Authorization Bypass in NEX-Forms WordPress Plugin

Executive Summary

The vulnerability exists in the NEX-Forms – Ultimate Forms Plugin for WordPress, affecting all versions up to and including 9.2.2. It is an authorization bypass issue caused by the plugin failing to properly verify whether a user is authorized to perform certain actions.

Because of this flaw, unauthenticated attackers can enumerate sequential report IDs and download complete form submission data from the site.

The exposed data can include sensitive information such as names, email addresses, phone numbers, postal addresses, payment details, and uploaded file paths.

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Detection Guidance

This vulnerability involves unauthorized access to sequential report IDs in the NEX-Forms – Ultimate Forms Plugin for WordPress, allowing attackers to download form submission data without proper authorization.

To detect this vulnerability on your system or network, you can monitor HTTP requests targeting the plugin's report download endpoints, especially those attempting to access sequential report IDs without authentication.

Commands to help detect potential exploitation attempts might include using web server logs or network monitoring tools to search for suspicious URL patterns or unauthorized access attempts.

• Use grep or similar tools on web server logs to find requests to report download URLs, e.g., `grep -i 'nex-forms.*report' /var/log/apache2/access.log`
• Use curl or wget to test access to report URLs without authentication, e.g., `curl -I http://example.com/wp-content/plugins/ultimate-forms/reports/download.php?report_id=1` and increment report_id values to check for unauthorized access.
• Monitor network traffic for repeated GET requests to the plugin's report download endpoints with sequential report IDs.

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Impact Analysis

This vulnerability can lead to unauthorized disclosure of sensitive personal and payment information collected through forms on a WordPress site using the affected plugin.

Attackers can access private form submission data without authentication, potentially leading to privacy breaches, identity theft, financial fraud, and reputational damage for the site owner.

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Compliance Impact

This vulnerability allows unauthenticated attackers to access and download sensitive form submission data including names, email addresses, phone numbers, postal addresses, payment details, and uploaded file paths.

Such unauthorized access to personal and payment information can lead to non-compliance with data protection regulations like GDPR and HIPAA, which require strict controls on access to personal and sensitive data.

Therefore, exploitation of this vulnerability could result in violations of these standards due to improper authorization and potential data breaches.

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Mitigation Strategies

To mitigate this vulnerability immediately, you should update the NEX-Forms – Ultimate Forms Plugin for WordPress to a version later than 9.2.2 where the authorization bypass issue is fixed.

If an update is not immediately possible, restrict access to the plugin's report download endpoints by implementing authentication or IP-based access controls at the web server or application level.

Additionally, monitor logs for suspicious access attempts and consider temporarily disabling the plugin if sensitive data exposure risk is high.

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