CVE-2021-41194: Improper Access Control in jupyterhub-firstuseauthenticator
First published: Thu Oct 28 2021(Updated: )
### 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.
Credit: security-advisories@github.com security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| pip/jupyterhub-firstuseauthenticator | <1.0.0 | 1.0.0 |
| <1.0.0 | ||
| Jupyterhub First Use Authenticator | <1.0.0 |
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Reference Links
- 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 (Advisory)
- https://github.com/pypa/advisory-database/tree/main/vulns/jupyterhub-firstuseauthenticator/PYSEC-2021-384.yaml
Frequently Asked Questions
What is the impact of CVE-2021-41194?
The vulnerability allows unauthorized access to any user's account.
How can the CVE-2021-41194 vulnerability be exploited?
Unauthorized users can gain access to any user's account.
Which versions of JupyterHub FirstUseAuthenticator are affected by CVE-2021-41194?
Versions prior to 1.0.0 are affected.
How can I fix the CVE-2021-41194 vulnerability?
Upgrade to JupyterHub FirstUseAuthenticator version 1.0.0 or later.
What is the Common Weakness Enumeration (CWE) of CVE-2021-41194?
The CWE of CVE-2021-41194 is 284.
- collector/nvd-index
- agent/author
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- canonical/jupyterhub first use authenticator