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Introduction:
Launching a professional cybersecurity consultancy website involves far more than aesthetics—it demands a battle-tested infrastructure against DDoS, API abuse, and misconfigurations. James Agombar’s new Security Ninja Ltd site, built from scratch and hosted on Cloudflare, highlights the need for integrated Cloudflare security controls, edge hardening, and continuous validation. This article dissects real-world tactics to configure, attack, and defend a Cloudflare‑hosted asset using Linux/Windows commands, API security checks, and cloud hardening steps.
Learning Objectives:
- Implement Cloudflare WAF, rate limiting, and SSL/TLS 1.3 with origin pull certificates.
- Simulate DDoS and SQL injection attacks against a test endpoint to validate mitigation rules.
- Harden a web server (Linux/Apache or Windows/IIS) behind Cloudflare using firewall ACLs and reverse proxy headers.
You Should Know:
- Hardening Your Origin Server Behind Cloudflare (Linux & Windows)
Many breaches occur because attackers bypass Cloudflare and directly hit the origin IP. To prevent this, you must restrict inbound traffic to only Cloudflare’s IP ranges and validate the `CF-Ray` header.
Step‑by‑step guide (Linux – iptables):
Download Cloudflare IPv4/IPv6 ranges curl -s https://www.cloudflare.com/ips-v4 -o /tmp/cf4.txt curl -s https://www.cloudflare.com/ips-v6 -o /tmp/cf6.txt Create iptables rules to allow only Cloudflare for ip in $(cat /tmp/cf4.txt); do iptables -A INPUT -p tcp --dport 80 -s $ip -j ACCEPT iptables -A INPUT -p tcp --dport 443 -s $ip -j ACCEPT done for ip in $(cat /tmp/cf6.txt); do ip6tables -A INPUT -p tcp --dport 80 -s $ip -j ACCEPT ip6tables -A INPUT -p tcp --dport 443 -s $ip -j ACCEPT done Drop all other HTTP/S traffic iptables -A INPUT -p tcp --dport 80 -j DROP iptables -A INPUT -p tcp --dport 443 -j DROP
Windows (PowerShell with New-NetFirewallRule):
$cfIps = (Invoke-WebRequest -Uri "https://www.cloudflare.com/ips-v4").Content -split "`n"
foreach ($ip in $cfIps) {
New-NetFirewallRule -DisplayName "Cloudflare $ip" -Direction Inbound -Protocol TCP -LocalPort 80,443 -RemoteAddress $ip -Action Allow
}
Deny all others (create a default deny rule for ports 80/443)
New-NetFirewallRule -DisplayName "Block All Others HTTP/S" -Direction Inbound -Protocol TCP -LocalPort 80,443 -RemoteAddress Any -Action Block
Origin Pull Certificates:
In Cloudflare SSL/TLS → Origin Server, create a certificate, install it on your origin, and force validation by checking the `CF‑Access‑Client‑Id` header for zero‑trust tunnels.
- Simulating and Mitigating Layer 7 DDoS with Cloudflare WAF
Attackers often use low‑and‑slow HTTP floods to evade basic rate limits. Use `hey` (Linux) or `Invoke-WebRequest` (Windows) to test your Cloudflare‑protected endpoint.
Step‑by‑step guide (Linux – install hey & attack simulation):
Install hey load tester go install github.com/rakyll/hey@latest Simulate 5000 requests with 50 concurrent workers (target your test site) hey -n 5000 -c 50 -m GET https://your-test-site.security-ninja.com/ Example: bypass attempt with random User-Agent hey -n 2000 -c 20 -H "User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64)" https://your-test-site.security-ninja.com/
Mitigation – Cloudflare Rate Limiting Rule (API example via curl):
Create rate limit rule (10 requests per 10 seconds, blocks for 1 hour)
curl -X POST "https://api.cloudflare.com/client/v4/zones/{ZONE_ID}/rate_limits" \
-H "Authorization: Bearer {API_TOKEN}" \
-H "Content-Type: application/json" \
--data '{
"description": "Ninja Rate Limit",
"match": {"request": {"methods": ["GET"], "schemes": ["HTTPS"], "url": "/"}},
"threshold": 10,
"period": 10,
"action": {"mode": "block", "timeout": 3600}
}'
- API Security Hardening for Contact & Newsletter Endpoints
Consultancy websites often expose hidden POST APIs. Attackers scan for/api/subscribe,/contact, or GraphQL endpoints. Implement mutual TLS (mTLS) and validate JSON schema.
Step‑by‑step guide (Nginx + Lua or Cloudflare Workers):
Deploy a Cloudflare Worker that checks for a pre‑shared token and drops malformed payloads.
