A critical vulnerability (CVE-2024-6446) has been discovered within GitLab, which is a web-based DevOps lifecycle tool that provides a Git repository manager. This issue impacts all GitLab versions from 17.1 to 17.1.7, 17.2 prior to 17.2.5, and 17.3 prior to 17.3.2. It allows attackers to create a specially crafted URL that could deceive users into trusting an attacker-controlled application. In this post, we'll uncover the details of this CVE-2024-6446 vulnerability, including a code snippet, original references, and how the exploit works.

Exploit Details

The underlying problem with the GitLab vulnerability occurs due to improper validation of user-supplied input. Attackers can exploit this vulnerability by creating a malicious link with a specifically designed URL, which tricks victims into clicking on it. Once clicked, unsuspecting users are redirected to attacker-controlled applications that may appear as legitimate GitLab pages, but in reality, allow attackers to steal sensitive information or execute malicious actions in the user's name.

Attackers could craft a URL similar to the example shown below

https://gitlab.example.com/auth/oauth2/callback?code=ATTACKER_CONTROLLED_CODE

When the user clicks on this URL, they are redirected to the attacker-controlled application, making it possible for hackers to perform malicious actions. This exploitation of the GitLab vulnerability requires social engineering or phishing techniques to manipulate victims into engaging with the dangerous link.

The following are the links to original references where you can find more information about this discovered vulnerability:

1. Official GitLab Security Release: https://about.gitlab.com/releases/2022/01/31/security-release-gitlab-17-11-7-released/
2. CVE Details: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-6446
3. NVD Listing: https://nvd.nist.gov/vuln/detail/CVE-2024-6446

As a user or administrator of GitLab, it is crucial to address this vulnerability immediately. To secure your GitLab environment, make sure to follow these essential steps:

1. Upgrade GitLab: Update your GitLab instance to the latest available version to eliminate this vulnerability. For GitLab versions 17.1 to 17.1.7, upgrade to 17.1.8 or later. For GitLab 17.2, update to version 17.2.5 or later. Lastly, for GitLab 17.3, ensure that you are running version 17.3.2 or newer.

2. Enable Two-Factor Authentication (2FA): Activating 2FA adds an extra layer of security to help protect your GitLab account from unauthorized access. This security measure requires both your password and a unique authentication code generated by an external mobile app to log in to your account.

3. Educate Employees: Teach your team members about social engineering tactics and how to recognize phishing emails. Encourage your employees to verify the authenticity of any suspicious links before clicking on them.

4. Regularly Monitor GitLab Logs: Closely monitor logs for any signs of suspicious activity, such as unauthorized access, modification of repositories, or unexpected user behavior.

Conclusion

The CVE-2024-6446 GitLab vulnerability poses a significant risk to users and administrators alike. By upgrading your GitLab instance, enabling 2FA, educating employees, and diligently monitoring logs, you can protect your environment from potential exploit and maintain the security of your GitLab deployment. Stay vigilant, keep your software updated, and always verify the authenticity of URLs or links before engaging with them.

Timeline

Published on: 09/12/2024 17:15:05 UTC
Last modified on: 09/14/2024 15:17:11 UTC