CVE-2019-19903 : Security Advisory and Response

A vulnerability was found in Backdrop CMS 1.14.x prior to version 1.14.2. The system lacks adequate filtering of output when presenting file type descriptions generated by administrators, potentially leading to Cross-Site Scripting (XSS) attacks.

Understanding CVE-2019-19903

This CVE identifies a security issue in Backdrop CMS versions before 1.14.2 that allows attackers to execute scripting commands by manipulating file type descriptions.

What is CVE-2019-19903?

The vulnerability in Backdrop CMS allows attackers to create custom descriptions and execute scripting commands when viewed by an administrator with specific permissions.

The Impact of CVE-2019-19903

Attackers can exploit this vulnerability to perform Cross-Site Scripting attacks by crafting malicious file type descriptions.
The vulnerability requires the attacker to have a role granting the permission to "Administer file types".

Technical Details of CVE-2019-19903

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The issue arises from inadequate output filtering in Backdrop CMS, enabling attackers to insert malicious scripts into file type descriptions.

Affected Systems and Versions

Backdrop CMS 1.14.x versions before 1.14.2 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by creating customized file type descriptions and tricking administrators into executing malicious scripts.

Mitigation and Prevention

Protect your system from CVE-2019-19903 with the following steps:

Immediate Steps to Take

Update Backdrop CMS to version 1.14.2 or later to patch the vulnerability.
Regularly review and monitor file type descriptions for any suspicious content.

Long-Term Security Practices

Educate administrators on the risks of executing scripts from untrusted sources.
Implement strict permission controls to limit access to critical functions like file type administration.

Patching and Updates

Stay informed about security updates and patches released by Backdrop CMS.
Apply updates promptly to ensure your system is protected against known vulnerabilities.