CVE-2019-19493 : Security Advisory and Response

Kentico versions prior to 12.0.50 have a vulnerability that allows file uploads where the Content-Type header does not match the file extension, resulting in a cross-site scripting (XSS) attack.

Understanding CVE-2019-19493

Kentico before version 12.0.50 is susceptible to a security flaw that permits file uploads with inconsistent Content-Type headers, potentially leading to XSS attacks.

What is CVE-2019-19493?

This CVE identifies a vulnerability in Kentico versions before 12.0.50 that enables malicious actors to upload files with mismatched Content-Type headers, creating a security risk for cross-site scripting attacks.

The Impact of CVE-2019-19493

The vulnerability in Kentico versions prior to 12.0.50 could allow attackers to execute cross-site scripting attacks by uploading files with incorrect Content-Type headers, potentially compromising the security and integrity of the system.

Technical Details of CVE-2019-19493

Kentico CMS versions before 12.0.50 are affected by a file upload vulnerability that can be exploited for XSS attacks.

Vulnerability Description

The vulnerability in Kentico CMS allows file uploads where the Content-Type header does not match the file extension, opening the door for cross-site scripting attacks.

Affected Systems and Versions

Product: Kentico CMS
Versions Affected: Prior to 12.0.50

Exploitation Mechanism

Attackers can exploit this vulnerability by uploading files with mismatched Content-Type headers, tricking the system into processing them as different file types and potentially executing malicious scripts.

Mitigation and Prevention

To address CVE-2019-19493, follow these mitigation steps:

Immediate Steps to Take

Upgrade to Kentico version 12.0.50 or newer to eliminate the vulnerability.
Implement strict file upload validation to ensure Content-Type headers match file extensions.

Long-Term Security Practices

Regularly monitor and update security patches for Kentico CMS.
Educate users on safe file upload practices to prevent XSS vulnerabilities.

Patching and Updates

Apply the latest patches and updates provided by Kentico to secure the system against known vulnerabilities.