SSRF Testing: Control Server‑Side Outbound Requests
SSRF forces your server to make requests on an attacker’s behalf. It can enable internal network access and cloud metadata exfiltration. Proper validation and egress controls are essential.
What is SSRF?
If your app fetches user-provided URLs (webhooks, imports, image URLs) without strong validation, SSRF risk increases.
Attackers can target internal services or cloud metadata endpoints to obtain sensitive credentials.
How do you detect SSRF?
Inspect URL fetch flows in code and validate runtime behavior with controlled tests. Assess redirects and DNS-bypass scenarios.
- Discover endpoints that accept and fetch URLs
- Flag missing allowlists and private IP protections
- Evaluate redirect and DNS rebinding bypass paths
- Report metadata and internal network access risk
How do you prevent SSRF?
Use strict URL validation, allowlists, and network-level egress controls.
- Allowlist domains and block private IP ranges
- Restrict redirects and re-validate after redirects
- Apply timeouts and hardened DNS resolution
- Use egress firewall rules to limit outbound traffic
Reduce SSRF risk with GuardionX
GuardionX flags SSRF-prone code paths and suggests safer validation and allowlist patterns. DAST helps validate behavior signals.
Findings are grouped and prioritized so teams can fix the highest impact issues first.
FAQ
Is SSRF only dangerous in the cloud?
No. On-prem systems can still face internal network access and sensitive service exposure. Cloud metadata just increases impact.
Is regex-only URL validation enough?
Usually not. Combine parsing, DNS resolution checks, redirect handling, and private IP blocking.
Do I need an egress firewall?
It is one of the most effective SSRF mitigations. Use it alongside code-level validation.
Make SSRF risk visible
Scan URL-fetch endpoints, prioritize risk, and apply safer validation patterns with GuardionX.