CVE-2019-14831 Explained : Impact and Mitigation

A vulnerability has been discovered in Moodle versions 3.7 to 3.7.1, 3.6 to 3.6.5, 3.5 to 3.5.7, and earlier unsupported versions, involving an open redirect in the forum subscribe link.

Understanding CVE-2019-14831

This CVE identifies a security flaw in Moodle that allows for an open redirect in the forum subscribe link under specific conditions.

What is CVE-2019-14831?

The vulnerability in Moodle versions 3.5 to 3.7.1 and unsupported versions allows an open redirect in the forum subscribe link when forced subscription mode is enabled.

The Impact of CVE-2019-14831

This vulnerability could be exploited by attackers to redirect users to malicious websites, potentially leading to phishing attacks or the installation of malware.

Technical Details of CVE-2019-14831

The technical aspects of the CVE provide insight into the specific vulnerability and its implications.

Vulnerability Description

The vulnerability allows for an open redirect in the forum subscribe link when the forced subscription mode is active in Moodle.

Affected Systems and Versions

Moodle versions 3.7 to 3.7.1
Moodle versions 3.6 to 3.6.5
Moodle versions 3.5 to 3.5.7
Earlier unsupported versions of Moodle

Exploitation Mechanism

When a forum's subscription mode is set to "forced subscription," the subscribe link for the forum becomes vulnerable to an open redirect attack.

Mitigation and Prevention

To address and prevent the exploitation of CVE-2019-14831, certain steps and practices can be implemented.

Immediate Steps to Take

Upgrade Moodle to a patched version that addresses the open redirect vulnerability.
Disable the forced subscription mode in forums to mitigate the risk of exploitation.

Long-Term Security Practices

Regularly update Moodle to the latest supported version to ensure security patches are applied.
Educate users about phishing attacks and the importance of verifying URLs before clicking.

Patching and Updates

Ensure timely installation of security patches and updates provided by Moodle to address known vulnerabilities.