Software Engineering Institute

Microsoft JScript

According to Microsoft Security Bulletin MS06-023:

JScript is the Microsoft implementation of the ECMA 262 language specification (ECMAScript Edition 3). JScript is an interpreted, object-based scripting language. For more information see the product documentation.
The Problem

Microsoft JScript fails to properly release objects allowing in a memory corruption vulnerability to occur. When a specially crafted JScript file, or specially crafted web page containing JScript is accessed, system memory can be corrupted in a way that could allow a remote attacker to execute arbitrary code.

Considerations

For more information refer to Microsoft Security Bulletin MS06-023

A remote, unauthenticated attacker may be able to execute arbitrary code. If the attacked user is running with administrative privileges, the attacker could take complete control of an affected system.

Apply a patch from Microsoft

Microsoft addresses this vulnerability with the updates listed in Microsoft Security Bulletin MS06-023.

Disable Active Scripting

For instructions on how to disable Active Scripting in Microsoft Internet Explorer, please refer to the Internet Explorer section of the Securing Your Web Browser document.

A complete list of workarounds is available in Microsoft Security Bulletin MS06-023.