Vulnerability Fixation
Server-Side Request Forgery (SSRF)

Solution to Fix SSRF

To prevent or fix SSRF (Server-Side Request Forgery) vulnerabilities, you need to implement strong input validation, network restrictions, and safe request handling. Below is a structured SSRF mitigation checklist and sample solutions based on common environments.

1. Input Validation and Whitelisting

Only allow requests to explicitly defined, trusted domains/IPs.

2. Avoid Direct Use of User Input in HTTP Requests

Block:

• 127.0.0.1, localhost
• Private IPs: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16
• AWS/GCP metadata services: 169.254.169.254

3. Use a Network Firewall / egress filtering

• Deny the web app from accessing the internal network unless explicitly needed.
• Example: AWS Security Groups, Docker –network=none.

4. Enforce DNS Rebinding Protections

• Perform DNS resolution and validate IP against blocklists.
• Re-validate after redirection (e.g., avoid redirecting to internal IPs).