Level: Medium
Type: Fix
Access: Public
Description: There’s an Nginx web server installed and managed by systemd. Running curl -I 127.0.0.1:80 returns curl: (7) Failed to connect to localhost port 80: Connection refused , fix it so when you curl you get the default Nginx page.
– YouTube https://www.youtube.com/@cceste
– Instagram https://www.instagram.com/ccesteok
– Facebook https://www.facebook.com/ccesteok
– Discord https://discord.gg/ZWQVg7cgdR
Level: Medium
Type: Fix
Access: Public
Description: There’s a web server serving a file /var/www/html/index.html with content “hello sadserver” but when we try to check it locally with an HTTP client like curl 127.0.0.1:80, nothing is returned. This scenario is not about the particular web server configuration and you only need to have general knowledge about how web servers work.
Al fin de cuentas no estaba tan lejos de la solución!
De paso aprendemos bien la sintaxis de iptables
– YouTube https://www.youtube.com/@cceste
– Instagram https://www.instagram.com/ccesteok
– Facebook https://www.facebook.com/ccesteok
– Discord https://discord.gg/ZWQVg7cgdR
Level: Medium
Type: Fix
Access: Public
Description: Your objective is to be able to insert a row in an existing Postgres database. The issue is not specific to Postgres and you don’t need to know details about it (although it may help).
Helpful Postgres information: it’s a service that listens to a port (:5432) and writes to disk in a data directory, the location of which is defined in the data_directory parameter of the configuration file /etc/postgresql/14/main/postgresql.conf. In our case Postgres is managed by systemd as a unit with name postgresql.
– YouTube https://www.youtube.com/@cceste
– Instagram https://www.instagram.com/ccesteok
– Facebook https://www.facebook.com/ccesteok
– Discord https://discord.gg/ZWQVg7cgdR
Continuando con VPNs de capa 2, conectando MikroTik RouterOS v6 con Juniper Junos
Estamos en
– YouTube https://www.youtube.com/@cceste
– Instagram https://www.instagram.com/ccesteok
– Facebook https://www.facebook.com/ccesteok
– Discord https://discord.gg/ZWQVg7cgdR
00:00 Intro y musiquita
00:09 Bienvenida
00:48 Qué es el Cisco Style ID
01:22 Agregando VPLS en MikroTik
01:49 LDP Mapping Message – MikroTik
02:22 Agregando VPLS en Juniper
03:05 LDP Mapping Message – Juniper
03:53 Test CE Junin
04:28 Decodificando en Wireshark
05:28 Bridge all the things
06:16 Depende la implementación
06:45 Despedida
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.
– YouTube https://www.youtube.com/@cceste
– Instagram https://www.instagram.com/ccesteok
– Facebook https://www.facebook.com/ccesteok
– Discord https://discord.gg/ZWQVg7cgdR
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
– YouTube https://www.youtube.com/@cceste
– Instagram https://www.instagram.com/ccesteok
– Facebook https://www.facebook.com/ccesteok
– Discord https://discord.gg/ZWQVg7cgdR
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
– YouTube https://www.youtube.com/@cceste
– Instagram https://www.instagram.com/ccesteok
– Facebook https://www.facebook.com/ccesteok
– Discord https://discord.gg/ZWQVg7cgdR
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 😊
– YouTube https://www.youtube.com/@cceste
– Instagram https://www.instagram.com/ccesteok
– Facebook https://www.facebook.com/ccesteok
– Discord https://discord.gg/ZWQVg7cgdR
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.
– YouTube https://www.youtube.com/@cceste
– Instagram https://www.instagram.com/ccesteok
– Facebook https://www.facebook.com/ccesteok
– Discord https://discord.gg/ZWQVg7cgdR
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.
– YouTube https://www.youtube.com/@cceste
– Instagram https://www.instagram.com/ccesteok
– Facebook https://www.facebook.com/ccesteok
– Discord https://discord.gg/ZWQVg7cgdR