CVE-2023-30943 : Security Advisory and Response

A remote code execution vulnerability was discovered in Moodle versions 4.1 to 4.1.2, allowing an attacker to manipulate file paths and create arbitrary folders on the system.

Understanding CVE-2023-30943

This CVE relates to a security flaw in Moodle that enables unauthorized control over file paths in the application, leading to the creation of malicious directories.

What is CVE-2023-30943?

The vulnerability in CVE-2023-30943 is rooted in how Moodle handles file paths, granting a remote user the ability to craft a specific HTTP request and generate new folders on the targeted system.

The Impact of CVE-2023-30943

Exploiting this vulnerability could result in unauthorized access, data breaches, or even a complete compromise of the affected system. Attackers could potentially upload malicious files, escalate privileges, and execute arbitrary code.

Technical Details of CVE-2023-30943

In Moodle versions 4.1 to 4.1.2, the vulnerability exists due to insufficient input validation in the application's file path creation process. This oversight allows an attacker to manipulate paths and create directories at will.

Vulnerability Description

The flaw in CVE-2023-30943 arises from an improper check on user-controlled file paths within Moodle's TinyMCE loaders, enabling the injection of crafted requests to spawn arbitrary folders.

Affected Systems and Versions

Moodle versions 4.1 to 4.1.2 are susceptible to this vulnerability, putting all instances running these versions at risk of exploitation. Organizations using these versions should take immediate action to mitigate the threat.

Exploitation Mechanism

By sending a specially crafted HTTP request, a malicious actor can bypass Moodle's path restrictions, gaining the ability to create directories on the system and potentially execute unauthorized actions.

Mitigation and Prevention

To safeguard systems from CVE-2023-30943, users and administrators must implement immediate security measures and follow best practices to prevent similar exploits in the future.

Immediate Steps to Take

Organizations should update their Moodle installations to version 4.1.3, the release that addresses the vulnerability and includes necessary security patches. It is crucial to apply this update promptly to eliminate the risk of exploitation.

Long-Term Security Practices

Employing robust input validation mechanisms, monitoring file system activities, and maintaining a proactive security posture can help prevent similar file path manipulation attacks in the future.

Patching and Updates

Regularly applying software updates and security patches is essential to stay protected against emerging threats. Organizations should stay informed about security advisories and promptly apply patches provided by Moodle.