allsafe v1.4 releases: Intentionally vulnerable Android application

by do son · Published March 16, 2021 · Updated May 2, 2021

Allsafe

Allsafe is an intentionally vulnerable application that contains various vulnerabilities. Unlike other vulnerable Android apps, this one is less like a CTF and more like a real-life application that uses modern libraries and technologies. Additionally, I have included some Frida-based challenges for you to explore. Have fun and happy hacking!

Tasks / Vulnerabilities

1. Insecure Logging

Simple information disclosure vulnerability. Use the logcat command-line tool to discover sensitive information.

2. Hardcoded Credentials

Some credentials are left in the code. Your task is to reverse engineer the app and find sensitive information.

3. Root Detection

This is purely for Frida practice. Make the code believe that your device is not rooted!

4. Arbitrary Code Execution

Loading modules securely with third-party apps is not easy. Write a PoC application and exploit the vulnerability!

5. Secure Flag Bypass

Another Frida-based task. No real vulnerability here, just has fun bypassing the secure flag!

6. Certificate Pinning Bypass

Certificate pinning is implemented using the OkHttp library. You have to bypass it in order to view the traffic with Burp Suite.

7. Insecure Broadcast Receiver

There’s a vulnerable broadcast receiver in the application. Trigger it with the correct data and you’re done!

8. Deep Link Exploitation

Similar to the insecure broadcast receiver, you need to provide the right query parameter to complete this task!

9. SQL Injection

Just a regular SQL injection that you’d find in web applications. No need to reverse the code to bypass the login mechanism.

10. Vulnerable WebView

You can also complete this task without decompiling the application. Pop an alert dialog and read files!

11. Smali Patching

In this task, you have to modify the execution flow of the application by editing the Smali code. Finally, rebuild and sign the APK!

12. Native Library

The application uses a native library that validates the entered password. Reverse engineer the library to find the password then use Frida to hook the native method.

Changelog v1.4

improve certificate pinning by extracting public key hashes from OkHttp exception
update library versions