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Update Protection against Microsoft JScript and VBScript Scripting Engines Information Disclosure Vulnerability (MS11-009)

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Check Point Reference: CPAI-2011-009
Date Published:
Severity:
Source: Microsoft Security Bulletin MS11-009
Industry Reference(s): CVE-2011-0031
Protection Provided by: Security Gateway
  • R75
  • R71
  • R70
VPN-1
  • NGX R65
VSX
  • NGX R65
IPS-1
  • IPS-1
  • IPS-1 NGX R65
Who is Vulnerable?
Jscript 5.8 and VBScript 5.8 on Windows 7 for 32-bit Systems
Jscript 5.8 and VBScript 5.8 on Windows 7 for x64-based Systems
Jscript 5.8 and VBScript 5.8 on Windows Server 2008 R2 for x64-based Systems
Jscript 5.8 and VBScript 5.8 on Windows Server 2008 R2 (Itanium)
Vulnerability Description
An information disclosure vulnerability has been discovered in JScript and VBScript scripting engines. VBScript stands for Microsoft Visual Basic Scripting Edition that includes Web client scripting in Microsoft Internet Explorer and Web server scripting in Microsoft Internet Information Service. JScript is the Microsoft implementation of the ECMA 262 language specification (ECMAScript Edition 3). A remote attacker can exploit this issue to read data not intended to be disclosed.
Update/Patch Available
Apply patches:
Microsoft Security Bulletin MS11-009 
Vulnerability Details
The vulnerability is due to the way that the JScript and VBScript scripting engines process scripts in Web pages. When these scripting engine attempts to load the decoded script into memory in order to run it, a memory corruption can occur. To trigger this issue, an attacker could host a specially crafted Web site that is designed to exploit this vulnerability and then convince a user to visit this Web site. Successful exploitation of this vulnerability will allow the attacker to read data which was not intended to be disclosed.

Protection Overview
This protection will detect and block attempts to exploit this vulnerability. 

In order for the protection to be activated, update your Security Gateway/VPN-1 product to the latest IPS/SmartDefense update. For information on how to update IPS/SmartDefense, 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

How Can I Protect My Network?
1. In the IPS tab, click Protections > By Protocol > IPS Software Blade > Web Intelligence > HTTP Client Protections > Microsoft Internet Explorer Vulnerabilities.
2. In the right pane, double-click the JScript and VBScript Scripting Engines Information Disclosure (MS11-009) 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: Web Client Enforcement Violation
Attack Information: JScript and VBScript scripting engines information disclosure (MS11-009)

Security Gateway: R70/R71

How Can I Protect My Network?
1. In the IPS tab, click Protections > By Protocol > Web Intelligence > HTTP Client Protections > Microsoft Internet Explorer Vulnerabilities.
2. In the right pane, double-click the JScript and VBScript Scripting Engines Information Disclosure (MS11-009) 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: Web Client Enforcement Violation
Attack Information: JScript and VBScript scripting engines information disclosure (MS11-009)

VPN-1 NGX R65 & VSX NGX R65

How Can I Protect My Network?
1. In the SmartDefense tab, click Web Intelligence > HTTP Client Protections > Microsoft Internet Explorer Vulnerabilities > JScript and VBScript Scripting Engines Information Disclosure (MS11-009).
2. In the configuration pane, under Settings > Mode, check Active.
3. Install policy on all modules.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:

Attack Name: Web Client Enforcement Violation
Attack Information: JScript and VBScript scripting engines information disclosure (MS11-009)

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 Web Intelligence > HTML, and select the Internet Explorer protection group.
3. Click JScript and VBScript Scripting Engines Information Disclosure (MS11-009) (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: Internet Explorer Vulnerabilities
Description: JScript and VBScript Scripting Engines Information Disclosure (MS11-0xx)