Juice Shop Ssrf -

"url": "file:///etc/passwd" Juice Shop's Node.js request module does follow file:// by default, but older urllib or curl wrappers do. Defenses: How to Kill SSRF Juice Shop is vulnerable by design. Here is how to fix it in production: 1. Allowlist, Never Blocklist const ALLOWED_DOMAINS = ['maps.googleapis.com', 'trusted-cdn.com']; const urlObj = new URL(userUrl); if (!ALLOWED_DOMAINS.includes(urlObj.hostname)) return res.status(403).send('Domain not allowed');

Inspecting the network traffic reveals that the server makes a backend request to: https://maps.googleapis.com/maps/api/staticmap?center=... juice shop ssrf

POST /api/image/uploads HTTP/1.1 Host: juice-shop.local Content-Type: application/json "url": "http://localhost:3000/some/path" "url": "file:///etc/passwd" Juice Shop's Node

The critical mistake: . Exploitation: The Juice Shop SSRF Challenge To solve the Juice Shop SSRF challenge (usually titled "Who's the real unicorn?" or "SSRF – Request Bomb"), you must make the server fetch a resource from a location it shouldn't. Step 1: Reconnaissance with Localhost First, test if the server will fetch from localhost . Use Burp Suite or your browser's developer tools to intercept the image upload request. Allowlist, Never Blocklist const ALLOWED_DOMAINS = ['maps

Introduction: The Silent Proxy Server-Side Request Forgery (SSRF) is often called the "forgotten twin" of Cross-Site Request Forgery (CSRF). While CSRF tricks a user's browser , SSRF tricks the server itself . An SSRF vulnerability allows an attacker to induce the server to make HTTP requests to an arbitrary domain of the attacker's choosing.

Or more classically: The functionality, where you provide a URL to an image of your broken juice. The server tries to fetch that image to validate it. The Vulnerability: Unvalidated URL Fetching Let's look at the pseudo-code of the vulnerable endpoint:

For defenders, the lesson is clear: . Validate the destination as if your internal network depends on it—because it does. This article is for educational purposes. Always test on systems you own or have explicit permission to test.