[realsunjester]

One of the first things we need to do is install Joomla. If you need a tutorial for it (which I hope not) you can look at one here. Next, we need to find a way to determine if a website is actually a Joomla based website. First, we should establish a way to accept arguments, one of which will be the URL in question.

Code

/* joomla exploit scanner by sunjester */
using System;

namespace Jex
{
       class Scanner
       {
               private static string url = string.Empty;

               static void Main(string[] args)
               {
                       for(int i=0;i<args.Length;i++)
                       {
                               switch(args[i])
                               {
                                       case "-url":
                                               Scanner.url = args[i+1];
                                               Console.WriteLine(Scanner.url);
                                       break;
                               }
                       }
               }

               static bool isJoomla()
               {
                       return true;
               }
       }
}

Above the code has two methods. A main method that is accepting arguments and a method named isJoomla(), that will eventually determine if a website we provide to "Jex" (our joomla exploit scanner) is a Joomla based website. Below you can see how to compile and run Jex, and running it with an argument called -url.



We are going to need a method to get the source of a website or just a way to get the response code or a URL. Below you can see how we implemented the code and how it works.

Code

               static string getResponseCode()
               {
                       if(Scanner.url == string.Empty) return "404";

                       HttpWebRequest req = (HttpWebRequest)WebRequest.Create(Scanner.url);
                       req.AllowAutoRedirect = false;
                       HttpWebResponse res = (HttpWebResponse)req.GetResponse();
                       return ((int)res.StatusCode).ToString();
               }

In the video you can see that we have an error when the site returns a 404, we will address that with a simple try/catch block, but that's not important. In the video you can see we check for the directory administrator/. That directory is the default directory in Joomla for the admin panel, and on that page the default image is "joomla.png", we could use that as a way to check for a valid Joomla install. So that directory will be one to check for. 

After thinking about it for a moment I thought of a simple way to determine at what percentage the site may be a Joomla site. We can check the directories and based on how many are found is a way to determine the percentage at which we think the site is a Joomla based website. For example, if we have 13 directories to check and 7 of them are 202 responses, our percentage is 54% (rounded up). Using this kind of formula (a simple one) we can eliminate the need to scan unwanted websites.

Code

                static float isJoomla()
                {
                        int found = 0;
                        float perc;

                        string[] joomlaDirs = {
                                "administrator/",
                                "templates/protostar/favicon.ico"
                        };

                        foreach(string dir in joomlaDirs)
                        {
                                string curUrl = Scanner.url + dir;
                                Console.WriteLine("Checking directory: " + curUrl);

                                if(getResponseCode() == "200")
                                {
                                        found++;
                                }
                        }

                        perc = (found/joomlaDirs.Length)*100;
                        return perc;
                }

So let's see if we can find some more directories to check in order to determine the percentage level for a possible Joomla based website. You can add more as you find them, however, let's go ahead and try this out on a live website.



Now obviously not all Joomla sites will have the above directories we are trying but the default ones, probably vulnerable ones, will.