CVE-2020-10078 : Security Advisory and Response

GitLab 12.1 through 12.8.1 has a stored cross-site scripting (XSS) vulnerability in the merge request submission form.

Understanding CVE-2020-10078

What is CVE-2020-10078?

GitLab versions 12.1 through 12.8.1 are susceptible to XSS due to a vulnerability in the merge request submission form.

The Impact of CVE-2020-10078

This vulnerability allows attackers to execute malicious scripts in the context of a user's session, potentially leading to unauthorized actions or data theft.

Technical Details of CVE-2020-10078

Vulnerability Description

The XSS vulnerability in GitLab 12.1 through 12.8.1 resides in the merge request submission form, enabling the injection of malicious scripts.

Affected Systems and Versions

Affected Versions: GitLab 12.1 through 12.8.1

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting malicious scripts into the merge request submission form, which are then executed in the context of the victim's session.

Mitigation and Prevention

Immediate Steps to Take

Upgrade GitLab to a non-vulnerable version beyond 12.8.1.
Implement input validation mechanisms to sanitize user inputs and prevent script injection.

Long-Term Security Practices

Regularly update and patch GitLab to the latest secure versions.
Educate users on safe coding practices to prevent XSS vulnerabilities.

Patching and Updates

Ensure timely installation of security patches and updates provided by GitLab to address known vulnerabilities.