CVE-2018-14631 Explained : Impact and Mitigation

Moodle versions 3.5.2, 3.4.5, and 3.3.8 are affected by a vulnerability in the Boost theme related to the blog search function, potentially leading to a reflected XSS attack.

Understanding CVE-2018-14631

The boost theme in Moodle versions 3.5.2, 3.4.5, and 3.3.8 has a security issue that could allow for a Cross-Site Scripting (XSS) attack.

What is CVE-2018-14631?

The vulnerability in the Boost theme of Moodle versions 3.5.2, 3.4.5, and 3.3.8 arises from inadequate filtering in the breadcrumb navigation feature, specifically in the blog search function. This flaw could be exploited through a malicious link containing JavaScript in the search parameter, potentially leading to a reflected XSS attack.

The Impact of CVE-2018-14631

The vulnerability has a CVSS v3.0 base score of 8.8, indicating a high severity issue with significant impacts on confidentiality, integrity, and availability of affected systems.

Technical Details of CVE-2018-14631

The technical aspects of the vulnerability in Moodle versions 3.5.2, 3.4.5, and 3.3.8.

Vulnerability Description

The Boost theme's breadcrumb navigation fails to adequately filter search results in the blog, creating an avenue for a reflected XSS attack if a user interacts with a malicious link.

Affected Systems and Versions

Moodle 3.5.2
Moodle 3.4.5
Moodle 3.3.8

Exploitation Mechanism

The vulnerability can be exploited when a user clicks on a crafted link that contains JavaScript in the search parameter, triggering the XSS attack.

Mitigation and Prevention

Steps to address and prevent the CVE-2018-14631 vulnerability.

Immediate Steps to Take

Update Moodle to a patched version that addresses the XSS vulnerability.
Educate users about the risks of clicking on unknown or suspicious links.

Long-Term Security Practices

Regularly monitor and update Moodle installations to ensure the latest security patches are applied.
Implement web application firewalls and input validation mechanisms to mitigate XSS risks.

Patching and Updates

Apply the security patches provided by Moodle to fix the vulnerability and enhance system security.