MS13-020  Vulnerability in OLE Automation Could Allow Remote Code Execution

2013-02-12 This security update resolves a privately reported vulnerability in Microsoft Windows Object Linking and Embedding (OLE) Automation. The vulnerability could allow remote code execution if a user opens a specially crafted file. An attacker who successfully exploited the vulnerability could gain the same user rights as the current 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:

OLE Automation Remote Code Execution Vulnerability

A remote code execution vulnerability exists in the way that Object Linking and Embedding (OLE) Automation allocates memory. 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 affected than users who operate with administrative user rights.
CVE-2013-1313

Bulletin details at Microsoft.com