Compliance Impact

The vulnerability in WordPress Booking Calendar Contact Form 1.0.23 allows authenticated users with subscriber-level access to escalate privileges and inject malicious scripts that execute in administrator browsers. This can lead to unauthorized modification of plugin options and execution of arbitrary JavaScript, potentially compromising the integrity and confidentiality of the affected system.

Such unauthorized access and potential data manipulation or exposure could negatively impact compliance with common standards and regulations like GDPR and HIPAA, which require protection of personal data and secure access controls. However, the provided information does not explicitly detail the direct impact on these regulations.

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Impact Analysis

This vulnerability can allow attackers with low-level (subscriber) access to escalate their privileges and modify plugin settings.

It also enables attackers to inject malicious scripts that execute arbitrary JavaScript in administrator browsers, potentially leading to unauthorized actions, data theft, or further compromise of the website.

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Executive Summary

WordPress Booking Calendar Contact Form version 1.0.23 contains vulnerabilities involving privilege escalation and stored cross-site scripting (XSS).

The plugin fails to properly verify user permissions and sanitize input parameters, which allows authenticated users with subscriber-level access to modify plugin options and inject malicious scripts.

Attackers can exploit this by sending specially crafted requests through parameters such as price, name, calendar_language, and email_confirmation_to_user via the admin-ajax.php and admin.php endpoints.

Successful exploitation results in the execution of arbitrary JavaScript code in the browsers of administrators who view the affected site.

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Detection Guidance

This vulnerability can be detected by monitoring for suspicious requests targeting the admin-ajax.php and admin.php endpoints of the WordPress Booking Calendar Contact Form plugin, specifically those containing parameters such as price, name, calendar_language, and email_confirmation_to_user.

Commands to detect potential exploitation attempts could include searching web server logs for requests with these parameters or unusual POST data from authenticated subscriber-level users.

• Use grep or similar tools to search access logs for suspicious parameter usage, e.g., grep -i 'price=' /var/log/apache2/access.log
• Monitor for POST requests to admin-ajax.php or admin.php containing XSS payload patterns or unusual script tags.

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Mitigation Strategies

Immediate mitigation steps include updating the WordPress Booking Calendar Contact Form plugin to a version later than 1.0.23 where this vulnerability is fixed.

If an update is not immediately possible, restrict access to the admin-ajax.php and admin.php endpoints to trusted users only and review user privileges to ensure that subscriber-level accounts cannot modify plugin options.

Additionally, monitor and sanitize inputs on these endpoints to prevent injection of malicious scripts.

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