Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS03cjNoLTRwaDgtdzM4Z84AA6at

Cross site scripting (XSS) in JupyterHub via Self-XSS leveraged by Cookie Tossing

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"

Permalink: https://github.com/advisories/GHSA-7r3h-4ph8-w38g
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS03cjNoLTRwaDgtdzM4Z84AA6at
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: about 1 month ago
Updated: about 1 month ago

CVSS Score: 8.1
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Identifiers: GHSA-7r3h-4ph8-w38g, CVE-2024-28233
References:

• https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-7r3h-4ph8-w38g
• https://nvd.nist.gov/vuln/detail/CVE-2024-28233
• https://github.com/jupyterhub/jupyterhub/commit/e2798a088f5ad45340fe79cdf1386198e664f77f
• https://github.com/advisories/GHSA-7r3h-4ph8-w38g

Repository: https://github.com/jupyterhub/jupyterhub
Blast Radius: 23.5

Affected Packages