Fix Improper Assets Management in Astro
Astro's 'public/' directory is a common vector for information disclosure. Anything placed there is served statically without processing, bypassing the Vite pipeline. Improper asset management occurs when developers leak sensitive metadata, source maps, or environment backups by misplacing them in the public root or using incorrect environment variable prefixes that expose secrets to the client-side bundle.
The Vulnerable Pattern
---
// src/pages/leaked.astro
// VULNERABILITY: Sensitive data in public/ and exposing secrets to client
---
The Secure Implementation
To secure Astro assets, follow the principle of least exposure. 1. Move all functional assets (images, fonts, scripts) from 'public/' to 'src/assets/' so they are hashed and obfuscated during build. 2. Strictly audit '.env' files; only prefix variables with 'PUBLIC_' if they are intended for the browser. 3. Use a '.vercelignore' or '.ignore' file to ensure sensitive files like '.env.backup' or 'auth.json' never reach the deployment edge. 4. Implement middleware to restrict access to the 'dist/' output if internal documentation must be hosted.
---
// src/pages/secure.astro
// FIX: Use src/assets for managed assets and server-side env vars
import { Image } from 'astro:assets';
import myImage from '../assets/secure-logo.webp';
// Accessing non-PUBLIC_ variables (Server-only)
const secretKey = import.meta.env.STRIPE_SECRET;
Your Astro API
might be exposed to Improper Assets Management
74% of Astro apps fail this check. Hackers use automated scanners to find this specific flaw. Check your codebase before they do.
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