CVE-2021-41194
Description
FirstUseAuthenticator is a JupyterHub authenticator that helps new users set their password on their first login to JupyterHub. When JupyterHub is used with FirstUseAuthenticator, a vulnerability in versions prior to 1.0.0 allows unauthorized access to any user's account if `create_users=True` and the username is known or guessed. One may upgrade to version 1.0.0 or apply a patch manually to mitigate the vulnerability. For those who cannot upgrade, there is no complete workaround, but a partial mitigation exists. One can disable user creation with `c.FirstUseAuthenticator.create_users = False`, which will only allow login with fully normalized usernames for already existing users prior to jupyterhub-firstuserauthenticator 1.0.0. If any users have never logged in with their normalized username (i.e. lowercase), they will still be vulnerable until a patch or upgrade occurs.
How to fix
- jupyterhub first_use_authenticator1.0.0 or later
- jupyterhub-firstuseauthenticator1.0.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| jupyterhub first_use_authenticator | v < 1.0.0 | 1.0.0 |
| jupyterhub-firstuseauthenticatorPyPI | v < 1.0.0 | 1.0.0 |
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