CVE-2021-40693 : Security Advisory and Response

This article provides details about CVE-2021-40693, an authentication bypass vulnerability affecting Moodle.

Understanding CVE-2021-40693

CVE-2021-40693 is a security vulnerability that poses an authentication bypass risk in Moodle's external database authentication feature.

What is CVE-2021-40693?

Type juggling vulnerability identified in Moodle's external database authentication functionality

The Impact of CVE-2021-40693

Allows attackers to bypass authentication mechanisms

Technical Details of CVE-2021-40693

This section covers the technical aspects of the CVE.

Vulnerability Description

Authentication bypass risk due to a type juggling vulnerability

Affected Systems and Versions

Product: Moodle
Versions Affected: 3.11 to 3.11.2, 3.10 to 3.10.6, 3.9 to 3.9.9, and earlier unsupported versions

Exploitation Mechanism

Attackers exploit the type juggling vulnerability to bypass authentication mechanisms

Mitigation and Prevention

Explore the steps to mitigate the CVE-2021-40693 vulnerability.

Immediate Steps to Take

Upgrade Moodle to the latest version
Monitor and review authentication logs for suspicious activities
Implement multi-factor authentication

Long-Term Security Practices

Conduct regular security assessments and audits
Train users on secure authentication practices
Keep systems and software up to date

Patching and Updates

Apply security patches provided by Moodle