![]() ![]() Doing this helps us better understand how things work under the hood. Intercepting the request means that the request will first go to Burp and then go to the browser. ![]() If Burp is open, go to Proxy > Intercept and click the Intercept Button. Now that we've set up Burp - lets look at an example of what it would be like to intercept your request. Try and re-open - Your TLS error will have gone away and you can intercept it with Burp! You have now successfully installed Burps CA certificate allowing you to navigate to HTTPS sites. Then click ok to navigate out of the Certificate Manager. Select the both trust checkboxes (this is important otherwise it will not work) and then click ok. From here, go to where you downloaded Burps file (and select it). ![]() Once downloaded, go to your browser preferences (about:preferences) and search "Cert", you should see the following:Ĭlick View Certificates, then Authorities then Import. To do, in your browser go to: and click CA Certificate. To get around this, we have Burp sign our traffic with its certificate and tell out browser to make Burps TLS singing a Certificate Authority (basically just telling the browser that anything signed by Burp is all good).įirst of, we need to get Burps certificate. As we are a man (or in this case a proxy) in the middle (MITM), the browser will think there is something wrong and will throw an error as seen above. Lots of sites have TLS (HTTPS) to encrypt the data from the client to their server. However, if we visit a HTTPS site such as: we will get a horrible TLS error: This is all traffic your browser is generating. You may also see lots of other request Burp picks up. If you navigate to a HTTP website such as Burp will pick it all up:īurp will hold the proxied request until you either stop intercepting or click the forward button. Hooorrraaaayyy, we now have Burp Suite intercepting any traffic we generate through the browser. Make sure your checkbox for running is ticked. You will find if you open Burp Suite, click Proxy and then option, there will be a proxy listener with these details: What you are doing now is proxying all of your web traffic through your local machine that is being intercepted by anything that is listening. To stop your browser from tunneling everything through to your machine first, open up your firefox network settings again and click "No proxy" You should simply have to type in 127.0.0.1 in the HTTP proxy, select the checkbox with "Use this proxy for all protocols" and type in Port 8080. Select Manual proxy configuration and copy the same config as me. On Firefox, open the preferences (about:preferences#general) and scroll to the bottom where you can see Network Settings then click on Settings. Other browsers will work, just have to find the correct browser setting. Now we have Burp installed we need to get it to intercept our traffic. You should be presented with the following interface: One you have Burp installed open the application. Configure the TLS (self-signed) certificate for HTTP S interceptingĭownload Burp from here (make sure you have Java installed too).Configure the browser to intercept all our traffic for inspection.For the purpose of this tutorial I will be using the free version. In this set of tutorials we will go through how to set up Burp to intercept traffic on your web browser. You should find that you get an alert box from the site indicating a successful XSS attack !Ĭongratulations, you bypassed the filter ! Don't expect it to be quite so easy in real life, but this should hopefully give you an idea of the kind of situation in which Burp Proxy can be useful.Burp Suite (referred to as Burp) is a graphical tool for testing web application security. This process is shown in the GIF below :įinally, press the "Forward" button to send the request. After pasting in the payload, we need to select it, then URL encode it with the Ctrl + U shortcut to make it safe to send. With the request captured in the proxy, we can now change the email field to be our very simple payload from above: alert("Succ3ssful XSS"). Submit the form - the request should be intercepted by the proxy. For example: as an email address, and "Test Attack" as a query. Now, enter some legitimate data into the support form. First, make sure that your Burp Proxy is active and that the intercept is on. Let's focus on simply bypassing the filter for now. There are a variety of ways we could disable the script or just prevent it from loading in the first place. You should find that there is a client-side filter in place which prevents you from adding any special characters that aren't allowed in email addresses :įortunately for us, client-side filters are absurdly easy to bypass. Try typing: alert("Succ3ssful XSS"), into the "Contact Email" field. ![]()
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