GHSA-9X4Q-3GXW-849F

Vulnerability from github – Published: 2024-08-08 14:37 – Updated: 2025-01-21 17:56
VLAI?
Summary
JupyterHub has a privilege escalation vulnerability with the `admin:users` scope
Details

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.

Severity ?
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
8.6 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "jupyterhub"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "jupyterhub"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0"
            },
            {
              "fixed": "5.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-41942"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-274"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-08-08T14:37:06Z",
    "nvd_published_at": "2024-08-08T15:15:17Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nIf a user is granted the `admin:users` scope, they may escalate their own privileges by making themselves a full admin user.\n\n### Details\n\nThe `admin:users` scope allows a user to edit user records:\n\n\u003e admin:users\n\u003e\n\u003e Read, write, create and delete users and their authentication state, not including their servers or tokens.\n\u003e\n\u003e -- https://jupyterhub.readthedocs.io/en/stable/rbac/scopes.html#available-scopes\n\nHowever, this includes making users admins. Admin users are granted scopes beyond `admin:users` making this a mechanism by which granted scopes may be escalated.\n\n### Impact\n\nThe impact is relatively small in that `admin:users` is already an extremely privileged scope only granted to trusted users.\nIn effect, `admin:users` is equivalent to `admin=True`, which is not intended.\n\nNote 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.",
  "id": "GHSA-9x4q-3gxw-849f",
  "modified": "2025-01-21T17:56:40Z",
  "published": "2024-08-08T14:37:06Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-9x4q-3gxw-849f"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-41942"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jupyterhub/jupyterhub/commit/99e2720b0fc626cbeeca3c6337f917fdacfaa428"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jupyterhub/jupyterhub/commit/ff2db557a85b6980f90c3158634bf924063ab8ba"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/jupyterhub/jupyterhub"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/jupyterhub/PYSEC-2024-200.yaml"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "JupyterHub has a privilege escalation vulnerability with the `admin:users` scope"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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