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Wednesday, 6 November 2019

CSRF cross site request forgery attack


CSRF cross site request forgery attack






XSRF CSRF Cross site request forgery is a web security vulnerability that allows an attacker to induce users to perform actions that they do not intend to perform. It allows an attacker to partly circumvent the same origin policy,  which is designed to prevent differnet websites from interfering with each other. csrf spring
In a CSRF attack an innocent end user is tricked by an attacker into submitting a web request that they did not intend. This may cause actions to be performed on the website that can include inadvertent client or server data leakage, change of session state, or manipulation of an end user's account.csrf token header


First of all, we know what a CSRF attack is and after this we will also watch a practical video, basically we make a fake request from the attackers and send that fake request to any web application and we send a request. We send it to the web application because if we are able to get them to do the unwanted action, then what is included in it, in this we transfer money, email To change the password, we can change the password, then we take an example of money transfer. csrf cors




CSRF cross site request forgery attack




The one who is an attacker finds out about his Victim through social engineering that his Victim Site by Site is doing Net Banking and talking to you, through Social Engineering only you have a request. Sends and Victim is told to click on that link and you can win lots and lots of prizes like lottery.
You click Victim on that link but it is a fake link and it gets redirected to Net Banking's website and as soon as it is redirected and the fake request is executed.
csrf laravel

And there is a fake request that the money is transferred to my account, that is, in the account of the attacker and there are fake requests, from there, the amount of money that the attacker has put in it is transferred to the account of the attacker. So here it is, an CSRF example
And if your Victim is a normal user, then you can transfer money to your Victim in a very easy way, change the email, change the password and if your Victim runs an administrative account, and any website of owner of your victim, So in that we can hack the entire web application



How Does CSRF Work ?


For a CSRF attack to be possible, three key conditions must be in place:

A relevant action. There is an action within the application that the attacker has a reason to induce. This might be a privileged action (such as modifying permissions for other users) or any action on user-specific data (such as changing the user's own password). Cookie-based session handling. Performing the action involves issuing one or more HTTP requests, and the application relies solely on session cookies to identify the user who has made the requests. There is no other mechanism in place for tracking sessions or validating user requests. No unpredictable request parameters. The requests that perform the action do not contain any parameters whose values the attacker cannot determine or guess. For example, when causing a user to change their password, the function is not vulnerable if an attacker needs to know the value of the existing password.  CSRF cross site request forgery attack 


For example, suppose an application contains a function that lets the user change the email address on their account. When a user performs this action, they make an HTTP request like the following:
csrf vs xss csrf post example

POST /email/change HTTP/1.1
Host: vulnerable-website.com
Content-Type: application/x-www-form-urlencoded
Content-Length: 30
Cookie: session=yvthadfafWwyeQkAPzeQ5gHgTvlyHgfyTfE

email=willi@normal-user.com

This meets the conditions required for CSRF:


The action of changing the email address on a user's account is of interest to an attacker. Following this action, the attacker will typically be able to trigger a password reset and take full control of the user's account. The application uses a session cookie to identify which user issued the request. There are no other tokens or mechanisms in place to track user sessions.
The attacker can easily determine the values of the request parameters that are needed to perform the action. With these conditions in place, the attacker can construct a web page containing the following HTML:



<html>
  <body>
    <form action="https://vulnerable-website.com/email/change" method="POST">
      <input type="hidden" name="email" value="packard@evil-user.net" />
    </form>
    <script>
      document.forms[0].submit();
    </script>
  </body>
</html>




If a victim user visits the attacker's web page, the following will happen:

The attacker's page will trigger an HTTP request to the vulnerable web site.
If the user is logged in to the vulnerable web site, their browser will automatically include their session cookie in the request (assuming SameSite cookies are not being used).
The vulnerable web site will process the request in the normal way, treat it as having been made by the victim user, and change their email address. csrf attack tutorial
Note
Although CSRF is normally described in relation to cookie-based session handling, it also arises in other contexts where the application automatically adds some user credentials to requests, such as HTTP Basic authentication and certificate-based authentication.



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 VIDEO TUTORIAL :-  


     









My Self Kumar Atul Jaiswal Urf HackerboY and Kumar Atul Jaiswal is a name among millions who struggled failed and surged ahead in search of how to become a Hacker ( passionate about Hacking just like profession an entrepreneur ), just like any middle class guy, he too had a bunch of unclear dreams and a blurred version of his goals in life 😊.

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