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CVE-2020-5415 : What You Need to Know

Learn about CVE-2020-5415 affecting Concourse by VMware Tanzu. This critical vulnerability allows identity spoofing through GitLab authentication, impacting confidentiality and integrity.

Concourse, versions prior to 6.3.1 and 6.4.1, in installations using the GitLab auth connector, is vulnerable to identity spoofing. This CVE allows impersonation by configuring a GitLab account with the same full name as another user who has access to a Concourse team.

Understanding CVE-2020-5415

This CVE affects Concourse, a product by VMware Tanzu, and was made public on August 12, 2020.

What is CVE-2020-5415?

CVE-2020-5415 is a vulnerability in Concourse versions prior to 6.3.1 and 6.4.1 when using the GitLab auth connector. It allows for identity spoofing by manipulating GitLab accounts.

The Impact of CVE-2020-5415

The vulnerability has a CVSS base score of 10 (Critical severity) and high impacts on confidentiality and integrity. It requires no privileges and has a low attack complexity and vector.

Technical Details of CVE-2020-5415

Concourse's vulnerability to identity spoofing through GitLab authentication.

Vulnerability Description

        Identity spoofing via GitLab accounts with the same full name

Affected Systems and Versions

        Affected versions: 6.3 and 6.4
        Products: Concourse by VMware Tanzu

Exploitation Mechanism

        Configuration of a GitLab account with the same full name as another user
        Vulnerable in installations using the GitLab auth connector

Mitigation and Prevention

Steps to address and prevent the CVE-2020-5415 vulnerability.

Immediate Steps to Take

        Upgrade Concourse to version 6.3.1 or 6.4.1
        Avoid configuring GitLab accounts with duplicate full names

Long-Term Security Practices

        Regularly review and update authentication mechanisms
        Implement multi-factor authentication for enhanced security

Patching and Updates

        Apply security patches and updates provided by VMware Tanzu for Concourse

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