I recently read about netcat and it is often mentioned that it could be used as a "backdoor". What exactly is meant by backdoor? Could some one give an example of such usage of netcat.
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With netcat it's possible for a simple user to spawn a remote shell. For example, the following command will allow a remote user to access a bash shell on port 5000
All an attacker has to do once this is running is:
You can even try this example on your own computer.
However, this will only work over the internet if no firewall blocking access to port 5000 is present.
Anything that can listen for incoming network connections (like Perl, python, zsh, socat, inetd) could be considered a backdoor.
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