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How to Crack Online Web Form s with THC-Hydra & Burp Suite BY OCCUPYTHEWEB

 05/13/2016 3:29 AM

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elcome back, my hacker novitiates!

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In an earlier tutorial, I had introduced you to two essential tools for cracking online s—Tamper Data and THC-Hydra. In that guide, I promised to follow up with another tutorial on how to use THC-Hydra against web forms, so here we go. Although you can use Tamper Data for this purpose, I want to introduce you to another tool that is built into Kali, Burp Suite.

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HOW TO HACK WI-FI

Step 1

Open THC-Hydra

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So, let's get started. Fire up Kali and open THC-Hydra from Applications -> Kali Linux -> Attacks -> Online Attacks -> hydra.

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Step 2

Get the Web Form Parameters

To be able to hack web form names and s, we need to determine the parameters of the web form page as well as how the form responds to bad/failed s. The key parameters we must identify are the: IP Address of the website URL

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type of form field containing the name field containing the

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failure message We can identify each of these using a proxy such as Tamper Data or Burp Suite.

Step 3

Using Burp Suite

Although we can use any proxy to do the job, including Tamper Data, in this post we will use Burp Suite. You can open Burp Suite by going to

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Applications -> Kali Linux -> Web Applications -> Web Application Proxies -> burpsuite. When you do, you should see the opening screen like below.

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Next, we will be attempting to crack the on the Damn Vulnerable Web Application (DVWA). You can run it from the Metasploitable operating system (available at Rapid7) and then connecting to its page, as I have here.

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We need to enable the Proxy and Intercept on the Burp Suite like I have below. Make sure to click on the Proxy tab at the top and then Intercept on the second row of tabs. Make certain that the "Intercept is on."

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Last, we need to configure our IceWeasel web browser to use a proxy. We can go to Edit -> Preferences -> Advanced -> Network -> Settings to open the Connection Settings, as seen below. There, configure IceWeasel to use 127.0.0.1 port 8080 as a proxy by

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typing in 127.0.0.1 in the HTTP Proxy field, 8080 in the

Port field and delete any information in the No Proxy for field at the bottom. Also, select the "Use this proxy server for all protocols" button. THE HACKS OF MR. ROBOT

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Step 4

Get the Bad Response

Now, let's try to with my name OTW and OTW. When I do so, the BurpSuite intercepts the request and shows us the key fields we need for a THC-Hydra web form crack.

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After collecting this information, I then forward the request from Burp Suite by hitting the "Forward" button to the far left . The DVWA returns a message that the " failed." Now, I have all the information I need to configure THC-Hydra to crack this web app!

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Getting the failure message is key to getting THC-Hydra to work on web forms. In this case, it is a text-based message, but it won't always be. At times it may be a cookie, but the critical part is finding out how the application communicates a failed . In this way, we can tell THC-Hydra to keep trying different s; only when that message does not appear, have we succeeded.

Step 5 Place the Parameters into Your THC Hydra Command Now, that we have the parameters, we can place them into the THC-Hydra command. The syntax looks like this:

kali > hydra -L <name list> -p < list>

So, based on the information we have gathered from Burp Suite, our command should look something like this:

kali >hydra -L <wordlist> -P< list> 192.168.1.101 http-post-form "/dvwa /.php:name=^^&=^^& =: failed" A few things to note. First, you use the upper case "L" if you are using a name list and a lower case "l" if

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you are trying to crack one name that you supply there. In this case, I will be using the lower case "l " as I will only be trying to crack the "" . After the address of the form (/dvwa/.php), the next field is the name of the field that takes the name. In our case, it is "name," but on some forms it might be something different, such as "." Now, let's put together a command that will crack this web form .

Step 6

Choose a Wordlist

Now, we need to chose a wordlist. As with any dictionary attack, the wordlist is key. You can use a custom one made with Crunch of CeWL, but Kali has numerous wordlists built right in. To see them all, simply type:

kali > locate wordlist In addition, there are numerous online sites with wordlists that can be up to 100 GB! Choose wisely, my hacker novitiates. In this case, I will be using a built-in wordlist with less than 1,000 words at:

/usr/share/dirb/wordlists/short.txt

Step 7

Build the Command

Now, let's build our command with all of these elements, as seen below.

kali > hydra -l -P /usr/share/dirb/wordlists /small.txt 192.168.1.101 http-post-form "/dvwa /.php:name=^^&=^^& =: failed" -V

-l indicates a single name (use -L for a name list) -P indicates use the following list

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http-post-form indicates the type of form /dvwa/-php is the page URL name is the form field where the name is entered ^^ tells Hydra to use the name or list in the field is the form field where the is entered (it may be wd, , etc.) ^^ tells Hydra to use the list supplied indicates to Hydra the failed message failed is the failure message that the form returned -V is for verbose output showing every attempt

Step 8

Let Her Fly!

Now, let her fly! Since we used the -V switch, THC-Hydra will show us every attempt.

After a few minutes, Hydra returns with the for our web application. Success!

Final Thoughts Although THC-Hydra is an effective and excellent tool for online cracking, when using it in web forms, it takes a bit of practice. The key to

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successfully using it in web forms is determining how the form responds differently to a failed versus a successful . In the example above, we identified the failed message, but we could have identified the successful message and used that instead. To use the successful message, we would replace the failed message with "S=successful message" such as this:

kali > hydra -l -P /usr/share/dirb/wordlists /small.txt 192.168.1.101 http-post-form "/dvwa /.php:name=^^&=^^& S=success message" -V Also, some web servers will notice many rapid failed attempts at logging in and lock you out. In this case, you will want to use the wait function in THC-Hydra. This will add a wait between attempts so as not to trigger the lockout. You can use this functionality with the -w switch, so we revise our command to wait 10 seconds between attempts by writing it:

kali > hydra -l -P /usr/share/dirb/wordlists /small.txt 192.168.1.101 http-post-form "/dvwa /.php:name=^^&=^^& =: failed" -w 10 -V I recommend that you practice the use of THC-Hydra on forms where you know the name and before using it out "in the wild." Keep coming back, my hacker novitiates, as we continue to expand your repertoire of hacker techniques and arts! Cover image via Shutterstock

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