Allsafe – Intentionally Vulnerable Android Application
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!
Useful Frida Scripts
I have my Frida scripts (more like templates) in other repository. I’m sure they might be quite handy for the Frida related tasks. Check it out: https://github.com/t0thkr1s/frida
Tasks / Vulnerabilities
1. Insecure Logging
Simple information disclosure vulnerability. Use the logcat
command-line tool to discover sensitive information.
Resources & HackerOne Reports:
- Logcat Tool
- Coinbase OAuth Response Code Leak
2. Hardcoded Credentials
Some credentials are left in the code. Your task is to reverse engineer the app and find sensitive information.
Resources & HackerOne Reports:
- Zomato Hardcoded Credentials
- 8×8 Hardcoded Credentials
- Reverb Hardcoded API Secret
3. Root Detection
This is purely for Frida practice. Make the code believe that you device is not rooted!
4. Arbitrary Code Execution
Loading modules securely with third-party apps are not easy. Write a PoC application and exploit the vulnerability!
Resources & HackerOne Reports:
- Arbitrary Code Execution via Third-Party Package Contexts
5. Secure Flag Bypass
Another Frida-based task. No real vulnerability here, just have fun bypassing the secure flag!
Resources & HackerOne Reports:
- Android FLAG_SECURE Reference
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.
Resources & HackerOne Reports:
- Certificate and Public Key Pinning
- Coinbase Vulnerabilities
7. Insecure Broadcast Receiver
There’s a vulnerable broadcast recevier in the application. Trigger it with the correct data and you’re done!
Resources & HackerOne Reports:
- Android Broadcasts Overview
- ok.ru Broadcast Receiver Exploitation
- Bitwarden Vulnerable Broadcast Receiver
8. Deep Link Exploitation
Similar to the insecure broadcast receiver, you need to provide the right query parameter to complete this task!
Resources & HackerOne Reports:
- Android Deep Linking
- Grab Insecure Deep Link
- Periscope Deep Link CSRF
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.
Resources & HackerOne Reports:
- SQL Injection in Content Provider
Show me how it’s done!
# TODO
10. Vulnerable WebView
You can also complete this task without decompiling the application. Pop an alert dialog and read files!
Resources & HackerOne Reports:
- ownCloud WebView XSS
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!
Resources & HackerOne Reports:
- Uber APK Signer
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.
Resources & HackerOne Reports:
- Ghidra
- Cutter
If you like the site, please consider joining the telegram channel or supporting us on Patreon using the button below.