CVE-2024-41942: JupyterHub has a privilege escalation vulnerability with the `admin:users` scope
First published: Thu Aug 08 2024(Updated: )
### Summary If a user is granted the `admin:users` scope, they may escalate their own privileges by making themselves a full admin user. ### Details The `admin:users` scope allows a user to edit user records: > admin:users > > Read, write, create and delete users and their authentication state, not including their servers or tokens. > > -- https://jupyterhub.readthedocs.io/en/stable/rbac/scopes.html#available-scopes However, this includes making users admins. Admin users are granted scopes beyond `admin:users` making this a mechanism by which granted scopes may be escalated. ### Impact The impact is relatively small in that `admin:users` is already an extremely privileged scope only granted to trusted users. In effect, `admin:users` is equivalent to `admin=True`, which is not intended. Note that the change here only prevents escalation to the built-in JupyterHub admin role that has unrestricted permissions. It does not prevent users with e.g. `groups` permissions from granting themselves or other users permissions via group membership, which is intentional.
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| pip/jupyterhub | >=5.0.0<5.1.0 | 5.1.0 |
| pip/jupyterhub | <4.1.6 | 4.1.6 |
| Jupyter JupyterHub | <4.1.6 | |
| Jupyter JupyterHub | =5.0.0 | |
| Jupyter JupyterHub | =5.0.0-beta1 | |
| Jupyter JupyterHub | =5.0.0-beta2 |
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Reference Links
- https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-9x4q-3gxw-849f
- https://github.com/jupyterhub/jupyterhub/commit/99e2720b0fc626cbeeca3c6337f917fdacfaa428
- https://github.com/jupyterhub/jupyterhub/commit/ff2db557a85b6980f90c3158634bf924063ab8ba
- https://nvd.nist.gov/vuln/detail/CVE-2024-41942
- https://github.com/advisories/GHSA-9x4q-3gxw-849f (Advisory)
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