CVE-2019-6788 : Security Advisory and Response

A vulnerability was found in GitLab Community and Enterprise Editions, specifically versions prior to 11.5.8, 11.6.x before 11.6.6, and 11.7.x before 11.7.1. This vulnerability, labeled as 'issue 3 of 6,' can lead to unauthorized information disclosure. If GitHub or Bitbucket OAuth integrations are in use, a subtle redirect method can be exploited to acquire the user's OAuth token for those services.

Understanding CVE-2019-6788

This CVE identifies a security flaw in GitLab versions before 11.5.8, 11.6.x before 11.6.6, and 11.7.x before 11.7.1 that could result in unauthorized information exposure.

What is CVE-2019-6788?

CVE-2019-6788 is a vulnerability in GitLab Community and Enterprise Editions that allows for unauthorized information disclosure through a specific method of exploiting GitHub or Bitbucket OAuth integrations.

The Impact of CVE-2019-6788

The vulnerability can be exploited to obtain the user's OAuth token for GitHub or Bitbucket services, potentially leading to unauthorized access to sensitive information.

Technical Details of CVE-2019-6788

This section provides more technical insights into the vulnerability.

Vulnerability Description

The issue in GitLab versions before 11.5.8, 11.6.x before 11.6.6, and 11.7.x before 11.7.1 allows for unauthorized information disclosure, marked as 'issue 3 of 6.'

Affected Systems and Versions

GitLab Community and Enterprise Editions prior to 11.5.8, 11.6.x before 11.6.6, and 11.7.x before 11.7.1.

Exploitation Mechanism

Exploiting GitHub or Bitbucket OAuth integrations using a covert redirect method to acquire the user's OAuth token.

Mitigation and Prevention

Protecting systems from CVE-2019-6788 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update GitLab to versions 11.5.8, 11.6.6, or 11.7.1 or later to mitigate the vulnerability.
Disable GitHub or Bitbucket OAuth integrations if not essential.

Long-Term Security Practices

Regularly monitor and update software to patch known vulnerabilities.
Implement multi-factor authentication to enhance security.

Patching and Updates

Apply security patches provided by GitLab promptly to address CVE-2019-6788.