Arduino A5 — Checkm8

For learning USB exploit development, study the checkm8 source code – it's only ~500 lines of C!

// Checkm8 magic values (simplified) #define CHECKM8_LEAK_SIZE 0x800 // Overflow size #define CHECKM8_MAGIC1 0xA5A5A5A5 #define CHECKM8_MAGIC2 0x5A5A5A5A arduino a5 checkm8

// Step 3: Trigger reboot with pwned flag setup.bRequest = 0xFF; // Reset with pwn setup.wValue = 0x1; device->ctrlReq(&setup, nullptr, 0); For learning USB exploit development, study the checkm8

setup.bRequest = 0xFE; // Vendor specific setup.wValue = CHECKM8_MAGIC2; setup.wLength = 0; device->ctrlReq(&setup, nullptr, 0); For learning USB exploit development

checkra1n --pwn-5s # For A5 devices | Requirement | Arduino | PC/Linux | |-------------|---------|----------| | USB host with precise timing | ❌ | ✅ | | Custom USB descriptors | ❌ | ✅ | | Kernel-level USB control | ❌ | ✅ | | ARM shellcode execution | ❌ | ✅ |