CVE-2023-4224 : Exploit Details and Defense Strategies

This CVE-2023-4224 was published by STAR_Labs on November 28, 2023, and it addresses a vulnerability in Chamilo LMS version 1.11.24 and below. The vulnerability allows authenticated attackers with a learner role to achieve remote code execution through unrestricted file upload.

Understanding CVE-2023-4224

This vulnerability in Chamilo LMS poses a significant risk as it enables attackers with specific roles to upload PHP files and execute remote code on the affected system.

What is CVE-2023-4224?

The CVE-2023-4224 vulnerability in Chamilo LMS version 1.11.24 and earlier versions allows authenticated attackers with a learner role to exploit unrestricted file upload functionality in

/main/inc/ajax/dropbox.ajax.php

. This can lead to remote code execution by uploading PHP files, posing a severe security threat.

The Impact of CVE-2023-4224

The impact of CVE-2023-4224 is classified as high, with a CVSSv3.1 base score of 8.8. The confidentiality, integrity, and availability of the system are highly impacted, making it crucial to address this vulnerability promptly.

Technical Details of CVE-2023-4224

This section delves deeper into the technical aspects of the CVE-2023-4224 vulnerability.

Vulnerability Description

The vulnerability arises from unrestricted file upload in

/main/inc/ajax/dropbox.ajax.php

in Chamilo LMS version 1.11.24 and earlier. Attackers with a learner role can exploit this to upload PHP files and execute remote code on the affected system.

Affected Systems and Versions

Chamilo LMS versions 1.11.24 and below are affected by CVE-2023-4224 due to the unrestricted file upload functionality in a specific file path.

Exploitation Mechanism

Authenticated attackers with a learner role can leverage the unrestricted file upload feature to upload malicious PHP files, enabling them to execute arbitrary remote code and potentially compromise the system.

Mitigation and Prevention

To safeguard systems from potential exploitation of CVE-2023-4224, it is crucial to implement appropriate mitigation strategies.

Immediate Steps to Take

Update Chamilo LMS to a patched version that addresses the vulnerability.
Monitor user roles and permissions to prevent unauthorized access and exploitation.
Educate users about safe file upload practices to mitigate the risk of uploading malicious files.

Long-Term Security Practices

Regularly conduct security audits and assessments to identify and address vulnerabilities proactively.
Implement secure coding practices to prevent similar vulnerabilities in the future.
Stay informed about security advisories and promptly apply patches and updates to mitigate risks effectively.

Patching and Updates

Chamilo LMS has released patches to address CVE-2023-4224. It is recommended to apply these patches promptly to secure systems against potential remote code execution attacks.