Unauthenticated PHP Object Injection in Ajax Search Lite

Executive Summary

This is an unauthenticated PHP Object Injection vulnerability in the Ajax Search Lite WordPress plugin versions 4.14.4 and below. It allows attackers to inject malicious PHP objects without authentication, potentially leading to code execution, SQL injection, or other attacks if a suitable POP chain exists.

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Detection Guidance

Detecting this vulnerability requires checking if the Ajax Search Lite plugin version 4.14.4 or below is installed on your WordPress site. You can use commands like 'wp plugin list' in WP-CLI or inspect the plugin directory for version details. Additionally, monitor for unusual activity such as unexpected code execution or database queries.

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Impact Analysis

This vulnerability can allow attackers to execute arbitrary code, manipulate databases, access sensitive data, or disrupt services on your website. Since it requires no authentication, it poses a high risk to all websites using vulnerable versions of the plugin.

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Mitigation Strategies

Immediately update the Ajax Search Lite plugin to version 4.14.5 or later. If updating is not possible, apply the mitigation rule provided by Patchstack to block attacks until the update is applied. Remove the plugin if no longer needed.

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