CVE-2021-23836 Explained : Impact and Mitigation

An issue was discovered in flatCore before 2.0.0 build 139 that allows a stored XSS vulnerability via the prefs_smtp_psw HTTP request body parameter. This vulnerability enables an admin user to inject malicious scripts, which get executed in the user's browser upon visiting the affected module page.

Understanding CVE-2021-23836

This section delves into the details of the vulnerability, its impact, technical aspects, and mitigation strategies.

What is CVE-2021-23836?

The vulnerability in flatCore before 2.0.0 build 139 allows admin users to execute stored XSS attacks by injecting malicious scripts through the prefs_smtp_psw HTTP request body parameter in the acp interface, affecting user browsers.

The Impact of CVE-2021-23836

The impact of this vulnerability is significant as it enables admin users to inject and execute malicious client-side scripts in the browsers of unsuspecting users visiting the affected module page, potentially leading to various security threats.

Technical Details of CVE-2021-23836

Let's explore the technical aspects of this vulnerability in more detail.

Vulnerability Description

The flaw lies in the lack of input sanitization for the prefs_smtp_psw HTTP request body parameter in the acp interface, enabling admin users to inject harmful client-side scripts.

Affected Systems and Versions

The vulnerability affects flatCore versions before 2.0.0 build 139, putting all users of these versions at risk of XSS attacks.

Exploitation Mechanism

By exploiting the vulnerability in the prefs_smtp_psw parameter, admin users can embed malicious scripts that execute when a user accesses the affected module page.

Mitigation and Prevention

Discover the immediate steps to take and long-term security practices to mitigate the risks associated with CVE-2021-23836.

Immediate Steps to Take

It is recommended to apply security patches, update to the latest version of the software, and restrict admin access to reduce the likelihood of exploitation.

Long-Term Security Practices

Implement security best practices such as input validation, output encoding, and user input sanitization to prevent XSS vulnerabilities in the long run.

Patching and Updates

Stay informed about security updates released by flatCore, promptly apply patches to fix known vulnerabilities, and maintain vigilance to ensure the overall security of your system.