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

보통레벨 1수동 검토nginx

설명

Default error pages (e.g., 404, 500) and the default welcome page often contain NGINX branding or signatures. These pages should be removed or replaced with generic or custom-branded pages that do not disclose the underlying server technology. Manual review: the benchmark gives no reliable automated check for this control.

점검 방법

감사 방식: 수동 검토

이 권장 사항은 자동으로 점검할 수 없습니다. --include-manual 옵션을 전달하면 스캔 결과에 이 지침과 함께 표시됩니다.

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".

조치 방법

조치 방식: 가이드 또는 인프라 패치

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; }

속성

운영 체제: 모두
태그: nginxconfiguration
참고 자료: CIS NGINX Benchmark v3.0.0 - 2.5.2 Ensure default error and index.html pages do not reference NGINX