Unusual firewall bypassing techniques, network and computer security.

After a while, finding that nothing more happened, she decided on going into the garden at once; but, alas for poor Alice! when she got to the door, she found she had forgotten the little golden key, and when she went back to the table for it, she found she could not possibly reach it: she could see it quite plainly through the glass, and she tried her best to climb up one of the legs of the table, but it was too slippery; and when she had tired herself out with trying, the poor little thing sat down and cried.

Lewis Carroll "Alice In Wonderland"
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With this Proof Of Concept tool, you can simply create an ICMP tunnel between two computers, which may be located in different networks and separated by a firewall. Skeeve utilizes ICMP packets and IP address spoofing technology to create a data channel in order to redirect TCP connections inside this channel.

Skeeve creates an ICMP tunnel which is based on the use of a Bounce server.

This method relies upon the basic IP address spoofing technology. The Client of the tunnel is trying to send a packet to the Bounce server with an address of the destination Server as a source IP. The Bounce Server can replay this packet and forward it to the destination Server. By adding some payload to the packet, we can establish a covert communication channel between two computers without direct network interaction.

Skeeve Client accepts TCP connections and works as a converter of the IP header (by changing protocol flag from TCP to ICMP echo_request|reply and making some other slight modifications). Skeeve Server is doing the reverse procedure and restores original IP header settings. Both parts are implemented in one C program as a Loadable Kernel module.

Current Skeeve version: 1.0; README
Download | md5sum: 6fba1f136f30d695114a0b81216f9e90

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