MS13-099  Vulnerability in Microsoft Scripting Runtime Object Library Could Allow Remote Code Execution

2013-12-10 This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability could allow remote code execution if an attacker convinces a user to visit a specially crafted website or a website that hosts specially crafted content. An attacker who successfully exploited this vulnerability could gain the same user rights as the local user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
Vulnerabilities addressed in this bulletin:

Use-After-Free Vulnerability in Microsoft Scripting Runtime Object Library

This is a remote code execution vulnerability in the Microsoft Scripting Runtime Object Library. An attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
CVE-2013-5056

Bulletin details at Microsoft.com