Kanclirz Jr. J. (ed.)'s Netcat Power Tools PDF

By Kanclirz Jr. J. (ed.)

Initially published in 1996, Netcat is a netowrking software designed to learn and write facts throughout either Transmission keep an eye on Protocol TCP and person Datagram Protocol (UDP) connections utilizing the TCP/Internet Protocol (IP) protocol suite. Netcat is frequently often called a "Swiss military knife" application, and for solid cause. like the multi-function usefullness of the venerable Swiss military pocket knife, Netcat's performance is beneficial as either a standalone software and a backe-end device in a variety of functions. a number of the many makes use of of Netcat contain port scanning, moving documents, grabbing banners, port listening and redirection, and extra nefariously, a backdoor. this is often the one publication devoted to complete insurance of the tool's many gains, and through the top of this ebook, you will discover how Netcat should be some of the most important instruments on your arsenal.

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Extra resources for Netcat Power Tools

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This redirection of traffic is called a relay. From the source computer: nc 12345 On the relay computer: nc –l –p 12345 | nc 54321 In this basic scenario, input from the source computer (in client mode) is sent to the relay computer (in server mode). The output is piped into a second instance of Netcat (in client mode), which ultimately connects to the target computer. Second, Netcat originates on port 12345, yet the attacker would see the attack coming from port 54321.

The Exception mode setting is set to Enable, which tells us that the windows firewall is configured to allow exceptions to the windows firewall. This option is important because it allows us to add an exception for our Netcat listening port. If the netsh command reports the Exception mode as Disabled, the firewall is not allowing any exceptions. In this case, we can configure the firewall to allow exceptions with the following command. Netsh firewall set opmode mode = enable exceptions = enable profile = all After we verify that the settings on the firewall are configured to allow exceptions, we can make an exception for our Netcat listener.

4 12345 < textfile As with all connections using Netcat, file transfers are unencrypted. If you are concerned about the privacy of the data you are transferring over Netcat, consider using Cryptcat, a version of Netcat that incorporates encrypted tunnels. Cryptcat uses the same command-line syntax as Netcat, but uses twofish encryption. Also consider using Netcat inside an Secure Shell (SSH) tunnel as a means of encrypting Netcat’s traffic. This section was meant to be a very basic introduction to transferring files with Netcat.

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