Testing TCP/UDP baseline functionality with Netcat & Curl through CLI(SSH)

-
Here I am showing how to setup a simple Netcat listening server to test baseline functionality of TCP/UDP connections. I create a simple document and save it as technical.txt that I will send to my server I am testing.

Here I create the simple document.

On the server for phub.info I setup a Netcat listener at port 8888 that is ready to receive the specific document. 

Now from the 'HQ-cloud-green' server I get ready to receive the document with another Netcat server.


To confirm receipt of the file I open it and view the contents from the terminal.
Great so now I can send messages back and forth but I want to test things a little further. I want to know how this connection port and the data being sent through it will be interpreted by browsers. With Netcat I can create a simple HTTP server to serve up content to browsers to see if my server is configured correctly. Here I pulled the data from the URL with cURL and you can see the HTML for the test page I am serving from the Netcat server.


And now when I visit port 8888 at my IP for phub.info (this is just a cloud droplet I spun up and destroyed after this example) I get the following output below and can confirm correct functionality of TCP & UDP.


Comments

Post a Comment

Popular posts from this blog

Automated Exploitation of a Bluetooth vulnerability that leads to 0-click code execution

-
Image
This blog post covers an interesting vulnerability that was just discovered earlier this year and an open source free tool that was created to automate testing for this vulnerability in Bluetooth devices.  I will preface this with the warning that this is of course done in my personal testing lab environment with my own devices for learning and demonstration purposes. I am in no way encouraging that these tools, snippets of code or techniques be used maliciously as there can be very serious legal consequences for those that use these hacking tricks nefariously. However, in a personal testing lab environment I think this is great for learning and allows someone to quickly be able to confirm or deny if their personal devices are truly standing up to the Bluetooth CVE of CVE-2023-45866 . CVE-2023-45866 is described as an issue where the " Bluetooth HID Hosts in BlueZ may permit an unauthenticated Peripheral role HID Device to initiate and establish an encrypted connection, and accept
Read more

Sniffing GSM traffic on a private cellphone network

-
Image
Legal Disclaimer: GSM Research and Passive Traffic Monitoring ‘The information provided in this blog is for educational and informational purposes only. The author and publisher of this blog are not responsible for any misuse, illegal activities, or damages that may arise from the use of the information provided herein. The author conducted research using two Samsung phones and a BladeRF with YateBTS to create a small-scale GSM network for the purpose of analyzing and intercepting traffic. It is important to note that intercepting or tampering with wireless communication without proper authorization is illegal in many jurisdictions. The author undertook this research within a controlled and lawful environment, and any techniques or findings described in this blog should not be replicated or applied in unauthorized or illegal activities. The author strongly advises against engaging in any illegal activities, including but not limited to intercepting or tampering with wireless communicat
Read more

Raspberry Pi WiFi Honeypot 🍯

-
Image
This was a fun project to work on and build out. I learned a few new interesting tricks along the way. I started with this tutorial from 2013 by Andy Smith . However, a few things have changed with hostapd that I had to figure out through debugging. Also, the configuration of the nginx server as well as dnsmasq were slightly different for me using the new Raspbian Buster for Raspberry Pi 4.  This should save you some time if you follow my trick tips later on in the article that I found by searching through various message boards and googling error messages as I did debugging to get this working properly. I have gone over setting up nginx servers in previous articles so if you need help with getting started these may be helpful. So first things first. I started with a canakit and assembled the raspberry pi with the appropriate heat sinks and a little fan set to a standard speed. The speed is adjusted by how you install the wiring. If you haven't done this before you can follow the
Read more