OAuthenticator is software that allows OAuth2 identity providers to be plugged in and used with JupyterHub. Prior to version 17.4.0, an authentication bypass vulnerability in oauthenticator allows an attacker with an unverified email address on an Auth0 tenant to login to JupyterHub. When email is used as the usrname_claim, this gives users control over their username and the possibility of account takeover.
This issue has been patched in version 17.4.0.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 3
https://github.com/jupyterhub/oauthenticator/commit/f0c7002dc36e41efae0f674033c…
security-advisories@github.com
https://github.com/jupyterhub/oauthenticator/releases/tag/17.4.0
security-advisories@github.com
https://github.com/jupyterhub/oauthenticator/security/advisories/GHSA-rrvg-cxh4…
security-advisories@github.com