CVE-2020-26250

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Summary

CVECVE-2020-26250
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-12-01 21:15:00 UTC
Updated2020-12-08 17:50:00 UTC
DescriptionOAuthenticator is an OAuth login mechanism for JupyterHub. In oauthenticator from version 0.12.0 and before 0.12.2, the deprecated (in jupyterhub 1.2) configuration `Authenticator.whitelist`, which should be transparently mapped to `Authenticator.allowed_users` with a warning, is instead ignored by OAuthenticator classes, resulting in the same behavior as if this configuration has not been set. If this is the only mechanism of authorization restriction (i.e. no group or team restrictions in configuration) then all authenticated users will be allowed. Provider-based restrictions, including deprecated values such as `GitHubOAuthenticator.org_whitelist` are **not** affected. All users of OAuthenticator 0.12.0 and 0.12.1 with JupyterHub 1.2 (JupyterHub Helm chart 0.10.0-0.10.5) who use the `admin.whitelist.users` configuration in the jupyterhub helm chart or the `c.Authenticator.whitelist` configuration directly. Users of other deprecated configuration, e.g. `c.GitHubOAuthenticator.team_whitelist` are **not** affected. If you see a log line like this and expect a specific list of allowed usernames: "[I 2020-11-27 16:51:54.528 JupyterHub app:1717] Not using allowed_users. Any authenticated user will be allowed." you are likely affected. Updating oauthenticator to 0.12.2 is recommended. A workaround is to replace the deprecated `c.Authenticator.whitelist = ...` with `c.Authenticator.allowed_users = ...`. If any users have been authorized during this time who should not have been, they must be deleted via the API or admin interface, per the referenced documentation.

Risk And Classification

Problem Types: CWE-863

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Jupyter Oauthenticator All All All All
Application Jupyter Oauthenticator All All All All

References

ReferenceSourceLinkTags
oauthenticator/changelog.md at master · jupyterhub/oauthenticator · GitHub MISC github.com Release Notes, Third Party Advisory
Authentication and User Basics — JupyterHub 1.2.2 documentation MISC jupyterhub.readthedocs.io Third Party Advisory
Base class whitelist configuration ignored - any authenticated user get access · Advisory · jupyterhub/oauthenticator · GitHub CONFIRM github.com Third Party Advisory
Merge pull request from GHSA-384w-5v3f-q499 · jupyterhub/oauthenticator@a4aac19 · GitHub MISC github.com Patch, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 983223 Python (pip) Security Update for oauthenticator (GHSA-384w-5v3f-q499)
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