CVE-2018-19421 Explained : Impact and Mitigation

Get insights into the security vulnerability in GetSimpleCMS 3.3.15 that allows the display of HTML elements in .eml files.

Understanding CVE-2018-19421

This CVE involves a security issue in the upload functionality of GetSimpleCMS 3.3.15, specifically related to the handling of file types.

What is CVE-2018-19421?

The vulnerability in GetSimpleCMS 3.3.15 allows Internet Explorer to render HTML elements within .eml files due to the upload functionality restrictions.

The Impact of CVE-2018-19421

The vulnerability can lead to potential security risks by allowing the display of HTML content within .eml files, which may be exploited by attackers.

Technical Details of CVE-2018-19421

Explore the technical aspects of this CVE.

Vulnerability Description

The issue lies in the admin/upload.php file of GetSimpleCMS 3.3.15, which restricts .html file uploads but fails to prevent Internet Explorer from displaying HTML elements in .eml files.

Affected Systems and Versions

Product: GetSimpleCMS
Version: 3.3.15

Exploitation Mechanism

The problem arises from the code within the admin/upload-uploadify.php file and the validation process executed by validate_safe_file in admin/inc/security_functions.php.

Mitigation and Prevention

Discover the steps to mitigate and prevent exploitation of this vulnerability.

Immediate Steps to Take

Implement strict file type validation to prevent the upload of potentially harmful files.
Educate users about the risks associated with opening files from untrusted sources.

Long-Term Security Practices

Regularly update GetSimpleCMS to the latest version to patch known vulnerabilities.
Conduct security audits to identify and address any potential security loopholes.

Patching and Updates

Ensure timely installation of security patches and updates provided by GetSimpleCMS to address this vulnerability.