Crack Htpasswd John The Ripper Linux

The going with rules apply to the source code transport of John in a manner of speaking. In case you have a twofold apportionment, by then there’s nothing for you to organize and you can start using John instantly. Cracking password using John the Ripper. In Linux, mystery word hash is secured in/et cetera/shadow record. The simplest way is to let John use its default order of cracking modes: john mypasswd This will try 'single crack' mode first, then use a wordlist with rules, and finally go for 'incremental' mode. The $JOHN/john.pot file is also used to not load password hashes that you already cracked when you run John the next time. To retrieve the cracked passwords, run: john -show passwd While cracking, you can press any key for status, or 'q' or Ctrl-C to abort the session saving its state to a file ($JOHN/john.rec by default). John the Ripper is included by default with Kali 2 – which is what I am using here. To be able to crack the accounts we need two files from the target system: /etc/passwd - Containing the user information /etc/shadow - Containing the corresponding password hashes for the users. John the Ripper is one of the most popular password cracking tools available around. This free password cracking tool is chiefly written in C programming language. Encompassing a customizable.

Cracking Linux Passwords With John The Ripper
Crack Htpasswd John The Ripper Linux Server

This post assumes you have access to a the target filesystem in question and want to extract and then crack the password hashes from the local machine.

In this example I am going to crack the account passwords used in Metasploitable 2 but the techniques here can be used in many different scenarios.

John the Ripper is included by default with Kali 2 – which is what I am using here.

To be able to crack the accounts we need two files from the target system:

/etc/passwd -> Containing the user information
/etc/shadow -> Containing the corresponding password hashes for the users

(Again there are various ways you could grab these files – for a vey simple example using Metaspolitable 2 as the target see this post here: https://securityaspirations.com/2017/07/03/metasploitable-2-compromise-nfs-shares/)

Once you have the two files we can begin cracking them with John the Ripper.

However before we give the hashes to John, we need to combine the two files into one so that the user and the password hashes are merged. We can do this with a utility called ‘Unshadow’ (also included in Kali2 by default).

The command required is:

unshadow Path_to_passwd Path_to_shadow > output.txt

Now we have the combined merged.txt file:

Now lets put john to work. We could supply a password list for John to use but it comes with a default set of passwords so we may as well try those first.

Crack htpasswd john the ripper linux iso

To start the crack, point John at our newly created file:

Within a couple of seconds we appear to have a hit on most of the accounts:

It’s not always this quick and of course we are still missing the ‘root’ account but you get the idea. I let the crack run for another hour before cancelling but the root account had still not being cracked. The password may be hidden in the John password list I would just need to let the cracking process run to completion to find out. If that failed it might be worth trying some bigger password lists (such as the ‘rockyou’ list).

One way or another, once complete, you can view each of the accounts and their corresponding passwords by running the following command and referencing the original file you gave John to crack:

Cracking Linux Passwords With John The Ripper

john show <file.txt>

If you want to confirm they work, test them out on the Metasploitable box:

Password cracking is a mechanism that is used in most of the parts of hacking. Exploitation uses it to exploit the applications by cracking their administrator or other account passwords, Information Gathering uses it when we have to get the social media or other accounts of the C.E.O. or other employees of the target organization, Wifi Hacking uses it when we have to crack the hash from the captured wifi password hash file, etc.

So to be a good Ethical hacker one must be aware of password cracking techniques. Though it is easy to crack passwords by just using guessing techniques, it is very time consuming and less efficient so in order to automate the task, we have a lot of tools. When it comes to tools Kali Linux is the Operating System that stands first, So here we have a list of tools in Kali Linux that may be used for Password Cracking.

1. Crunch

In order to hack a password, we have to try a lot of passwords to get the right one. When an attacker uses thousands or millions of words or character combinations to crack a password there is no surety that any one of those millions of combinations will work or not. This collection of a different combination of characters is called a wordlist. And in order to crack a password or a hash, we need to have a good wordlist which could break the password. So to do so we have a tool in Kali Linux called crunch.

Crack Htpasswd John The Ripper Linux Server

crunch is a wordlist generating tool that comes pre-installed with Kali Linux. Selena la leyenda %5bdeluxe edition (2010 torrent. It is used to generate custom keywords based on wordlists. It generates a wordlist with permutation and combination. We could use some specific patterns and symbols to generate a wordlist.

To use crunch, enter the following command in the terminal.

2. RainbowCrack

Rainbow crack is a tool that uses the time-memory trade-off technique in order to crack hashes of passwords. It uses rainbow tables in order to crack hashes of passwords. It doesn’t use the traditional brute force method for cracking passwords. It generates all the possible plaintexts and computes the hashes respectively. After that, it matches hash with the hashes of all the words in a wordlist. And when it finds the matching hashes, it results in the cracked password.

To use RainbowCrack, enter the following comamnd in the terminal.

3. Burp Suite

Burp Suite is one of the most popular web application security testing software. It is used as a proxy, so all the requests from the browser with the proxy pass through it. And as the request passes through the burp suite, it allows us to make changes to those requests as per our need which is good for testing vulnerabilities like XSS or SQLi or even any vulnerability related to the web. Kali Linux comes with burp suite community edition which is free but there is a paid edition of this tool known as burp suite professional which has a lot many functions as compared to burp suite community edition. It comes with an intruder tool that automates the process of password cracking through wordlists.

To use burp suite:

Read this to learn how to setup burp suite.
Open terminal and type “burpsuite” there.
Go to the Proxy tab and turn the interceptor switch to on.
Now visit any URL and it could be seen that the request is captured.

4. Maltego

Maltego is a platform developed to convey and put forward a clear picture of the environment that an organization owns and operates. Maltego offers a unique perspective to both network and resource-based entities which is the aggregation of information delivered all over the internet – whether it’s the current configuration of a router poised on the edge of our network or any other information, Maltego can locate, aggregate and visualize this information. It offers the user with unprecedented information which is leverage and power.

Maltego’s Uses:

It is used to exhibit the complexity and severity of single points of failure as well as trust relationships that exist currently within the scope of the infrastructure.
It is used in the collection of information on all security-related work. It will save time and will allow us to work more accurately and in a smarter way.
It aids us in thinking process by visually demonstrating interconnected links between searched items.
It provides a much more powerful search, giving smarter results.
It helps to discover “hidden” information.

To use Maltego: Go to applications menu and then select “maltego” tool to execute it.

5. John the Ripper

John the Ripper is a great tool for cracking passwords using some famous brute for attacks like dictionary attack or custom wordlist attack etc. It is even used to crack the hashes or passwords for the zipped or compressed files and even locked files as well. It has many available options to crack hashes or passwords.

To use John the Ripper

John the ripper comes pre-installed in Kali Linux.
Just type “john” in the terminal to use the tool.

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