Email Relay Vulnerability in Estatik Real Estate Plugin

Executive Summary

The Estatik Real Estate Plugin for WordPress before version 4.3.3 has a flaw where it does not properly enforce anti-spam checks or restrict recipient routing in its property request form. This allows unauthenticated users to send emails to any recipient with customizable subject, body, and Reply-To fields, effectively using the website as a mail relay for spam or phishing campaigns.

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Detection Guidance

To detect this vulnerability, check if your WordPress site is running the Estatik Real Estate Plugin version before 4.3.3. You can use the WordPress admin panel to view the plugin version or run the command 'wp plugin list' in the WordPress root directory if using WP-CLI. Additionally, monitor outgoing email logs for unusual activity such as emails sent to arbitrary recipients via the property request form.

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Impact Analysis

This vulnerability can allow attackers to send spam or phishing emails through your website without authentication. It may lead to your site being blacklisted by email providers, damage your reputation, and consume server resources. Additionally, it could be used to trick recipients into disclosing sensitive information.

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Compliance Impact

This vulnerability could lead to non-compliance with GDPR if personal data is mishandled through phishing emails sent via the site. For HIPAA, if the plugin is used in a healthcare context, unauthorized email relaying could expose protected health information, violating confidentiality requirements.

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Mitigation Strategies

Immediately update the Estatik Real Estate Plugin to version 4.3.3 or later. If updating is not possible, consider disabling the plugin temporarily until an update is applied. Review and restrict outgoing email functionality on the server to prevent abuse. Monitor email logs for suspicious activity during this period.

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