exécution de code à distance via le fournisseur de dépôt git

The impact of CVE-2021-39159 is severe. Successful exploitation allows an attacker to execute arbitrary code within the BinderHub environment. This could lead to the exfiltration of sensitive credentials, including JupyterHub API tokens, Kubernetes service account tokens, and Docker registry credentials. With these credentials, an attacker could manipulate images and user-created pods within the deployment. Depending on the underlying Kubernetes configuration, this could potentially escalate to host compromise, granting complete control over the system. The ability to manipulate images poses a significant supply chain risk, as malicious images could be deployed to unsuspecting users.

Organizations utilizing BinderHub for interactive computing environments, particularly those deploying it within Kubernetes clusters, are at significant risk. Shared hosting environments where BinderHub is deployed alongside other services are also vulnerable, as a compromise could impact multiple users. Users relying on BinderHub for sensitive data processing or image building are especially at risk.

• python / binderhub:

import requests

url = 'http://binderhub-url/hub/user'
headers = {'X-Requested-With': 'XMLHttpRequest'}

# Attempt to trigger the vulnerability with a crafted payload
response = requests.get(url, headers=headers)

if response.status_code == 200:
    print('Potential vulnerability detected. Review response content.')
else:
    print('No vulnerability detected.')

• linux / server:

journalctl -u binderhub -f | grep -i "error" # Monitor for errors related to input processing

1. 2021-08-30Disclosure

   disclosure

1. Réservé2021-08-16
2. Publiée2021-08-30
3. Modifiée2026-03-13
4. EPSS mis à jour2026-04-02

The primary mitigation for CVE-2021-39159 is to upgrade BinderHub to version 0.2.0 or later, which contains the fix. If upgrading immediately is not feasible, consider implementing temporary workarounds. Review and restrict access to the JupyterHub API. Implement strict Kubernetes Role-Based Access Control (RBAC) to limit the permissions of service accounts. Monitor BinderHub logs for suspicious activity, particularly related to image pulls and pod creation. After upgrading, confirm the fix by attempting to reproduce the vulnerability with a known malicious input and verifying that the code execution is prevented.