Medusa by Dimitrios Valsamaras: A Game-Changer for Mobile Bug Hunters

2025-02-13

Medusa, developed by Dimitrios Valsamaras, is revolutionizing the field of mobile bug hunting. Powered by FRIDA, this framework automates critical tasks such as bypassing SSL pinning, tracing function calls, and modifying app behavior in real-time. It is an indispensable tool for uncovering vulnerabilities in both Android and iOS applications.

Key Features of Medusa:

  • Automated SSL Pinning Bypass: Medusa simplifies the process of bypassing SSL pinning, a common security measure in mobile apps.
  • Function Call Tracing: Easily trace and analyze function calls within the app.
  • Real-Time App Behavior Modification: Modify app behavior on the fly to test for vulnerabilities.

Practice-Verified Commands and Codes:

1. Installing FRIDA:

pip install frida-tools

2. Running Medusa with FRIDA:

frida -U -n com.example.app -l medusa.js

3. Bypassing SSL Pinning:

[javascript]
Java.perform(function () {
var X509TrustManager = Java.use(‘javax.net.ssl.X509TrustManager’);
var TrustManagerImpl = Java.use(‘com.android.org.conscrypt.TrustManagerImpl’);

X509TrustManager.checkServerTrusted.implementation = function (chain, authType) {
console.log(“Bypassing SSL Pinning”);
return;
};

TrustManagerImpl.verifyChain.implementation = function (untrustedChain, trustAnchorChain, host, clientAuth, ocspData, tlsSctData) {
console.log(“Bypassing SSL Pinning”);
return untrustedChain;
};
});
[/javascript]

4. Tracing Function Calls:

[javascript]
Java.perform(function () {
var targetClass = Java.use(‘com.example.app.TargetClass’);
targetClass.targetMethod.implementation = function () {
console.log(“TargetMethod called”);
return this.targetMethod.apply(this, arguments);
};
});
[/javascript]

What Undercode Say:

Medusa is a powerful tool for mobile bug hunters, offering a range of features that streamline the process of uncovering vulnerabilities in mobile applications. By automating tasks such as SSL pinning bypass and function call tracing, Medusa allows security researchers to focus on identifying and exploiting vulnerabilities rather than getting bogged down by repetitive tasks.

The integration with FRIDA provides a robust framework for dynamic analysis, making it easier to modify app behavior in real-time. This is particularly useful for testing the security of mobile applications, as it allows researchers to see how an app responds to various inputs and modifications.

In addition to the commands and codes provided, here are some additional Linux and Windows commands that can be useful for mobile bug hunting:

  • Linux:
    adb devices # List connected devices
    adb shell # Open a shell on the device
    adb logcat # View device logs
    

  • Windows:
    [cmd]
    adb devices # List connected devices
    adb shell # Open a shell on the device
    adb logcat # View device logs
    [/cmd]

For further reading and resources, check out the following URLs:
FRIDA Documentation
Medusa GitHub Repository

Medusa is a must-have tool for anyone involved in mobile security research. Its powerful features and ease of use make it an essential addition to any bug hunter’s toolkit. Whether you’re a seasoned professional or just starting out, Medusa can help you uncover vulnerabilities and improve the security of mobile applications.

Conclusion:

Medusa by Dimitrios Valsamaras is a game-changer in the field of mobile bug hunting. Its FRIDA-powered framework automates critical tasks, making it easier for researchers to uncover vulnerabilities in Android and iOS applications. By providing tools for SSL pinning bypass, function call tracing, and real-time app behavior modification, Medusa streamlines the bug hunting process and allows researchers to focus on identifying and exploiting vulnerabilities.

The practice-verified commands and codes provided in this article offer a starting point for using Medusa in your own security research. Additionally, the Linux and Windows commands can help you interact with mobile devices and view logs, further enhancing your ability to uncover vulnerabilities.

For more information and resources, be sure to check out the FRIDA documentation and the Medusa GitHub repository. With its powerful features and ease of use, Medusa is an essential tool for any mobile bug hunter.

References:

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