ZONEALARM SECURITY ADVISORY
Severity: High

Microsoft JScript Remote Code Execution Vulnerability

Date Published : 13 June 2006

Date Last Revised : 13 June 2006

Overview : A remote code execution vulnerability exists in Microsoft JScript. JScript is the Microsoft implementation of the ECMA 262 language specification (ECMAScript Edition 3). JScript is an interpreted, object-based scripting language.

This vulnerability has been classified as "High Risk." Computer users should take appropriate action to patch vulnerable systems.

Description : There is a remote code execution vulnerability in JScript. An attacker could exploit the vulnerability by constructing specially crafted JScript that could potentially allow remote code execution if a user visited a Web site or viewed a specially crafted e-mail message. An attacker who successfully exploited this vulnerability could take complete control of an affected system.

Impact : An attacker could host a Web site that is designed to exploit this vulnerability through Internet Explorer and then persuade a user to view the Web site.

An attack that is successfully exploited would enable an attacker to install malicious code (worm, virus, Trojan horse), read confidential data, or take control over the target system.

Platforms Affected : Please review the Microsoft Security Bulletin MS06023 for a complete list of affected platforms: http://www.microsoft.com/technet/security/bulletin/MS06023.mspx

ZoneAlarm Products That Provide Protection : To ensure the most comprehensive protection, computer users should employ ZoneAlarm Security Suite, or ZoneAlarm Pro. Zone Labs products are not vulnerable to this attack. All Zone Labs security products, including ZoneAlarm, protect the user's system from unauthorized access and intrusions, and alert the user when malicious code attempts to access the network.

Recommended Actions :

ZoneAlarm Family

ZoneAlarm Pro and ZoneAlarm Security Suite protect your system against this vulnerability through "Internet Zone Security" and "Trusted Zone Security". It is recommended that you ensure the following:

  • Internet Zone Security is set to High.
  • Trusted Zone Security is set to Medium.
  • Only trusted hosts are in the 'Trusted' Zone.

Check Point Integrity

Check Point Integrity protects your system against this vulnerability through the following available services:

Classic Firewall Rules

It is recommended that you ensure:

  • Only trusted hosts are in the 'Trusted' Zone.

SmartDefense Program Advisor

SmartDefense Program Advisor automatically blocks malware. It is recommended that you ensure the following:

  • Internet Zone Security is set to High.
  • Trusted Zone Security is set to Medium.

For more information about activating SmartDefense Program Advisor, please refer to CPSA200510.

Advanced Cooperative Enforcement

  • Use Advanced Cooperative Enforcement to enforce policy upon remote endpoints.

Related Resources :

Install Microsoft patches to remove this vulnerability from the Windows Operating System and other software components: http://windowsupdate.microsoft.com

Review Microsoft Security Bulletin MS06023: http://www.microsoft.com/technet/security/Bulletin/MS06-023.mspx

Contact : Zone Labs customers who are concerned about information contained in this advisory or have additional technical questions may reach Zone Labs Technical Support team at: http://www.zonelabs.com/store/content/support/support.jsp. To report security issues with Zone Labs products, contact security@zonelabs.com.

Disclaimer : The information in this advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.

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