Yong Chuan Koh presented this talk at Microsoft BlueHat v17.
The MS Office Protected-View is unlike any other sandboxes; it aims to provide only a text-view of the document contents and therefore does not have to provide full functionalities of the application. As a result, the broker -sandbox Inter-Process Communication (IPC) attack surface is greatly reduced. However this does not mean there are no vulnerabilities. This talk discussed the methodology for fuzzing this IPC attack surface, from the test-case generation to the discovery and analysis of CVE-2017-8502 and CVE-2017-8692.