Owasp Juice Shop Ssrf __hot__ Info

Abstract Server-Side Request Forgery (SSRF) remains a critical web security vulnerability, often enabling internal network reconnaissance, port scanning, and cloud metadata theft. OWASP Juice Shop, a modern intentionally vulnerable web app, contains multiple SSRF challenges that simulate real-world misconfigurations. This paper dissects the Juice Shop SSRF attack surface, demonstrates exploitation techniques, and discusses detection and prevention strategies. 1. Introduction OWASP Juice Shop is a Node.js/Express-based application packed with vulnerabilities from the OWASP Top 10. Among its medium-difficulty challenges is SSRF (Server-Side Request Forgery) — specifically the challenge titled “SSRF” (ID: ssrf ) and related endpoints that allow an attacker to make the server perform arbitrary HTTP requests.

GET /api/Image?url=http://localhost:3000/encryptionkey.txt If the challenge is active, the server will fetch that internal resource and return its content inside the image response (or as plain text if content type mismatches). owasp juice shop ssrf

In Juice Shop, the impact is deliberately limited to reading a single file, but in real apps, SSRF often leads to complete internal network compromise. 6.1 Allowlist-Based Input Validation const ALLOWED_HOSTS = ['images.trusted.com', 'cdn.example.com']; const urlObj = new URL(userUrl); if (!ALLOWED_HOSTS.includes(urlObj.hostname)) return res.status(403).send('Host not allowed'); GET /api/Image

SSRF occurs when an application fetches a remote resource based on user-supplied input without proper validation. In Juice Shop, the vulnerability is deliberately placed to educate developers on risks like internal network scanning, localhost access, and cloud metadata endpoint extraction. 2.1 Vulnerable Endpoint The primary SSRF vector in Juice Shop (version 14+) is the /api/Image endpoint. This endpoint accepts a URL parameter and attempts to fetch an image from that location. In Juice Shop

http://[::1]:3000/encryptionkey.txt

http://localtest.me/encryptionkey.txt (if localtest.me resolves to 127.0.0.1) Use SSRF to probe internal IP ranges (e.g., 192.168.1.1 , 10.0.0.1 , 172.16.0.1 ). Example:

GET /api/Image?url=https://example.com/image.png HTTP/1.1 The server code (simplified) looks like: