Kirki Plugin URL Fetching Host Validation Bypass

Executive Summary

This vulnerability is in the Kirki WordPress plugin before version 6.3.2. It allows users with editor-level access or higher to make the website send requests to internal services that are normally unreachable. The plugin does not check the host of a URL before fetching it, so attackers can exploit this to probe internal systems and determine which ones are active based on the responses.

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Detection Guidance

To detect this vulnerability, check if your Kirki WordPress plugin version is below 6.3.2. Use commands like 'wp plugin list' in WordPress CLI or inspect the plugin files for version info. Monitor network logs for unusual internal requests originating from the plugin.

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Impact Analysis

If you use the vulnerable version of the Kirki plugin, attackers with editor access or higher could map your internal network by sending requests to internal services. This could reveal sensitive information about your systems and potentially lead to further attacks if internal services are compromised.

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Compliance Impact

This vulnerability may impact compliance by exposing internal systems, which could lead to unauthorized access or data breaches. GDPR requires protecting personal data, and HIPAA requires safeguarding health information. A breach or unauthorized access could result in violations and penalties.

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Mitigation Strategies

Update the Kirki WordPress plugin to version 6.3.2 or later to address the URL validation issue.

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