{"id":"PYSEC-2021-384","details":"FirstUseAuthenticator is a JupyterHub authenticator that helps new users set their password on their first login to JupyterHub. When JupyterHub is used with FirstUseAuthenticator, a vulnerability in versions prior to 1.0.0 allows unauthorized access to any user's account if `create_users=True` and the username is known or guessed. One may upgrade to version 1.0.0 or apply a patch manually to mitigate the vulnerability. For those who cannot upgrade, there is no complete workaround, but a partial mitigation exists. One 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 1.0.0. If any users have never logged in with their normalized username (i.e. lowercase), they will still be vulnerable until a patch or upgrade occurs.","aliases":["CVE-2021-41194","GHSA-5xvc-vgmp-jgc3"],"modified":"2023-11-08T04:06:54.528947Z","published":"2021-10-28T20:15:00Z","references":[{"type":"WEB","url":"https://github.com/jupyterhub/firstuseauthenticator/pull/38.patch"},{"type":"ADVISORY","url":"https://github.com/jupyterhub/firstuseauthenticator/security/advisories/GHSA-5xvc-vgmp-jgc3"},{"type":"WEB","url":"https://github.com/jupyterhub/firstuseauthenticator/pull/38"}],"affected":[{"package":{"name":"jupyterhub-firstuseauthenticator","ecosystem":"PyPI","purl":"pkg:pypi/jupyterhub-firstuseauthenticator"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.0"}]}],"versions":["0.10","0.11","0.12","0.13.0","0.14.0","0.14.1","0.9"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/jupyterhub-firstuseauthenticator/PYSEC-2021-384.yaml"}}],"schema_version":"1.7.3"}