CVE-2021-41194: Jupyterhub firstuseauthenticator Improper Access Control Vulnerability
CRITICALCVE-2021-41194 is a CRITICAL (CVSS 9.1) improper access control vulnerability (CWE-284: Improper Access Control) affecting Jupyterhub firstuseauthenticator libraries in the PyPI ecosystem. The issue involves improper access control in jupyterhub-firstuseauthenticator. Remediation is available by upgrading affected packages to version 1.0.0.
CVE-2021-41194 at a Glance
Security Impact
CVSS: 9.1
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).
How to Fix CVE-2021-41194
To remediate this vulnerability, upgrade all affected Jupyterhub firstuseauthenticator dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
pip install jupyterhub-firstuseauthenticator>=1.0.0Run the following command in your project directory to verify that all resolved dependencies use the patched release:
pip show jupyterhub-firstuseauthenticatorHow to Check if You Are Affected
To determine whether your Python environment is affected by CVE-2021-41194, inspect your installed packages using pip:
pip show jupyterhub-firstuseauthenticatorAnalyze the terminal output to locate any version of Jupyterhub firstuseauthenticator in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.0.0), your application is affected.
Note: The pip show jupyterhub-firstuseauthenticator command checks currently installed packages in your active Python environment.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-284: Improper Access Control, where the product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. In Jupyterhub firstuseauthenticator, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2021-41194 Affected Jupyterhub firstuseauthenticator Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
jupyterhub-firstuseauthenticator
|
PyPI |
< 1.0.0
|
1.0.0
|
References
Frequently Asked Questions
What is CVE-2021-41194?
Which Jupyterhub firstuseauthenticator versions are affected?
What version fixes CVE-2021-41194?
Is jupyterhub-firstuseauthenticator affected?
What is the CVSS score of CVE-2021-41194?
What CWE is associated with CVE-2021-41194?
How can I check PyPI dependencies for CVE-2021-41194?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-5xvc-vgmp-jgc3",
"modified" : "2024-09-24T21:11:48Z",
"published" : "2021-10-28T23:13:57Z",
"aliases" : [ "CVE-2021-41194" ],
"summary" : "Improper Access Control in jupyterhub-firstuseauthenticator",
"details" : "### Impact\n\nWhen 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.\n\n### Patches\n\nUpgrade to jupyterhub-firstuseauthenticator to 1.0, or apply patch https://github.com/jupyterhub/firstuseauthenticator/pull/38.patch\n\n### Workarounds\n\nIf you cannot upgrade, there is no complete workaround, but it can be mitigated.\n\nIf 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.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
}, {
"type" : "CVSS_V4",
"score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "PyPI",
"name" : "jupyterhub-firstuseauthenticator"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "1.0.0"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/jupyterhub/firstuseauthenticator/security/advisories/GHSA-5xvc-vgmp-jgc3"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-41194"
}, {
"type" : "WEB",
"url" : "https://github.com/jupyterhub/firstuseauthenticator/pull/38"
}, {
"type" : "WEB",
"url" : "https://github.com/jupyterhub/firstuseauthenticator/pull/38.patch"
}, {
"type" : "WEB",
"url" : "https://github.com/jupyterhub/firstuseauthenticator/pull/38/commits/32b21898fb2b53b1a2e36270de6854ad70e9e9bf"
}, {
"type" : "WEB",
"url" : "https://github.com/jupyterhub/firstuseauthenticator/pull/38/commits/9e200d974e0cb85d828a6afedb8ab90a37878f28"
}, {
"type" : "WEB",
"url" : "https://github.com/jupyterhub/firstuseauthenticator/commit/953418e2450dbc2d854e332350849533b0ebc7ba"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/jupyterhub/firstuseauthenticator"
}, {
"type" : "WEB",
"url" : "https://github.com/pypa/advisory-database/tree/main/vulns/jupyterhub-firstuseauthenticator/PYSEC-2021-384.yaml"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-284" ],
"severity" : "CRITICAL",
"github_reviewed" : true,
"github_reviewed_at" : "2021-10-28T16:52:16Z",
"nvd_published_at" : "2021-10-28T20:15:00Z"
}
}