GHSA-7r3h-4ph8-w38g: XSS

First published: Thu Mar 28 2024(Updated: )

### Impact Affected configurations: - Single-origin JupyterHub deployments - JupyterHub deployments with user-controlled applications running on subdomains or peer subdomains of either the Hub or a single-user server. By tricking a user into visiting a malicious subdomain, the attacker can achieve an XSS directly affecting the former's session. More precisely, in the context of JupyterHub, this XSS could achieve the following: - Full access to JupyterHub API and user's single-user server, e.g. - Create and exfiltrate an API Token - Exfiltrate all files hosted on the user's single-user server: notebooks, images, etc. - Install malicious extensions. They can be used as a backdoor to silently regain access to victim's session anytime. ### Patches To prevent cookie-tossing: - Upgrade to JupyterHub 4.1 (both hub and user environment) - enable per-user domains via `c.JupyterHub.subdomain_host = "https://mydomain.example.org"` - set `c.JupyterHub.cookie_host_prefix_enabled = True` to enable domain-locked cookies or, if available (applies to earlier JupyterHub versions): - deploy jupyterhub on its own domain, not shared with any other services - enable per-user domains via `c.JupyterHub.subdomain_host = "https://mydomain.example.org"`

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• collector/github-advisory-latest
• source/GitHub
• alias/GHSA-7r3h-4ph8-w38g
• alias/CVE-2024-28233
• agent/software-canonical-lookup
• agent/weakness
• agent/severity
• agent/references
• agent/softwarecombine
• agent/last-modified-date
• agent/tags
• agent/type
• agent/description
• agent/event
• agent/first-publish-date
• package-manager/pip