Burpsuite Setup

Introduction :

Burpsuite is a Java Application developped by PortSwigger which is used as a pentest framework for web applications. In this tutorial we're going to look at how it can be commonly used.

Installation

First let's install FoxyProxy

Then we install burpsuite:

apt install burpsuite

Intercepting HTTP requests

Now let's configure FoxyProxy to intercept the request we make to the server:

Now let's test it:

So here we intercepted the request we made for the server, we didn't forward it yet.

GET /login.php HTTP/1.1
Host: previse.htb
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:99.0) Gecko/20100101 Firefox/99.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: close
Cookie: PHPSESSID=s4pu8loq7vmi15a095ipjl1095
Upgrade-Insecure-Requests: 1

Usually what we want to do is test what we can send to the web server, repeatedly. To do that we use the repeater tab (CTRL+R to send the request to the repeater tab and CTRL+SHIFT+R to go to the repeater tab):

So from here we can change the request and keep sending it to check how the web server behaves differently:

Intercepting HTTPS requests

Now that we managed to intercept our HTTP request let's do the same with HTTPS, it requires a little more setup:

While the intercept is on, let's go to http://burp in order to download burpsuite's certificate:

[ 10.10.14.68/23 ] [ /dev/pts/20 ] [~/Downloads]
→ file cacert.der
cacert.der: Certificate, Version=3

And now with this we want our firefox browser to consider this certificate as secure, via a security exception:

Now with this change we can intercept HTTPS traffic:

Now do the 2 keybinds to send the request to the repeater tab:

And there you have it ! We have been able to intercept both HTTP and HTTPS traffic via burpsuite to debug how websites respond to our requests!

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