CVE-2021-23814 : Exploit Details and Defense Strategies

A detailed overview of CVE-2021-23814, which involves Arbitrary File Upload vulnerability in unisharp/laravel-filemanager package.

Understanding CVE-2021-23814

This CVE refers to a security issue in the unisharp/laravel-filemanager package that allows attackers to upload malicious files leading to Remote Code Execution.

What is CVE-2021-23814?

CVE-2021-23814 involves the upload() function in the unisharp/laravel-filemanager package, which lacks proper validation for file types during file uploads.

The Impact of CVE-2021-23814

The vulnerability allows an attacker to execute remote code by uploading a malicious file using the Laravel application upload feature.

Technical Details of CVE-2021-23814

A closer look at the vulnerability's description, affected systems, and how exploitation occurs.

Vulnerability Description

The upload function in unisharp/laravel-filemanager does not validate file types adequately, enabling an attacker to upload a malicious file for Remote Code Execution.

Affected Systems and Versions

The issue impacts unisharp/laravel-filemanager version 0.0.0, where the upload function is susceptible to malicious file uploads.

Exploitation Mechanism

By manipulating the request content during file upload, an attacker can substitute an uploaded image with a malicious file, triggering Remote Code Execution.

Mitigation and Prevention

Effective steps to mitigate and prevent the CVE-2021-23814 vulnerability in unisharp/laravel-filemanager.

Immediate Steps to Take

Implement whitelisting for file extensions in the configuration file to prevent malicious file uploads via the upload function.

Long-Term Security Practices

Regularly review and update security configurations, conduct security audits, and educate users on safe uploading practices.

Patching and Updates

Apply patches released by the package maintainers, stay informed about security updates, and ensure timely installation to mitigate security risks.