Executive Summary

The vulnerability in the MP3 Audio Player – Music Player, Podcast Player & Radio by Sonaar WordPress plugin is a Server-Side Request Forgery (SSRF) issue affecting versions 5.3 to 5.10. It occurs via the 'load_lyrics_ajax_callback' function, allowing authenticated users with author-level access or higher to make web requests from the web application to arbitrary locations. This can be exploited to query and modify information from internal services that are otherwise not accessible.

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Impact Analysis

This SSRF vulnerability can allow attackers with author-level access to make unauthorized web requests from the vulnerable WordPress site to internal or external systems. This can lead to unauthorized querying or modification of internal service information, potentially exposing sensitive data or enabling further attacks within the internal network.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': "This vulnerability involves the 'load_lyrics_ajax_callback' function in the Sonaar MP3 Audio Player WordPress plugin versions 5.3 to 5.10, which allows authenticated users with author-level access or higher to perform server-side request forgery (SSRF). Detection can focus on monitoring AJAX requests to the plugin's endpoints, especially those invoking 'load_lyrics_ajax_callback'."}, {'type': 'paragraph', 'content': 'You can detect attempts by inspecting web server logs or using network monitoring tools to identify unusual or unauthorized AJAX requests originating from authenticated users with author or higher privileges.'}, {'type': 'paragraph', 'content': 'Suggested commands include searching web server logs for AJAX calls related to the plugin, for example:'}, {'type': 'list_item', 'content': "grep 'admin-ajax.php' /var/log/apache2/access.log | grep 'load_lyrics_ajax_callback'"}, {'type': 'list_item', 'content': "grep 'wp-admin/admin-ajax.php' /var/log/nginx/access.log | grep 'load_lyrics_ajax_callback'"}, {'type': 'paragraph', 'content': "Additionally, monitoring authenticated user activity with author-level or higher privileges for unusual requests to internal or external URLs via the plugin's AJAX endpoints can help detect exploitation attempts."}] [1]

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Mitigation Strategies

The immediate mitigation step is to update the Sonaar MP3 Audio Player WordPress plugin to version 5.11 or later, where the vulnerability has been addressed by adding rigorous input validation, enforcing permission checks, sanitizing outputs, and improving error handling in the AJAX callbacks.

If updating immediately is not possible, restrict author-level and higher user access to trusted users only, and monitor AJAX requests to the plugin endpoints for suspicious activity.

Additionally, consider implementing web application firewall (WAF) rules to block unauthorized AJAX requests targeting the vulnerable functions.

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