Gaurav Kumar(GDATTACKER) @gdattacker
Recon 🔍 | Assets 🌐 | Cybersecurity 🛡️ | World + Web explorer 🌍 | Tasty food keeps me scanning | @HackenProof Security Researcher facebook.com/drago4344 New Delhi, India Joined May 2014-
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7) Even scarier: if multiple servers share the same Cloudflare-only SG, you can point records to them too. - Misconfigured apps/proxy (nginx, apache, kong, k8s) - Services trusting x-forwarded-host Lots of attack surface.
6) Now, when we access the domain we control (in this case bypass-grafana.fearsoff.org) we bypass the Cloudflare Firewall policy. In fact we are reaching the AWS server through Cloudflare's IPs.
5) Here's where it gets interesting. To access that Grafana application without the internal VPN (1.1.1.1), all we need to do is: Create a DNS A record in a Cloudflare zone we control and point it to 13.214.193.141.
4) We discover that grafana.fearsoff.net points to IP address 13.214.193.141 on AWS. But this IP is not directly accessible because the AWS security group only allows Cloudflare IP ranges.
3) This means that if anyone tries to access grafana.fearsoff.net without using the internal VPN with IP 1.1.1.1, they will get an Access denied message.
2) Let's say our target is grafana.fearsoff.net, which has this firewall rule: (http.host eq "grafana.fearsoff.net" and ip.src ne 1.1.1.1)
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Sometimes the vuln isn’t in HTML at all. It’s in JavaScript itself: document.write(location.hash) If you see raw sinks like innerHTML, document.write, or eval, you’ve already won.
Think you blocked <script>? Cool. I’ll just use SVG. <svg onload=alert(1)> Browsers love SVG, and filters often forget it exists. This is why context + parser knowledge >>> memorized payloads.
HTML context ≠ attribute context ≠ JS context. ✅ Inside HTML → <img src=x onerror=alert(1)> ✅ Inside attribute → " onmouseover=alert(1) x=" ✅ Inside JS → ');alert(1);// If you don’t test the right payload in the right context, you’re just throwing darts blindfolded.
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25 Parameters Devs Actually Use (and Hunters Forget) debug=true test=1 admin=1 isAdmin=true isPremium=true role=user → flip to admin uid=42 ref=partner → flip to internal redirect=/dashboard next=/secret returnUrl=evil.com (open redirect)…
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Great post on decrypting credentials for priv esc from SmartDeploy by Garrett Foster (don’t know his handle). specterops.io/blog/2025/08/1…
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