Bypassing Corporate Firewalls with Chisel for RDP Access
Scenario Overview: A corporate network restricts inbound connections but allows outbound traffic (e.g., HTTP, HTTPS). We need to access an internal RDP (3389) server behind the firewall from an external attacker-controlled machine. Constraints: Firewall blocks inbound RDP, SSH, and VPN. Only outbound HTTP/HTTPS is allowed. Direct reverse shells are detected. Sneaking in without getting caught, when it’s not allowed: Chisel (TCP/HTTP Tunneling) Chisel creates an encrypted tunnel over allowed protocols (HTTP/WebSockets), bypassing firewall restrictions. Step-by-Step Exploitation 1. Setup the Chisel Server (Attacker Machine) On the attacker machine (public IP: 10.10.10.10), start the Chisel server in reverse mode (to allow victim-initiated connections): Listens on port 8080 (HTTP-friendly to evade detection). --reverse ensures ports are opened on the server (attacker) rather than the client (victim). 2. Victim Machine (Internal Network) Connects Back On the...