Netcat Brute Force Script

Question

When I enter netcat [ip address] [port] I am asked to enter a password, I actually know the password, it is a date.

However, I would like to create a script that enters the the netcat ip and port number and then goes through a list of dates. I have created a large list of dates that contain the correct password, but I am unsure how to create a script that does what I want. The password (a date) is in ddmmyyyy format. I would really appreciate some help!

Just to make it clear what I am trying to do...

1) Script automatically enters: netcat [ip address] [port]
2) Script automatically enters: 01012000
3) Script automatically enters: netcat [ip address] [port]
4) Script automatically enters: 02012000
..................
500) Script automatically enters: netcat [ip address] [port]
501) Script automatically enters: 10082001 (CORRECT PASSWORD) Script end

*The script does not need to end when the password is correct, it would be nice, but not necessary. I am trying to just implement the concept first.

ilkkachu · Accepted Answer · 2021-02-02 02:58:00Z

You could use brace expansion to create consecutive dates and pipe the input to netcat:

#!/bin/bash
for date in 2021-01-{01..31}; do
    echo $date | netcat somehost ...
done

Or, a bit more complicated: for date in 2021-{01-{01..31},02-{01..02}}; do ....

Or, read from a file while read -r date; do ...; done < dates.txt.

You may need to check how to make netcat quit on time, especially if the remote doesn't close the connection with the commands you gave. There's a few versions of netcat, mine has e.g. this option:

-q seconds
after EOF on stdin, wait the specified number of seconds and then quit.

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