Vulnerability · Published Jun 11, 2024 · Assigned by GitHub_M
CVE-2024-35225Jupyter Server Proxy has a reflected XSS issue in host parameter
Critical 9.7
In plain English
A critical-severity cross-site scripting in jupyter-server-proxy from jupyterhub. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Jupyter Server Proxy allows users to run arbitrary external processes alongside their notebook server and provide authenticated web access to them. Versions of 3.x prior to 3.2.4 and 4.x prior to 4.2.0 have a reflected cross-site scripting (XSS) issue. The `/proxy` endpoint accepts a `host` path segment in the format `/proxy/<host>`. When this endpoint is called with an invalid `host` value, `jupyter-server-proxy` replies with a response that includes the value of `host`, without sanitization [2]. A third-party actor can leverage this by sending a phishing link with an invalid `host` value containing custom JavaScript to a user. When the user clicks this phishing link, the browser renders the response of `GET /proxy/<host>`, which runs the custom JavaScript contained in `host` set by the actor. As any arbitrary JavaScript can be run after the user clicks on a phishing link, this issue permits extensive access to the user's JupyterLab instance for an actor. Patches are included in versions 4.2.0 and 3.2.4. As a workaround, server operators who are unable to upgrade can disable the `jupyter-server-proxy` extension.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | jupyter-server-proxy | 3.2.4 | GHSA-fvcq-4x64-hqxr |
| PyPI | jupyter-server-proxy | 4.2.0 | GHSA-fvcq-4x64-hqxr |
| PyPI | jupyter-server-proxy | 3.2.4, 4.2.0 | PYSEC-2024-236 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| jupyterhub | jupyter-server-proxy | >= 3.0.0, < 3.2.4>= 4.0.0, < 4.2.0 |
Weakness: CWE-79, CWE-116 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
References
- https://github.com/jupyterhub/jupyter-server-proxy/security/advisories/GHSA-fvcq-4x64-hqxr x_refsource_CONFIRM
- https://github.com/jupyterhub/jupyter-server-proxy/commit/7abc9dc5bbb0b4b440548a5375261b8b8192fc22 x_refsource_MISC
- https://github.com/jupyterhub/jupyter-server-proxy/commit/ff78128087e73fb9d0909e1366f8bf051e8ea878 x_refsource_MISC
- https://github.com/jupyterhub/jupyter-server-proxy/blob/62a290f08750f7ae55a0c29ca339c9a39a7b2a7b/jupyter_server_proxy/handlers.py#L328 x_refsource_MISC