CVE-2019-20389 : Exploit Details and Defense Strategies

A vulnerability in the Subrion CMS 4.2.1 /panel/configuration/general settings page allows remote attackers to insert malicious JavaScript code.

Understanding CVE-2019-20389

This CVE identifies a cross-site scripting (XSS) vulnerability in Subrion CMS 4.2.1.

What is CVE-2019-20389?

This vulnerability enables a remote attacker to inject JavaScript code through the v[language_switch] parameter, leading to code execution in the user's browser.

The Impact of CVE-2019-20389

The injected code can be displayed in a user's browser without proper output encoding, potentially leading to various attacks like data theft or unauthorized actions.

Technical Details of CVE-2019-20389

This section provides more technical insights into the vulnerability.

Vulnerability Description

An XSS issue was discovered in Subrion CMS 4.2.1, allowing attackers to inject arbitrary JavaScript code through a specific parameter.

Affected Systems and Versions

Affected Version: Subrion CMS 4.2.1

Exploitation Mechanism

The vulnerability occurs when a remote attacker manipulates the v[language_switch] parameter within multipart/form-data to execute malicious JavaScript code.

Mitigation and Prevention

Protecting systems from CVE-2019-20389 requires immediate actions and long-term security practices.

Immediate Steps to Take

Disable the affected functionality if possible
Implement input validation to sanitize user inputs
Regularly monitor and audit web application logs for suspicious activities

Long-Term Security Practices

Keep software up to date with the latest security patches
Educate developers on secure coding practices
Conduct regular security assessments and penetration testing

Patching and Updates

Ensure that Subrion CMS is updated to a patched version that addresses the XSS vulnerability.