CVE-2019-19902 : Vulnerability Insights and Analysis

A vulnerability in Backdrop CMS versions 1.13.x before 1.13.5 and 1.14.x before 1.14.2 allows the upload of entire-site configuration archives, potentially enabling the upload of non-configuration scripts to the server.

Understanding CVE-2019-19902

What is CVE-2019-19902?

This CVE identifies a flaw in Backdrop CMS that permits the upload of archives with entire-site configurations, lacking proper validation, potentially leading to the upload of malicious scripts.

The Impact of CVE-2019-19902

The vulnerability could allow an attacker with specific permissions to upload harmful scripts to the server, although the execution of PHP scripts is prevented by the product.

Technical Details of CVE-2019-19902

Vulnerability Description

Backdrop CMS versions 1.13.x before 1.13.5 and 1.14.x before 1.14.2 are affected.
Uploading archives with entire-site configurations is possible, without adequate validation.
Attackers with the "Synchronize, import, and export configuration" permission could potentially upload non-configuration scripts.

Affected Systems and Versions

Backdrop CMS versions 1.13.x before 1.13.5 and 1.14.x before 1.14.2.

Exploitation Mechanism

Attackers need the specific permission mentioned above to exploit this vulnerability.
The product prevents the execution of PHP scripts, requiring another server-side scripting language for malicious code execution.

Mitigation and Prevention

Immediate Steps to Take

Update Backdrop CMS to versions 1.13.5 and 1.14.2 or later.
Restrict the "Synchronize, import, and export configuration" permission to trusted administrators.

Long-Term Security Practices

Regularly review and adjust user permissions to minimize risks.
Implement additional security measures to prevent unauthorized file uploads.

Patching and Updates

Apply patches and updates provided by Backdrop CMS to address this vulnerability.