XPC (X-code Parking Commission) is a high-level inter-process communication (IPC) technology that is widely used by macOS and iOS applications to communicate and share data while maintaining security and isolation.
XPC is particularly useful for enabling secure and efficient communication between sandboxed applications and privileged services, making it a popular choice for macOS developers, but it does come with several vulnerabilities.
The article does not go into these vulnerabilities but mentions that static and dynamic analysis tools can be used to identify and exploit them.
Static analysis of multiple components is required, as well as dynamic analysis, such as monitoring requests and responses between the XPC server and client in real-time, and using Frida to hook into the XPC server application and capture protocol and method information whenever an application receives an XPC connection request.
This provides insight into the transmitted data and understands how it is transmitted, allowing for the creation of a simple XPC client application as an attacker to send an XPC connection.