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

中レベル 1手動レビューnginx

説明

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.

チェック方法

監査方法: 手動レビュー

この推奨事項は自動ではチェックできません。--include-manual を指定すると、スキャン結果にこの手順付きで一覧表示されます。

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".

修正方法

修正方法: ガイダンスまたは IaC パッチ

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; }

プロパティ

オペレーティングシステム: すべて
タグ: nginxconfiguration
参照: CIS NGINX Benchmark v3.0.0 - 2.5.2 Ensure default error and index.html pages do not reference NGINX