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Safari User Guide

Your network administrator may ask you to specify a proxy server to access the internet if your Mac connects to it through a firewall. Your administrator should tell you the type of proxy server to specify, the IP address or host name, and a port number.

  1. In the Safari app on your Mac, choose Safari > Preferences, then click Advanced.

  2. Click Change Settings (next to Proxies) to open the Network pane of System Preferences.

  3. Change the proxy settings using the information your network administrator provided.

  4. Click OK.

The Burp Suite can act as an interrupting proxy and also captures traffic between an internet browser and a web server. Other features of the Burp Suite include a scanner, application-aware spider, intruder, repeater, sequencer, comparer, extender, and decoder. Burp Suite is a tool developed by Portswigger, which is used for penetration testing of web applications. We can perform lots of tasks using burp suite like modification, brute force attack, crawling, etc. It is generally used by security researchers to check possible vulnerability in a website.

Introduction

Proxies like the one included in Burp Suite are designed for traffic interception. This allows the owner of the proxy to view, modify and drop packets passing through the proxy. While this can certainly be used for criminal purposes, it can also be used by cyberdefenders to protect against malware and dangerous user behavior.

In this article, we’ll discuss how to use Burp Suite to intercept Web traffic, both encrypted and unencrypted. We’ll start with unencrypted traffic (HTTP) and then cover the modifications necessary for HTTPS.

Intercepting HTTP Traffic

The first step to intercepting web traffic with Burp Suite is installing it on your system. The Burp Suite Community Edition is available from PortSwigger. After installing and opening Burp Suite, you’ll see a screen similar to the one below. [CLICK IMAGES TO ENLARGE]

When using Burp Suite as a proxy, it’s a good idea to ensure that the proxy is active. As shown in the screen above, this information is found under Proxy in the first row of tabs and Options in the second row. Note that the Burp proxy runs on 127.0.0.1:8080 by default.

If the proxy is running, the next step is setting up a Web browser to use the proxy. In this example, we’re using Chrome, so these settings can be found by opening Options and searching for Proxy as shown below.

Clicking on the “Open proxy settings” button in the above screen opens up the computer’s Internet Settings. As shown in the screen below, we’re using Windows for this example.

In the above screen, click on the LAN settings button, which opens the screen below. At the bottom of this screen is the computer’s proxy settings.

As shown above, we’ve set the proxy settings for the computer to Burp Proxy’s default address and port (127.0.0.1 and 8080). If you’ve changed this information for your Burp Suite instance, use your modified values here.

When complete, click OK and attempt to browse to a website. For this example, we’ve used an HTTPS site. As a result, we see the warning below.

Clicking Advanced and Proceed to site allows us to actually visit the website. At this point, take a look at Burp Proxy. Under the Proxy → Intercept tab, you can see the requests as they move through. As shown below, we see the GET request for the requested website.

Forwarding the requests in Burp eventually allows the webpage to load (as shown below).

However, as shown in the address bar, the site is not considered secure. This is because Burp breaks the certificate chain between the client and the server and uses its own certificate instead. Since Burp’s certificate is self-signed and untrusted by the browser, Chrome makes it obvious to the user that this isn’t a secure connection.

But what if we try to visit a site using HTTPS Strict Transport Security (HSTS), where the site requires that a secure connection is made between the server and the client? The image below shows an attempt to browse to Google while Burp is performing interception.

As shown in the screen above, Chrome gives you no option to continue on to the untrusted site. Since Burp is providing its own (untrusted) certificate to the client, the connection is completely untrusted and not allowed to continue. In order to visit Google, we need to get Chrome to trust Burp Proxy’s certificate.

Making the jump to HTTPS

Burp Proxy generates its own self-signed certificate for each instance. In order to get a copy of your Burp CA certificate, browse to 127.0.0.1:8080 (or wherever your Burp Proxy instance is running). Once there, you’ll see the screen below.

Logic pro 10. In the screen above, click on CA certificate in the top right corner. This will allow you to save a copy of your CA certificate to your computer.

