Earlier this month, my colleague Cyrill Bannwart and I held two Compass Security Beer Talk presentations in Bern and Jona about Windows Phone 8.1 security. The slides are now online and cover:
- Our (unsuccessful) black box attempts to break out from a Windows perspective
- A review of the implemented security features in Windows Phone 8.1 from a mobile perspective
- Our findings around MDM integration, WiFi Sense and the ability to access low level storage APIs
Phone encryption using BitLocker is only possible through ActiveSync or MDM Policy. An individual will therefore not be able to encrypt his phone (unless he’s really motivated to do so).
WiFi Sense is a controversial new feature of Windows Phone 8.1, announced for the desktop version of Windows 10 as well. It allows you to automatically connect to open WiFi networks around you and may share your WiFi credentials with your Outlook.com, Skype and Facebook friends.
Finally, we were able to bypass the Isolated Storage APIs and use low level storage APIs such as CreateFile2 & CopyFile2 to read and export all files stored on the phone within C:\Windows and its sub folders. Note that we were only able to perform this attack on an unlocked device using side-loaded applications. The abundance of dumped files to analyse (over 880 MB in around 10’000 files) certainly offer further opportunities to explore this system’s security.
Further references about WP 8.1