Executive Summary

The Robo Gallery plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in its 'Loading Label' setting in all versions up to and including 5.1.3.

The plugin uses a custom marker pattern `|***...***|` in its `fixJsFunction()` method to embed raw JavaScript function references inside JSON-encoded configuration objects. When the gallery options are rendered on the frontend, the JSON strings are wrapped in quotes, but the `fixJsFunction()` method strips these quote markers, turning the string into executable JavaScript code.

The 'Loading Label' field is sanitized with `sanitize_text_field()` which removes HTML tags but does not remove the `|***...***|` markers. This allows an attacker with Author-level access or higher to input malicious JavaScript code inside these markers, which is stored and later executed in the browser when a user views the gallery.

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Impact Analysis

This vulnerability allows authenticated users with Author-level permissions or higher to inject arbitrary JavaScript code into pages containing the gallery shortcode.

As a result, any visitor to those pages could have malicious scripts executed in their browsers, potentially leading to theft of cookies, session hijacking, defacement, or other malicious actions.

Because the vulnerability is stored (persistent), the malicious code remains active until removed, affecting all users who visit the affected pages.

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Compliance Impact

The vulnerability allows authenticated users with Author-level access to inject arbitrary JavaScript code into pages containing the gallery shortcode. This can lead to stored cross-site scripting (XSS) attacks, potentially exposing user data or session information to attackers.

Such unauthorized script execution can compromise the confidentiality and integrity of user data, which may impact compliance with data protection regulations like GDPR and HIPAA that require safeguarding personal and sensitive information against unauthorized access or disclosure.

However, the provided information does not explicitly detail the direct compliance implications or specific regulatory impacts of this vulnerability.

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Detection Guidance

This vulnerability involves the Robo Gallery WordPress plugin storing and rendering malicious JavaScript via the 'Loading Label' setting. Detection involves checking for the presence of the plugin and inspecting the 'rbs_gallery_LoadingWord' post_meta field for suspicious patterns.

• Check if the Robo Gallery plugin is installed and its version is 5.1.3 or below.
• Search the WordPress database for the 'rbs_gallery_LoadingWord' meta key containing the marker pattern '|***...***|', which indicates potential exploitation.
• Example MySQL command to find suspicious entries: SELECT post_id, meta_value FROM wp_postmeta WHERE meta_key = 'rbs_gallery_LoadingWord' AND meta_value LIKE '%|***%***|%';
• Review pages or posts containing the gallery shortcode for unexpected inline scripts or JavaScript execution.

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Mitigation Strategies

To mitigate this vulnerability, immediate actions should focus on preventing exploitation and removing any malicious code.

• Update the Robo Gallery plugin to a version later than 5.1.3 where this vulnerability is fixed.
• Temporarily disable or remove the Robo Gallery plugin if an update is not immediately available.
• Audit and clean the 'rbs_gallery_LoadingWord' post_meta entries to remove any values containing the '|***...***|' markers.
• Restrict Author-level user permissions to prevent unauthorized creation or modification of galleries until the issue is resolved.
• Monitor your site for suspicious JavaScript execution and unauthorized content injections.

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