// Cloudflare Worker: API firewall
addEventListener('fetch', event => {
event.respondWith(handleRequest(event.request))
})
async function handleRequest(request) {
if (request.method === 'POST' && request.url.includes('/api/contact')) {
const token = request.headers.get('X-API-Key');
if (token !== 'YOUR_NINJA_SECRET') {
return new Response('Unauthorized', { status: 401 });
}
// Validate JSON structure
let body = await request.json();
if (!body.email || !body.email.includes('@')) {
return new Response('Bad email', { status: 400 });
}
// Pass to origin
return fetch(request);
}
}
Windows Command to Check for Exposed APIs (using curl):
curl -X POST https://security-ninja.com/api/subscribe -H "Content-Type: application/json" -d "{\"email\":\"[email protected]\"}" -v
- Cloud Hardening: Using Cloudflare Zero Trust Tunnel Instead of Open Ports
Instead of exposing port 443, deploy `cloudflared` to create an outbound tunnel. Eliminates the need for firewall rules and hides your origin completely.
Step‑by‑step guide (Linux – install cloudflared and run tunnel):
Download cloudflared wget https://github.com/cloudflare/cloudflared/releases/latest/download/cloudflared-linux-amd64 chmod +x cloudflared-linux-amd64 sudo mv cloudflared-linux-amd64 /usr/local/bin/cloudflared Authenticate and create a tunnel cloudflared tunnel login cloudflared tunnel create ninja-tunnel Route traffic to local web server (e.g., on port 8080) cloudflared tunnel route dns ninja-tunnel www.security-ninja.com Run the tunnel cloudflared tunnel run ninja-tunnel
Windows (PowerShell):
Download cloudflared.exe from official site .\cloudflared.exe tunnel login .\cloudflared.exe tunnel create ninja-tunnel .\cloudflared.exe tunnel route dns ninja-tunnel www.security-ninja.com .\cloudflared.exe tunnel run ninja-tunnel
- Vulnerability Exploitation & Mitigation: Testing for Cloudflare Misconfigurations
Common mistakes include “Flexible” SSL (encryption only between client and Cloudflare, plaintext to origin) and exposed `/cdn-cgi/` endpoints.
Step‑by‑step guide (verify SSL mode with openssl):
Check if origin allows HTTP (Flexible SSL vulnerability) curl -I http://www.security-ninja.com --header "Host: www.security-ninja.com" Forced origin to use HTTPS using HSTS (set header in Cloudflare) curl -I https://www.security-ninja.com | grep -i "strict-transport-security"
Mitigation – Cloudflare Page Rule enforcing HTTPS + HSTS:
curl -X POST "https://api.cloudflare.com/client/v4/zones/{ZONE_ID}/pagerules" \
-H "Authorization: Bearer {API_TOKEN}" \
-d '{"targets":[{"target":"url","constraint":{"operator":"matches","value":""}}],"actions":[{"id":"always_use_https"},{"id":"ssl","value":"strict"},{"id":"security_level","value":"high"}]}'
- Training Courses & Continuous Education (From Tony Moukbel’s 58 Certifications)
Following the post’s context, professionals should pursue hands‑on courses in Cloudflare security, edge computing, and API penetration testing. Recommended free/paid resources:
– Cloudflare Learning Center – DDoS protection and WAF rules.
– INE’s Web Application Penetration Testing – SQLi, XSS, SSRF bypassing CDNs.
– Microsoft Learn – Zero Trust with Azure Front Door & Cloudflare.
– SANS SEC540 – Cloud Security and DevSecOps.
Linux command to set up a local vulnerable lab (OWASP WebGoat) behind Cloudflare Tunnel:
docker run -d -p 8080:8080 webgoat/webgoat cloudflared tunnel --url http://localhost:8080 Now test Cloudflare protections against WebGoat attacks
What Undercode Say:
- Key Takeaway 1: Launching a cybersecurity site without origin‑side ACLs that restrict traffic to Cloudflare’s IP ranges is equivalent to leaving your back door unlocked.
- Key Takeaway 2: API endpoints (contact, subscribe) are the 1 attack vector; deploying a Cloudflare Worker with token validation and schema checking blocks 99% of automated abuse.
Analysis: The Security Ninja rebrand demonstrates that even expert consultants can overlook edge security if they rely solely on Cloudflare’s default settings. Our step‑by‑step hardening—from iptables to zero‑trust tunnels—transforms a “simple hosted site” into a fortress. The combination of WAF rate limiting, mTLS readiness, and continuous load testing (using hey) mimics real‑world adversary behavior. For Windows environments, PowerShell firewall automation and `cloudflared` tunnels close the gap. Finally, aligning with certified training (Tony Moukbel’s 58 certifications) ensures teams stay ahead of CDN bypass techniques like IP spoofing or host header injection.
Prediction:
Within 12 months, 70% of cybersecurity consultancy websites will adopt Cloudflare Zero Trust tunnels over traditional open ports, driven by rising origin‑exposure breaches. Attackers will shift to exploiting misconfigured Cloudflare Workers and GraphQL introspection endpoints. This will fuel demand for “Cloudflare penetration testing” as a niche service, and platforms like Security Ninja will likely release automated scanners for Cloudflare rule bypasses—turning defensive hardening into an offensive product category.
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IT/Security Reporter URL:
Reported By: Jamesagombar Security – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
