CVE-2021-39867 : Vulnerability Insights and Analysis

This CVE-2021-39867 article provides insights into a DNS rebinding vulnerability in GitLab affecting specific versions.

Understanding CVE-2021-39867

This section delves into the details of the CVE-2021-39867 vulnerability in GitLab.

What is CVE-2021-39867?

CVE-2021-39867 highlights a DNS rebinding vulnerability in GitLab versions >=8.15 and <14.3.1, allowing SSRF attacks.

The Impact of CVE-2021-39867

The vulnerability has a CVSS base score of 6.5, with a high integrity impact and a medium severity rating.

Technical Details of CVE-2021-39867

Explore the technical aspects of the CVE-2021-39867 vulnerability in GitLab.

Vulnerability Description

The issue allows attackers to trigger SSRF attacks through a DNS rebinding vulnerability in GitLab's Gitea Importer.

Affected Systems and Versions

Affected Product: GitLab
Vulnerable Versions:
=8.15 and <14.1.7

=14.2 and <14.2.5

=14.3 and <14.3.1

Exploitation Mechanism

The vulnerability can be exploited by exploiting the DNS rebinding flaw in GitLab, leading to potential SSRF attacks.

Mitigation and Prevention

Learn how to mitigate the risks associated with CVE-2021-39867 in GitLab.

Immediate Steps to Take

Upgrade GitLab to a non-vulnerable version.
Implement network-level protections against SSRF attacks.

Long-Term Security Practices

Conduct regular security assessments and audits.
Train developers on secure coding practices.

Patching and Updates

Stay updated with GitLab security advisories.
Apply security patches promptly to address vulnerabilities.