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CVE-2023-4226 Explained : Impact and Mitigation

Critical CVE-2023-4226 impacts Chamilo LMS, allowing remote code execution. Learn about the vulnerability, its impact, and mitigation steps.

This CVE record outlines a critical vulnerability identified as "Chamilo LMS File Upload Functionality Remote Code Execution."

Understanding CVE-2023-4226

This vulnerability was discovered in Chamilo Learning Management System (LMS) version 1.11.24 or below. It allows authenticated attackers with learner roles to execute remote code by uploading PHP files through the

/main/inc/ajax/work.ajax.php
functionality.

What is CVE-2023-4226?

The CVE-2023-4226 vulnerability in Chamilo LMS enables attackers with learner role access to upload PHP files, thereby leading to remote code execution on the targeted system.

The Impact of CVE-2023-4226

The impact of this vulnerability is rated as high, with a CVSS v3.1 base score of 8.8. It affects confidentiality, integrity, and availability, making it a critical security concern. The specific CAPEC related to this vulnerability is CAPEC-650, which involves uploading a web shell to a web server.

Technical Details of CVE-2023-4226

This section delves into the specifics of the vulnerability, including its description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The unrestricted file upload vulnerability in Chamilo LMS version 1.11.24 or below allows authenticated attackers with learner roles to upload PHP files via

/main/inc/ajax/work.ajax.php
, resulting in remote code execution.

Affected Systems and Versions

Only Chamilo LMS versions equal to or below 1.11.24 are impacted by this vulnerability. Users of these versions should take immediate action to mitigate the risk.

Exploitation Mechanism

Attackers with authenticated access and learner roles can exploit this vulnerability by uploading malicious PHP files using the compromised

/main/inc/ajax/work.ajax.php
functionality.

Mitigation and Prevention

Mitigating CVE-2023-4226 involves taking immediate steps to secure systems and implementing long-term security measures.

Immediate Steps to Take

Users of Chamilo LMS should apply the provided patches promptly to address this vulnerability. Additionally, restricting file upload permissions and monitoring uploads can help prevent exploitation.

Long-Term Security Practices

Implementing secure coding practices, conducting regular security assessments, and educating users on safe upload behaviors are essential for preventing similar vulnerabilities in the future.

Patching and Updates

The Chamilo project has released patches to address CVE-2023-4226. Users are strongly advised to apply these patches immediately to secure their systems. The provided patches can be found on the official GitHub repository of Chamilo LMS.

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