CVE-2021-39927 : Vulnerability Insights and Analysis

Server-side request forgery (ssrf) vulnerability in GitLab versions between 8.4 and 14.6.1.

Understanding CVE-2021-39927

The vulnerability allows attackers to bypass SSRF protections in GitLab, potentially leading to security breaches.

What is CVE-2021-39927?

GitLab CE/EE versions between 8.4 and 14.6.1 are susceptible to SSRF attacks.
Attackers can send requests to localhost on port 80 or 443 even if GitLab runs on a different port.

The Impact of CVE-2021-39927

CVSS Base Score: 3.5 (Low Severity)
Attack Vector: Network
Attack Complexity: High
Confidentiality Impact: Low
Integrity Impact: None

Technical Details of CVE-2021-39927

GitLab versions affected, exploit mechanisms, and more.

Vulnerability Description

SSRF protections in GitLab versions between 8.4 and 14.6.1 are inadequate.

Affected Systems and Versions

Affected Product: GitLab
Vulnerable Versions: >=8.4, <14.6.1

Exploitation Mechanism

Attackers send requests to localhost on port 80 or 443, bypassing SSRF protections.

Mitigation and Prevention

Actions to secure systems against CVE-2021-39927.

Immediate Steps to Take

Upgrade GitLab to version 14.6.2 or higher to patch the vulnerability.
Monitor network traffic for suspicious requests to localhost.

Long-Term Security Practices

Implement network segmentation to restrict server access.
Regularly update and patch GitLab installations.
Conduct security audits to identify and mitigate SSRF risks.

Patching and Updates

GitLab has released patches for versions 14.6.2 and above to address the vulnerability.