CVE-2019-5464 : Exploit Details and Defense Strategies

A vulnerability in GitLab CE/EE versions 10.2 and above could lead to SSRF attacks due to a flaw in DNS rebinding protection.

Understanding CVE-2019-5464

An issue with DNS rebinding protection in GitLab CE/EE versions 10.2 and later could result in SSRF attacks.

What is CVE-2019-5464?

A flaw in the

url_blocker.rb

file in GitLab CE/EE versions 10.2 and above could allow SSRF attacks when the affected library is used.

The Impact of CVE-2019-5464

This vulnerability could potentially lead to SSRF (Server-Side Request Forgery) attacks when the affected library is utilized.

Technical Details of CVE-2019-5464

Vulnerability Description

The vulnerability lies in the flawed DNS rebinding protection issue in GitLab CE/EE versions 10.2 and later, specifically in the

url_blocker.rb

file.

Affected Systems and Versions

Product: GitLab CE/EE
Vendor: GitLab
Versions Affected: GitLab CE/EE 10.2 and later
Fixed Versions: 12.1.2, 12.0.4, and 11.11.6

Exploitation Mechanism

The vulnerability could be exploited to conduct SSRF attacks when the affected library is used.

Mitigation and Prevention

Immediate Steps to Take

Update GitLab CE/EE to version 12.1.2 or later to mitigate the vulnerability.
Monitor and restrict network access to prevent SSRF attacks.

Long-Term Security Practices

Regularly update and patch software to address security vulnerabilities.
Implement proper input validation mechanisms to prevent similar issues.

Patching and Updates

Apply security patches provided by GitLab promptly to ensure protection against known vulnerabilities.