CVE-2023-5198 : Security Advisory and Response

This CVE-2023-5198 affects GitLab, specifically versions prior to 16.2.7, versions starting from 16.3 before 16.3.5, and versions starting from 16.4 before 16.4.1. The vulnerability allowed a removed project member to write to protected branches using deploy keys.

Understanding CVE-2023-5198

This section provides insights into the nature and impact of CVE-2023-5198.

What is CVE-2023-5198?

CVE-2023-5198 refers to an improper access control vulnerability in GitLab. It allows a removed project member to unauthorizedly write to protected branches using deploy keys, potentially leading to unauthorized access and modifications.

The Impact of CVE-2023-5198

The vulnerability can be exploited by a removed project member to gain unauthorized access and make changes to protected branches, compromising the integrity and security of the GitLab instance.

Technical Details of CVE-2023-5198

Delve deeper into the technical aspects of CVE-2023-5198 to understand its implications.

Vulnerability Description

The vulnerability arises from improper access control mechanisms in GitLab, allowing unauthorized write access to protected branches by removed project members using deploy keys.

Affected Systems and Versions

GitLab versions prior to 16.2.7, versions starting from 16.3 before 16.3.5, and versions starting from 16.4 before 16.4.1 are impacted by this vulnerability.

Exploitation Mechanism

The exploit involves leveraging the improper access control to manipulate deploy keys and gain unauthorized write access to protected branches, potentially leading to unauthorized modifications.

Mitigation and Prevention

Explore the necessary steps to mitigate the risks associated with CVE-2023-5198 and prevent potential exploitation.

Immediate Steps to Take

Users are advised to upgrade their GitLab installations to versions 16.4.1, 16.3.5, 16.2.8, or above to address the vulnerability and eliminate the risk of unauthorized access and modifications.

Long-Term Security Practices

Implement robust access control policies, regularly monitor and review project permissions, and conduct security audits to ensure the overall security posture of the GitLab instance.

Patching and Updates

Regularly apply security patches and updates provided by GitLab to address known vulnerabilities and strengthen the security of the GitLab environment. Regularly review access controls and configurations to prevent unauthorized access and modifications.