CVE-2019-11548 : Security Advisory and Response

A vulnerability was found in GitLab Community and Enterprise Editions prior to version 11.8.9. The issue involves an incorrect access control mechanism where non-privileged members of a project can leave comments on confidential issues due to an authorization flaw in the note endpoint.

Understanding CVE-2019-11548

This CVE identifies a security vulnerability in GitLab versions before 11.8.9 that allows unauthorized access to confidential issue comments.

What is CVE-2019-11548?

CVE-2019-11548 is a vulnerability in GitLab Community and Enterprise Editions that enables non-privileged project members to comment on confidential issues, breaching access control.

The Impact of CVE-2019-11548

The vulnerability allows unauthorized users to view and comment on confidential issues, potentially leading to data leaks and unauthorized access to sensitive information.

Technical Details of CVE-2019-11548

This section provides more in-depth technical details about the vulnerability.

Vulnerability Description

The issue stems from an incorrect access control mechanism in GitLab versions prior to 11.8.9, allowing non-privileged users to comment on confidential issues.

Affected Systems and Versions

GitLab Community and Enterprise Editions before version 11.8.9

Exploitation Mechanism

Unauthorized users exploit an authorization flaw in the note endpoint to leave comments on confidential issues.

Mitigation and Prevention

To address and prevent the CVE-2019-11548 vulnerability, follow these steps:

Immediate Steps to Take

Upgrade GitLab to version 11.8.9 or later to mitigate the vulnerability.
Review and adjust project access controls to restrict unauthorized commenting on confidential issues.

Long-Term Security Practices

Regularly monitor and audit access controls within GitLab to prevent similar unauthorized access issues.
Educate project members on the importance of confidentiality and proper commenting protocols.

Patching and Updates

Stay informed about security updates and patches released by GitLab to address vulnerabilities promptly.