CVE-2021-43559 : Exploit Details and Defense Strategies

A flaw was discovered in Moodle versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10, and earlier unsupported versions, leading to a CSRF risk in the 'delete related badge' functionality.

Understanding CVE-2021-43559

What is CVE-2021-43559?

This CVE identifies a vulnerability in Moodle versions that could allow for CSRF attacks due to a missing token check in the 'delete related badge' feature.

The Impact of CVE-2021-43559

The presence of this vulnerability could potentially lead to unauthorized actions, data manipulation, and risks to the integrity of Moodle instances.

Technical Details of CVE-2021-43559

Vulnerability Description

The 'delete related badge' function lacked a required token check, opening the door to potential CSRF attacks.

Affected Systems and Versions

Moodle 3.11 to 3.11.3
Moodle 3.10 to 3.10.7
Moodle 3.9 to 3.9.10

Exploitation Mechanism

Attacks could be carried out through CSRF techniques due to insufficient token validation in the 'delete related badge' functionality.

Mitigation and Prevention

Immediate Steps to Take

Update Moodle to the latest patched version immediately.
Restrict access to the 'delete related badge' feature until the system is updated.

Long-Term Security Practices

Implement regular security assessments and audits for Moodle installations.
Educate users about CSRF risks and best practices for secure usage.

Patching and Updates

Apply the latest security patches and updates released by Moodle to address this vulnerability.