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GHSA-9x4q-3gxw-849f
No affected components available
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.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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