Ensure default error and index.html pages do not reference NGINX

Cómo se verifica

Método de auditoría: Revisión manual

Esta recomendación no se puede verificar automáticamente. Un escaneo la lista con estas instrucciones cuando se pasa --include-manual.

1. Verify Config: Check if error_page directives are active: nginx -T 2>/dev/null | grep -i "error_page" 2. Verify Content (Functional Test): Trigger an error (e.g., request a non-existent page) and inspect the body: curl -k https://127.0.0.1/non-existent-page | grep -i "nginx" Evaluation: PASS: The output does not contain "nginx" (or grep returns nothing). FAIL: The HTML body contains "nginx".

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

Instead of editing the default files (which may be overwritten by package updates), configure NGINX to use custom error pages. 1. Create Custom Error Pages: Create a directory (e.g., /var/www/html/errors) and place generic HTML files there (e.g., 404.html, 50x.html) without NGINX branding. 2. Configure NGINX: Add the error_page directive to your http or server blocks: error_page 404 /404.html; error_page 500 502 503 504 /50x.html; location = /50x.html { root /var/www/html/errors; internal; }