The instructor loaded up a tool called HTTPtunnel . "If a firewall allows HTTP outbound, tunnel everything inside HTTP. But not normal HTTP— weird HTTP. Headers out of order. Chunked encoding with false lengths. Firewall's protocol decoder will give up and pass the raw stream to the web server. And the web server? It's yours."
Next, she needed a foothold. A public web server sat on the DMZ. Instead of brute-forcing or vulnerability scanning (both IDS triggers), she browsed it like a normal user, then used HTTP parameter pollution —adding duplicate id parameters to a login form. The web server’s backend merged them in a way that bypassed authentication. The IDS saw only id=123 and id=456 . Normal traffic.
He demonstrated three evasions, each more elegant than the last. The instructor loaded up a tool called HTTPtunnel
She reset, opened Fragroute, and crafted a rule file:
Now for the firewall evasion. From the DMZ box, she launched her DNS tunneling script. The firewall’s App-ID saw standard DNS requests to an external server she controlled. It allowed them. Inside those DNS queries, her reverse shell rode out, then back in to pivot to the internal network. Headers out of order
Maya poured a second cup of coffee, pulled her hood over her head out of habit, and clicked "Start."
The next morning, Viktor stopped by her desk. "I saw your final exam run," he said, almost smiling. "The SOC didn't even blink. You walked right past the firewall, used a honeypot's own fake credentials to blindside it, and made Snort drop half your packets." And the web server
"An IDS doesn't care about your payload," he explained, pulling up a live terminal. "It cares about your pattern. It sees ten SYN packets in a row from your IP? Alert. It sees a Nmap script with default arguments? Alert. You might as well honk a horn."