CVE-2021-41194

Published on: 10/28/2021 12:00:00 AM UTC

Last Modified on: 11/03/2021 12:26:00 PM UTC

CVE-2021-41194 - advisory for GHSA-5xvc-vgmp-jgc3

Source: Mitre Source: Nist Print: PDF PDF
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Certain versions of First Use Authenticator from Jupyterhub contain the following vulnerability:

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.

  • CVE-2021-41194 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as CRITICAL severity.
  • Affected Vendor/Software: URL Logo jupyterhub - firstuseauthenticator version < 1.0.0

CVSS3 Score: 9.8 - CRITICAL

Attack
Vector
Attack
Complexity
Privileges
Required
User
Interaction
NETWORK LOW NONE NONE
Scope Confidentiality
Impact
Integrity
Impact
Availability
Impact
UNCHANGED HIGH HIGH HIGH

CVSS2 Score: 6.8 - MEDIUM

Access
Vector
Access
Complexity
Authentication
NETWORK MEDIUM NONE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
PARTIAL PARTIAL PARTIAL

CVE References

Description Tags Link
normalize username to lock password by georgejhunt · Pull Request #38 · jupyterhub/firstuseauthenticator · GitHub github.com
text/html
URL Logo MISC github.com/jupyterhub/firstuseauthenticator/pull/38
github.com
text/x-diff
URL Logo MISC github.com/jupyterhub/firstuseauthenticator/pull/38.patch
Improper Access Control in jupyterhub-firstuseauthenticator · Advisory · jupyterhub/firstuseauthenticator · GitHub github.com
text/html
URL Logo CONFIRM github.com/jupyterhub/firstuseauthenticator/security/advisories/GHSA-5xvc-vgmp-jgc3

Related QID Numbers

  • 980217 Python (pip) Security Update for jupyterhub-firstuseauthenticator (GHSA-5xvc-vgmp-jgc3)

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
ApplicationJupyterhubFirst Use AuthenticatorAllAllAllAll
  • cpe:2.3:a:jupyterhub:first_use_authenticator:*:*:*:*:*:*:*:*:

Social Mentions

Source Title Posted (UTC)
Twitter Icon @CVEreport CVE-2021-41194 : FirstUseAuthenticator is a JupyterHub authenticator that helps new users set their password on the… twitter.com/i/web/status/1… 2021-10-28 19:46:04
Twitter Icon @LinInfoSec Jupyterhub - CVE-2021-41194: github.com/jupyterhub/fir… 2021-10-28 23:15:11
Twitter Icon @0_exploit CVE-2021-41194 dlvr.it/SBV8w5 2021-10-28 23:33:03
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