CVE-2021-39329 : Exploit Details and Defense Strategies

This article provides an overview of CVE-2021-39329, a vulnerability in the JobBoardWP WordPress plugin that could allow for Stored Cross-Site Scripting attacks.

Understanding CVE-2021-39329

CVE-2021-39329 is an authenticated Stored Cross-Site Scripting vulnerability in JobBoardWP version 1.0.7.

What is CVE-2021-39329?

The JobBoardWP WordPress plugin is susceptible to Stored Cross-Site Scripting due to inadequate input validation and sanitization in the ~/includes/admin/class-metabox.php file. This flaw permits attackers with administrative user access to inject malicious web scripts in versions up to and including 1.0.7.

The Impact of CVE-2021-39329

The vulnerability affects multi-site installations when unfiltered_html is disabled for administrators or on sites where unfiltered_html is turned off.

Technical Details of CVE-2021-39329

This section delves into specific technical aspects of the vulnerability.

Vulnerability Description

JobBoardWP version 1.0.7 is vulnerable to Stored Cross-Site Scripting due to insufficient input validation in specific parameters.

Affected Systems and Versions

Product: JobBoardWP
Vendor: JobBoardWP
Versions Affected: 1.0.7 (custom version)

Exploitation Mechanism

The flaw enables attackers with high privileges to execute arbitrary web scripts through specific parameters.

Mitigation and Prevention

Protect your systems against CVE-2021-39329 with the following measures:

Immediate Steps to Take

Uninstall the JobBoardWP plugin from affected sites.

Long-Term Security Practices

Regularly monitor and update plugins to fix vulnerabilities.
Implement strong input validation and data sanitization practices.

Patching and Updates

Stay informed about security patches and updates for plugins to address known vulnerabilities.