CVE-2018-19856 Explained : Impact and Mitigation

GitLab CE/EE versions prior to 11.3.12, 11.4.x before 11.4.10, and 11.5.x before 11.5.3 are vulnerable to Directory Traversal in Templates API.

Understanding CVE-2018-19856

This CVE involves a security issue in GitLab CE/EE versions that could allow Directory Traversal in Templates API.

What is CVE-2018-19856?

This vulnerability in GitLab CE/EE versions allows an attacker to perform Directory Traversal in Templates API, potentially leading to unauthorized access to sensitive files.

The Impact of CVE-2018-19856

The vulnerability could result in unauthorized access to critical files and data stored within the affected GitLab instances.

Technical Details of CVE-2018-19856

GitLab CE/EE versions prior to 11.3.12, 11.4.x before 11.4.10, and 11.5.x before 11.5.3 are susceptible to this security flaw.

Vulnerability Description

The vulnerability allows for Directory Traversal in Templates API, enabling attackers to access files outside the intended directory structure.

Affected Systems and Versions

GitLab CE/EE versions before 11.3.12
GitLab CE/EE 11.4.x before 11.4.10
GitLab CE/EE 11.5.x before 11.5.3

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating input to traverse directories and access files they are not authorized to view.

Mitigation and Prevention

It is crucial to take immediate steps to secure affected systems and implement long-term security measures.

Immediate Steps to Take

Update GitLab CE/EE to versions 11.3.12, 11.4.10, or 11.5.3 or newer to mitigate the vulnerability.
Monitor system logs for any suspicious activities indicating potential exploitation.

Long-Term Security Practices

Regularly update and patch software to address known vulnerabilities.
Implement access controls and restrictions to prevent unauthorized access to sensitive files.

Patching and Updates

Apply security patches provided by GitLab promptly to address the Directory Traversal vulnerability.