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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.

Permalink: https://github.com/advisories/GHSA-5xvc-vgmp-jgc3
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: Repository: https://github.com/jupyterhub/firstuseauthenticator
Blast Radius: 14.2

Affected Packages

pypi:jupyterhub-firstuseauthenticator
Dependent packages: 0
Dependent 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