A zero-day vulnerability in Windows has been disclosed affecting all supported releases of Windows. The vulnerability is triggered when a user is forced to open a PowerPoint files containing a malicious Object Linking and Embedding (OLE) object. OLE technology is most commonly used by Microsoft Office for embedding data from, for example, an Excel spreadsheet in a Word document. Microsoft has released a Fix it “OLE packager Shim Workaround” which will stop the known PowerPoint attacks but it is not capable to stop other attacks that might be built to exploit this vulnerability.
Source: https://thehackernews.com/2014/10/microsoft-powerpoint-vulnerable-to-zero.html