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Security Advisories: GSA_kwCzR0hTQS01eHZjLXZnbXAtamdjM80Wvg
Improper Access Control in jupyterhub-firstuseauthenticator
Impact
When JupyterHub is used with FirstUseAuthenticator, the vulnerability allows unauthorized access to any user's account if create_users=True
and the username is known or guessed.
Patches
Upgrade to jupyterhub-firstuseauthenticator to 1.0, or apply patch https://github.com/jupyterhub/firstuseauthenticator/pull/38.patch
Workarounds
If you cannot upgrade, there is no complete workaround, but it can be mitigated.
If you cannot upgrade yet, you 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. If any users have never logged in with their normalized username (i.e. lowercase), they will still be vulnerable until you can patch or upgrade.
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS01eHZjLXZnbXAtamdjM80Wvg
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Critical
Classification: General
Published: over 2 years ago
Updated: 8 months ago
CVSS Score: 9.1
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Identifiers: GHSA-5xvc-vgmp-jgc3, CVE-2021-41194
References:
- https://github.com/jupyterhub/firstuseauthenticator/security/advisories/GHSA-5xvc-vgmp-jgc3
- https://nvd.nist.gov/vuln/detail/CVE-2021-41194
- https://github.com/jupyterhub/firstuseauthenticator/pull/38
- https://github.com/jupyterhub/firstuseauthenticator/pull/38.patch
- https://github.com/jupyterhub/firstuseauthenticator/pull/38/commits/32b21898fb2b53b1a2e36270de6854ad70e9e9bf
- https://github.com/jupyterhub/firstuseauthenticator/pull/38/commits/9e200d974e0cb85d828a6afedb8ab90a37878f28
- https://github.com/jupyterhub/firstuseauthenticator/commit/953418e2450dbc2d854e332350849533b0ebc7ba
- https://github.com/advisories/GHSA-5xvc-vgmp-jgc3
Blast Radius: 14.2
Affected Packages
pypi:jupyterhub-firstuseauthenticator
Dependent packages: 0Dependent repositories: 36
Downloads: 9,428 last month
Affected Version Ranges: < 1.0.0
Fixed in: 1.0.0
All affected versions: 0.13.0, 0.14.0, 0.14.1
All unaffected versions: 1.0.0