CVE-2020-26275 : What You Need to Know

The Jupyter Server before version 1.1.1 is affected by an open redirect vulnerability that could lead to browser redirection to malicious websites.

Understanding CVE-2020-26275

Jupyter Server is the backend for Jupyter web applications like Jupyter notebook and JupyterLab.

What is CVE-2020-26275?

The vulnerability in Jupyter Server before version 1.1.1 allows malicious redirection to spoofed servers on the public internet.

The Impact of CVE-2020-26275

CVSS Base Score: 6.1 (Medium)
Attack Vector: Network
User Interaction: Required
Scope: Changed
Attack Complexity: Low
Confidentiality and Integrity Impact: Low
Privileges Required: None
Availability Impact: None
Vulnerability Type: CWE-601 URL Redirection to Untrusted Site ('Open Redirect')

Technical Details of CVE-2020-26275

The technical aspects of the vulnerability in Jupyter Server.

Vulnerability Description

The open redirect vulnerability in Jupyter Server could redirect browsers to malicious websites.

Affected Systems and Versions

Product: Jupyter Server
Vendor: jupyter-server
Versions Affected: < 1.1.1

Exploitation Mechanism

The vulnerability can be exploited by crafting malicious links for known Jupyter Server hosts.

Mitigation and Prevention

Protecting systems from the CVE-2020-26275 vulnerability.

Immediate Steps to Take

Upgrade Jupyter Server to version 1.1.1
Run the server on a URL prefix: "jupyter server --ServerApp.base_url=/jupyter/"

Long-Term Security Practices

Regularly update and patch Jupyter Server
Implement secure coding practices

Patching and Updates

Ensure timely installation of security patches and updates for Jupyter Server.