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GHSA-7r3h-4ph8-w38g

HighCVSS 8.1 / 10
Published Mar 28, 2024·Last modified Apr 3, 2024
Affected Components(0)

No affected components available

Description

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"
Risk Scores
Base Score
8.1

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data.

Threat Intelligence
7.4

Exploitation activity has been observed. Apply available patches or mitigations urgently.

EPSS
0.33%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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