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CVE-2021-41247

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Date: November 4, 2021

JupyterHub is an open source multi-user server for Jupyter notebooks. In affected versions users who have multiple JupyterLab tabs open in the same browser session, may see incomplete logout from the single-user server, as fresh credentials (for the single-user server only, not the Hub) reinstated after logout, if another active JupyterLab session is open while the logout takes place. Upgrade to JupyterHub 1.5. For distributed deployments, it is jupyterhub in the _user_ environment that needs patching. There are no patches necessary in the Hub environment. The only workaround is to make sure that only one JupyterLab tab is open when you log out.

Language: Python

Severity Score

Related Resources (6)

https://nvd.nist.gov/vuln/detail/CVE-2021-41247
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-41247
https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-cw7p-q79f-m2v7
https://security-tracker.debian.org/tracker/CVE-2021-41247
https://github.com/jupyterhub/jupyterhub/commit/5ac9e7f73a6e1020ffddc40321fc53336829fe27
https://www.mend.io/vulnerability-database/CVE-2021-41247

Severity Score

Weakness Type (CWE)

Insufficient Session Expiration

CWE-613

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): HIGH
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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