Web APIs in Android through the Lens of Security
This work addresses security vulnerabilities in mobile app web communications, which is critical for protecting users and service providers, though it is incremental in applying static analysis to a known problem.
The study analyzed web communications in Android apps to identify security risks, finding that insecure HTTP connections are seven times more prevalent in closed-source apps and embedded SQL/JavaScript code is used in over 500 apps, exposing billions of users and providers to attacks.
Web communication has become an indispensable characteristic of mobile apps. However, it is not clear what data the apps transmit, to whom, and what consequences such transmissions have. We analyzed the web communications found in mobile apps from the perspective of security. We first manually studied 160 Android apps to identify the commonly-used communication libraries, and to understand how they are used in these apps. We then developed a tool to statically identify web API URLs used in the apps, and restore the JSON data schemas including the type and value of each parameter. We extracted 9,714 distinct web API URLs that were used in 3,376 apps. We found that developers often use the java.net package for network communication, however, third-party libraries like OkHttp are also used in many apps. We discovered that insecure HTTP connections are seven times more prevalent in closed-source than in open-source apps, and that embedded SQL and JavaScript code is used in web communication in more than 500 different apps. This finding is devastating; it leaves billions of users and API service providers vulnerable to attack.