7IO Security Search Primary Menu Skip to contentLinuxCommandsToolsWindowsCommandsTipToolsVulnerabilityPythonTools 2.7Cookies   Search for:          Linux, ToolsAre you sure? Are you one hundred percent sure? February 14, 2016 Eelko Neven downloadrm -rf pic*Are you sure? Are you one hundred percent sure?maybe… … allows you to run a command and see what it does to your files without actually doing it! After reviewing the operations listed, you can then decide whether you really want these things to happen or not.What is this sorcery?!? Continue reading Are you sure? Are you one hundred percent sure? → BashGNUlinuxMaybeProcessespython     Python, Tools 2.7ICMPTunnel – Firewall evasion November 14, 2015 Eelko Neven downloadTransparently tunnel your IP traffic through ICMP echo and reply packets.‘icmptunnel’ works by encapsulating your IP traffic in ICMP echo packets and sending them to your own proxy server. The proxy server decapsulates the packet and forwards the IP traffic. The incoming IP packets which are destined for the client are again encapsulated in ICMP reply packets and sent back to the client. The IP traffic is sent in the ‘data’ field of ICMP packets.RFC 792, which is IETF’s rules governing ICMP packets, allows for an arbitrary data length for any type 0 (echo reply) or 8 (echo message) ICMP packets.So basically the client machine uses only the ICMP protocol to communicate with the proxy server. Applications running on the client machine are oblivious to this fact and work seamlessly.Use CasesBypassing Captive Portals: Many public Wi-Fi use Captive Portals to authenticate users, i.e. after connecting to the Wi-Fi the user is redirected to a webpage that requires a login. icmptunnel can be used to bypass such authentications in transport/application layers.Bypassing firewalls: Firewalls are set up in various networks to block certain type of traffic. icmptunnel can be used to bypass such firewall rules. Obfuscating the data payload can also be helpful to bypass some firewalls.Encrypted Communication Channel: Adding sufficient encryption to the data, icmptunnel can be used to establish an encrypted communication channel between two host machines.RequirementsA POSIX-compliant host with root access that will be communicating with only ICMP protocol. This will be the client.A POSIX-compliant host with root access with full access to the internet. This will act as our proxy server.The proxy server should be accessible from the client host.Note: Although icmptunnel has been successfully tested on Ubuntu 14.04 LTS, it should work on others as well.Step-by-step instructionsInstall make on both machines.Clone this repository using this command:git clone https://github.com/DhavalKapil/icmptunnel
Run make:make
On the server side run the tunnel with root privileges:[sudo] ./icmptunnel -s 10.0.1.1
On the client side, find out your gateway and the corresponding interface:route -n
Destination     Gat