CVE-2024-35225

Advisory

Jupyter Server Proxy allows users to run arbitrary external processes alongside their notebook server and provide authenticated web access to them. A reflected cross-site scripting (XSS) issue exists in the /proxy endpoint, which accepts a host path segment in the format /proxy/<host>. When called with an invalid host value, jupyter-server-proxy replies with a response that includes the value of host without sanitization. This allows a third-party actor to send a phishing link with an invalid host value containing custom JavaScript to a user. When the user clicks the link, the browser renders the response, running the custom JavaScript. This issue permits extensive access to the user's JupyterLab instance for an actor. Patches are available, and as a workaround, server operators can disable the jupyter-server-proxy extension.

Affected package

Affected versions

Fixed versions

Vulnerability changelog

This vulnerability has no description

Resources

• https://github.com/jupyterhub/jupyter-server-proxy/security/advisories/GHSA-fvcq-4x64-hqxr
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-35225