How to Hack Web Apps, Part 1 (Getting Started)

Welcome, budding hackers!

Before attacking any website, it’s critical to do good reconnaissance. A few minutes of recon can save you hours on a hack. Simply trying various attacks without first finding which attacks the site is vulnerable is pure foolishness.

There are a number of tools and applications to find vulnerabilities in websites, but one of the phishing website simplest (and one of my favorites) is nikto.This small and simple tool examines a website and reports back to you the potential vulnerabilities that it found that you could use to exploit or hack the site. In addition, it’s one of the most widely used website vulnerabilities tools in the industry and in many circles considered the industry standard.

Although this tool is extremely useful and effective, it is NOT stealthy. Any website with an IDS or other security measures in place will detect that you are scanning it. Originally designed for security testing, it was never meant to be stealthy.

Step 1 Fire Up Kali & Open Nikto

Let’s fire up Kali and get started with nikto. Once we have Kali up and running, go to Kali Linux -> Vulnerability Analysis -> Misc Scanners -> nikto, like in the screenshot below.

Image via wonderhowto.com

Although there are many options in using nikto, we will limit ourselves here to the basic syntax, such as this:

  • nikto -h <IP or hostname>

Step 2 Scan the Web Server

Let’s start with a safe web server on our own network. In this case, I have started the http service on another machine on my network. There is not a website hosted by this machine, just the web server. Let’s scan it for vulnerabilities by typing:

  • nikto -h 192.168.1.104

Nikto responds with a lot of information, as you can see below.

First, it tells us the server is Apache 2.2.14, probably on Ubuntu. It nailed this info and gives up more information on other potential vulnerabilities on this web server.

Note near the bottom that it identifies some vulnerabilities with the OSVDB prefix. This is the Open Source Vulnerability Database. This is a database maintained of known vulnerabilities at www.osvdb.org, in addition to other databases I covered, such as SecurityFocus and Microsoft’s Technet.

Step 3 Scan the Site

Let’s try another site. In an earlier tutorial, we had hacked a web server named webscantest.com. Let’s see what nikto can tell us about this site.

  • nikto -h webscantest.com

Once again, it identifies the server (Apache) and then proceeds to identify numerous potential vulnerabilities pre-fixed with OSVDB. We can take a look at that website at www.osvdb.org to learn more about these vulnerabilities.