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Once you have the certificate, you need to mark it as trusted in your browser. In Chrome, this option is under Settings → Advanced Settings → Privacy and Security. At the bottom of the screen below is an option to manage certificates.

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Clicking on “Manage certificates” will open up a window for managing certificates locally on your computer. On Windows, you will see the screen below.

To force Chrome to trust Burp’s certificate, move to the Trusted Root Certification Authorities tab and click Import. Click through the prompts and point it to your newly downloaded certificate. Once you have received a success message, restart both Burp and your browser.

Browsing to our original site on infosec.com, we no longer get an error message about an untrusted certificate. Examining the certificate (shown below), we see that Chrome is perfectly happy to accept a certificate signed by PortSwigger CA, which is the company that makes Burp Suite.

But what about interception for sites enforcing HTTPS via HSTS? Browsing to Google again throws no errors and, as shown below, Chrome accepts the PortSwigger CA certificate as valid.

At this point, we’re capable of intercepting any Web traffic using Burp Proxy.

Conclusion: Applications and limitations of HTTPS interception

As mentioned above, interception of HTTPS traffic is valuable for both benign and malicious purposes. A cyberdefender who can unwrap the encryption provided by TLS may be able to detect and remediate malware infections or threat actor intrusions on the corporate network. However, an attacker with the same capabilities poses a significant threat to the privacy and security of users on the network.

The fact that the user needs to trust the Burp proxy certificate can be an annoyance to the defender but is a significant bonus when dealing with malicious parties. An organization can force trust of the Burp CA (and many have similar policies for organizational root CA certificates for deep packet inspection), but this makes it necessary to appropriately protect the Burp proxy instance. Anyone with access to the private key corresponding to Burp’s self-signed certificate has the ability to read any data sent by browsers using the proxy.

Sources

  1. Download Burp Suite Community Edition, PortSwigger
  2. Intercepting HTTP and HSTS enabled HTTPS / SSL traffic on Chrome/Firefox using Burp Suite, Zeroday-Security

Burp Suite comes with its own embedded Chromium browser, which is ready to use for a variety of manual and automated testing purposes.

Manual testing with Burp's embedded browser

Instead of using an external browser, you can use Burp's embedded browser to manually test your target website or application. This provides several key advantages. Most notably, the embedded browser is preconfigured to work with the full functionality of Burp Suite right out of the box. All of the necessary proxy listener settings are automatically adjusted for you. This means you can launch Burp for the first time and immediately start testing without performing any additional configuration. This includes testing over HTTPS.

Open Browser Proxy

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To use the embedded browser, go to the 'Proxy' > 'Intercept' tab and click 'Open browser'. You can then visit websites and perform any manual actions just like you would with any other browser. All in-scope traffic will automatically be proxied through Burp. This means that as you browse your target website, you can take advantage of Burp Suite's manual testing features. For example, you can intercept and modify requests using Burp Proxy and study the complete HTTP history from the corresponding tabs. You can then send these requests to other tools, such as Burp Repeater and Burp Intruder, to perform additional testing of interesting items that you encounter.

While you browse, Burp's default live tasks will also passively crawl and audit the locations that you visit. This will automatically populate the site map and report any potential security issues as they are identified.

Read more

How to use Burp Suite for penetration testing

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If you prefer, you can still use an external browser for testing. In this case, you just need to perform some additional configuration steps.

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Scanning websites with Burp's embedded browser

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Burp's embedded browser offers a convenient way to perform manual testing with minimal setup. However, it is perhaps even more powerful when integrated into your automated testing workflow through browser-powered scanning with Burp Scanner.

Burp Suite Tools

Embedded browser health check

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If you are experiencing any issues with the embedded browser, you can use the 'Embedded Browser Health Check' tool to help diagnose the problem. You can access this tool from the 'Help' menu. The health check runs a series of tests to check whether the embedded browser is working correctly and provides feedback on any issues that arise.