CVE-2022-31027: Authorization Bypass Through User-Controlled Key when using CILogonOAuthenticator in oauthenticator
First published: Mon Jun 06 2022(Updated: )
OAuthenticator is an OAuth token library for the JupyerHub login handler. CILogonOAuthenticator is provided by the OAuthenticator package, and lets users log in to a JupyterHub via CILogon. This is primarily used to restrict a JupyterHub only to users of a given institute. The allowed_idps configuration trait of CILogonOAuthenticator is documented to be a list of domains that indicate the institutions whose users are authorized to access this JupyterHub. This authorization is validated by ensuring that the *email* field provided to us by CILogon has a *domain* that matches one of the domains listed in `allowed_idps`.If `allowed_idps` contains `berkeley.edu`, you might expect only users with valid current credentials provided by University of California, Berkeley to be able to access the JupyterHub. However, CILogonOAuthenticator does *not* verify which provider is used by the user to login, only the email address provided. So a user can login with a GitHub account that has email set to `<something>@berkeley.edu`, and that will be treated exactly the same as someone logging in using the UC Berkeley official Identity Provider. The patch fixing this issue makes a *breaking change* in how `allowed_idps` is interpreted. It's no longer a list of domains, but configuration representing the `EntityID` of the IdPs that are allowed, picked from the [list maintained by CILogon](https://cilogon.org/idplist/). Users are advised to upgrade.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Jupyter Oauthenticator | <15.0.0 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Frequently Asked Questions
What is CVE-2022-31027?
CVE-2022-31027 is a vulnerability in the OAuthenticator library used in JupyterHub for CILogon authentication.
What is the severity of CVE-2022-31027?
The severity of CVE-2022-31027 is medium, with a CVSS score of 6.5.
How does CVE-2022-31027 affect JupyterHub?
CVE-2022-31027 affects JupyterHub by allowing unauthorized users to log in via CILogon.
Which version of Jupyter Oauthenticator is affected by CVE-2022-31027?
Versions up to and excluding 15.0.0 of Jupyter Oauthenticator are affected by CVE-2022-31027.
How can I fix CVE-2022-31027?
To fix CVE-2022-31027, update your Jupyter Oauthenticator library to a version higher than 15.0.0.
- collector/nvd-index
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/references
- agent/author
- agent/weakness
- agent/severity
- agent/last-modified-date
- agent/title
- agent/description
- agent/event
- agent/first-publish-date
- agent/tags
- agent/source
- vendor/jupyter
- canonical/jupyter oauthenticator