Check Point Advisories

JScript Scripting Engine Web Pages Decoding Code Execution (MS09-045; CVE-2009-1920)

Check Point Reference: CPAI-2009-181
Date Published: 8 Sep 2009
Severity: Critical
Last Updated: Wednesday 08 May, 2013
Source:
Industry Reference:CVE-2009-1920
Protection Provided by:

Security Gateway
R81, R80, R77, R75, R71, R70, R65

Who is Vulnerable?
Vulnerability Description JScript is an interpreted, object-based scripting language that is often used to make Web sites more flexible or interactive. A remote code execution vulnerability has been reported in the way that the JScript scripting engine decodes script in Web pages. The vulnerability is due to a memory corruption error in the JScript scripting engine when it attempts to load the decoded script into memory in order to run it. A remote attacker could exploit this issue by convincing a user to visit a malicious Web page. Successful exploitation of this issue may lead to a crash in Internet Explorer and may allow remote code execution on the affected system.

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 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 / R65

  1. In the IPS tab, click Protections and find the JScript Scripting Engine Web Pages Decoding Code Execution (MS09-045) protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  Web Client Enforcement Violation.
Attack Information:  JScript Scripting Engine web pages decoding code execution (MS09-045)

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