Application Intelligence > Badfiles, and select the Microsoft Office Parser protection group.
3. Click Microsoft Office Excel Scenario Record Buffer Overflow (MS11-045) (IPS-1 NGX R65 only).
4. In the configuration pane, under Settings, check Active.
5. Click on Install Policy.

How Do I Know if My Network is Under Attack?

Upon attack, the following entries will be logged:

Alert Name: Vulnerability in MS-Office file
Description: Microsoft Office Excel Scenario Record Buffer Overflow (MS11-045)