CVE-2020-13293 : Security Advisory and Response

GitLab before versions 13.0.12, 13.1.6, and 13.2.3 is affected by a vulnerability that allows overriding an existing hash using a branch with a hexadecimal name.

Understanding CVE-2020-13293

In this section, we will delve into the details of the CVE-2020-13293 vulnerability.

What is CVE-2020-13293?

The vulnerability in GitLab before versions 13.0.12, 13.1.6, and 13.2.3 allows an attacker to override an existing hash by utilizing a branch with a hexadecimal name.

The Impact of CVE-2020-13293

The impact of this vulnerability is rated as MEDIUM with a base score of 6.3. It has a low attack complexity and requires user interaction. The integrity impact is high, while confidentiality impact is none.

Technical Details of CVE-2020-13293

Let's explore the technical aspects of CVE-2020-13293.

Vulnerability Description

The vulnerability involves using a branch with a hexadecimal name to override an existing hash in GitLab versions before 13.0.12, 13.1.6, and 13.2.3.

Affected Systems and Versions

Product: GitLab
Vendor: GitLab
Affected Versions: >=1.0, <13.0.12; >=13.1, <13.1.6; >=13.2, <13.2.3

Exploitation Mechanism

The vulnerability can be exploited by creating a branch with a hexadecimal name, allowing the attacker to override an existing hash.

Mitigation and Prevention

Learn how to mitigate and prevent the CVE-2020-13293 vulnerability.

Immediate Steps to Take

Update GitLab to versions 13.0.12, 13.1.6, or 13.2.3 to eliminate the vulnerability.
Avoid using branches with hexadecimal names.

Long-Term Security Practices

Regularly update GitLab to the latest versions to patch security vulnerabilities.
Educate users on secure coding practices to prevent similar issues.

Patching and Updates

Apply patches and updates provided by GitLab to ensure the security of your system.