Learn, hack!

URL

https://media.blackhat.com/bh-us-12/Briefings/Tsai/BH_US_12_Tsai_Pan_Exploiting_Windows8_WP.pdf

File name

BH_US_12_Tsai_Pan_Exploiting_Windows8_WP.pdf

File size

2.7 MB

MD5

246dbd53e4a52e5e29306565535f8496

SHA1

5a141d8e8d4e2f9726c9518f2350c215a9bf48f5

Windows 8 introduces lots of security improvements; one of the most interesting features is the Metro-style app. It not only provides fancy user interface, but also a solid application sandbox environment. All Metro-style applications run in AppContainer, and the AppContainer sandbox isolates the execution of each application. It can make sure that an App does not have access to capabilities that it hasn't declared and been granted by the user. This presentation will introduce the design of Metro-style app as well as AppContainer sandbox. We will dive into details of the architecture and see how it works, how does it protect from a malicious App attack. After reviewing the design, we are going to look for possible attack vectors to bypass the sandbox. Analysis will start from low level to high level. We will describe how we find the target to attack, and how we do analyze in different layers, such as debug of APLC, COM server attack, WinRT API fuzzing, and logic flaw discovery. Not only the methodology, we will also demonstrate some problems we have discovered, including tricks to bypass AppContainer to access files, launch program, and connect to Internet.