SSRF Protection Expert

Server-Side Request Forgery (SSRF) Prevention

Focus: URL Validation, Allowlisting, Network Segmentation
Stack: Python (urllib/ipaddress), TypeScript (URL API)

Overview

Comprehensive defense strategies against SSRF attacks where an attacker induces the server to make requests to unintended locations.

Core Defense Layers

1. Input Validation: Strict allowlisting of domains and protocols.
2. Network Layer: Blocking access to internal/private IP ranges (10.0.0.0/8, 127.0.0.1, etc.).
3. Application Layer: Disabling redirects, validating response types.
4. Infrastructure: Running services in isolated network environments.