Update Protection against Microsoft Excel Malformed Chart Sheet Substream Memory Corruption Vulnerability (MS10-038)

Vulnerability
Protection

Check Point Reference:	CPAI-2010-098
Date Published:
Severity:
Last Updated:
Source:	Microsoft Security Bulletin MS10-038
Industry Reference(s):	CVE-2010-0823
Protection Provided by:	Security Gateway R71 R70 VPN-1 NGX R65 VSX NGX R65 IPS-1 IPS-1 IPS-1 NGX R65
Who is Vulnerable? Microsoft Office Excel 2002 SP3 Microsoft Office Excel 2003 SP3 Microsoft Office Excel/Word 2007 SP1 Microsoft Office Excel 2007 SP2 Microsoft Office 2004 for Mac Microsoft Office 2008 for Mac Open XML File Format Converter for Mac Microsoft Office Excel Viewer SP1 Microsoft Office Excel Viewer SP2 Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP2
Vulnerability Description A memory corruption vulnerability has been identified in Microsoft Excel. 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.

Update/Patch Available
Update patches:
Microsoft Security Bulletin MS10-038

Vulnerability Details
The vulnerability is due to the way that Microsoft Office Excel parses malformed chart sheet substreams in the Excel file format when opening a specially crafted Excel file. A remote attacker could trigger this flaw by convincing a victim to open a specially crafted Excel file that includes a malformed substream. 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, 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: R70/R71

How Can I Protect My Network?
1. In the IPS tab, click Protections > By Protocol > Application Intelligence > Content Protection.
2. In the right pane, double-click the Microsoft Excel Malformed Chart Sheet Substream Memory Corruption (MS10-038) protection.
3. In the Protection Details window, click on Edit. Choose the protection's Action (Override IPS Policy with: Prevent/Detect), and apply Additional Settings.
4. 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 malformed chart sheet substream memory corruption (MS10-038)

VPN-1 NGX R65 & VPN-1 VSX NGX R65

How Can I Protect My Network?
1. In the SmartDefense tab, click Application Intelligence > Content Protection.
2. Select the following protection:

Microsoft Excel Malformed Chart Sheet Substream Memory Corruption (MS10-038)

3. In the configuration pane, under Settings > Mode, check Active.
4. Install policy on all modules.

IPS-1 & IPS-1 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 Excel Malformed Chart Sheet Substream Memory Corruption (MS10-038) (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 Excel Malformed Chart Sheet Substream Memory Corruption (MS10-038)

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