This update resolves vulnerabilities in Microsoft SQL Server that could allow remote code execution if an authenticated attacker runs a specially crafted query that is designed to execute a virtual function from a wrong address. This leads to a function call to uninitialized memory. To learn more about the vulnerabilities, see Microsoft Security Bulletin MS15-058.
An instance of SQL Server 2012 Service Pack 1 that has the Master Data Services (MDS) component installed but does not have the SQL Engine component installed may not discover this security update from Microsoft Update.
How to obtain and install the update
Method 1: Microsoft Update
This update is available through Microsoft Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to turn on automatic updating, see Get security updates automatically.
Method 2: Microsoft Download Center
You can obtain the stand-alone update package through the Microsoft Download Center. To install the update, follow the installation instructions on the download page.