Category: YouTube CCESTE

Type: Do

Access: Email

Description: There’s a file /home/admin/scores.txt with two columns (imagine the first number is a counter and the second one is a test score for example).

Find the average (more precisely; the arithmetic mean: sum of numbers divided by how many numbers are there) of the numbers in the second column (find the average score).

Use exaclty two digits to the right of the decimal point. i. e., use exaclty two “decimal digits” without any rounding. Eg: if average = 21.349 , the solution is 21.34. If average = 33.1 , the solution is 33.10.

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Level: Easy

Type: Hack

Description: There is a web server on port :80 protected with Port Knocking. Find the one “knock” needed (sending a SYN to a single port, not a sequence) so you can curl localhost.

Test: Executing curl localhost returns a message with md5sum fe474f8e1c29e9f412ed3b726369ab65. (Note: the resulting md5sum includes the new line terminator: echo $(curl localhost))

La versión del Pelado Nerd la encontrás acá https://www.youtube.com/watch?v=45E_RChOfz0

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Level: Easy

Description: This is the Command Line Murders with a small twist as in the solution is different

Enter the name of the murderer in the file /home/admin/mysolution

Anteriormente intenté resolverlo sin éxito, te lo dejo acá para que lo veas
https://youtu.be/IM8A8nifWjg

Este es el segundo intento, ya con alguna idea de como encarar el desafío

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Level: Easy

Description: This is the Command Line Murders with a small twist as in the solution is different

Enter the name of the murderer in the file /home/admin/mysolution

Honestamente no sabía ni por donde arrancar, pero creo que nos quedaron algunos buenos indicios para un segundo intento

Recuerden que nadie nació sabiendo, lo importante es aprender en el camino 😊

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Level: Easy

Type: Do

Description: Alice the spy has hidden a secret number combination, find it using these instructions:

1) Find the number of lines with occurrences of the string Alice (case sensitive) in the *.txt files in the /home/admin directory
2) There’s a file where Alice appears exactly once. In that file, in the line after that “Alice” occurrence there’s a number.
Write both numbers consecutively as one (no new line or spaces) to the solution file.
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Level: Easy

Type: Do

Description: There’s a web server access log file at /home/admin/access.log. The file consists of one line per HTTP request, with the requester’s IP address at the beginning of each line.

Find what’s the IP address that has the most requests in this file (there’s no tie; the IP is unique). Write the solution into a file /home/admin/highestip.txt.

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Scenario: “Saint John”: what is writing to this log file?
Level: Easy
Type: Fix
Description: A developer created a testing program that is continuously writing to a log file /var/log/bad.log and filling up disk. You can check for example with tail -f /var/log/bad.log.
This program is no longer needed. Find it and terminate it.

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