SSRF Advanced Methodology✨

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By Abhijeet Kumawat, Jr. Security Consultant, Bug Bounty Hunter

What is SSRF? 🛡️🔥

Server-Side Request Forgery (SSRF) allows attackers to manipulate a server into sending malicious requests, often bypassing firewalls to access sensitive data, cloud metadata, internal APIs, or internal networks. 🛠️💻

Created by Copilot

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Why is SSRF Critical? ❓💥

• 🧱 Access internal services and hidden endpoints.
• ☁️ Obtain cloud instance metadata (AWS, GCP).
• 🕵️‍♂️ Perform internal network scans.
• 🧨 Exploit further by chaining SSRF with RCE.

Detailed SSRF Methodology 📚🔍

1. Subdomain Enumeration 🔍🗺️

• Tools: 🛠️ Subfinder, Amass, Assetfinder, CRT.sh, Chaos.
• Where to Find Bugs: 🐛 Look for internal subdomains like dev.target.com, staging.target.com, or api.target.com. Test staging environments as they often have misconfigured SSRF protections.
• Commands: 🖥️

subfinder -d target.com -o subdomains.txt amass enum -active -d target.com -o amass_subdomains.txt chaos -d target.com -o chaos_subdomains.txt

2. Live Domain Detection 🛠️🌐

• Tools: HTTPX, Httprobe, Naabu.
• Where to Find Bugs: 🔍 Services running on uncommon ports (e.g., 8080, 8443, 8888).
• Commands: 💻

cat subdomains.txt | httpx -threads 150 -silent -status-code -o live_domains.txt naabu -list live_domains.txt -p 80,443,8080,8443,8888 -o open_ports.txt

3. URL Enumeration and Filtering 🔗🧵

• Tools: gauplus, Katana, Waybackurls, hakrawler.
• Where to Find Bugs: 📍 URLs with parameters like ?url=, ?next=, ?redirect=, ?link=.