Shop Ssrf: Owasp Juice

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

The challenge is solved when the student successfully extracts encryptionkey.txt . The OWASP Juice Shop SSRF challenge provides a realistic, hands-on example of how an innocent-looking image fetch endpoint can become a gateway to internal resources. By exploiting it, attackers can read local files, scan internal networks, and steal cloud credentials. Mitigation requires strict allowlisting, network controls, and never trusting user-supplied URLs. 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'); http://[::1]:3000/encryptionkey

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: Example: curl "http://localhost:3000/api/Image

curl "http://localhost:3000/api/Image?url=http://localhost:3000/encryptionkey.txt" HTTP 200 with the encryption key in the body (may be text/plain despite image content-type header). 5. Impact Assessment | Attack Vector | Impact | |---------------|--------| | Localhost file read | Exposure of source code, config files, secrets | | Internal port scan | Discovery of admin panels, databases, Redis, Jenkins | | Cloud metadata theft | IAM credentials, access tokens → cloud account compromise | | Service interaction (e.g., Redis, Memcached) | Potential RCE via protocol smuggling |

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.