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CSRF(Cross-Site Request Forgery)

It was fun and interesting to search how CSRF attack happens and how we can prevent it. There are reasons that attackers use to attack. Also there are solutions that we can adopt to prevent these attacks. Simply, you have a web form on your site, and attacker builds a web form that is similar to yours then the attacker can possibly attack on your form. Back to 2008, johng77536 used CSRF to increase follower numbers (http://www.zdnet.com/blog/security/csrf-vulnerability-allows-twitter-follow-abuse/1611). Also CSRF was used on Digg.com to rate stories (http://www.codewalkers.com/c/a/Miscellaneous/Stopping-CSRF-Attacks-in-Your-PHP-Applications/). Ronen Zilberman, a security researcher found issues with CSRF on Facebook (http://www.internetnews.com/security/article.php/3835596/Facebook-Hit-by-Cross-Site-Request-Forgery-Attack.htm). DO you want to know more? The biggest and successful CSRF attack happened in Korean in 2008. Korea’s Ebay site: Auction.com was targeted and about 18 million accounts’ information was stolen. According to Wikipedia, attacker sent emails to Auction and made them to check that email. When the admin opened that email, malicious code was activated and it sent the admin’s identification information to the attacker. In that way, attacker stole users account’s information.
The attack’s interaction is really simple. While you are logged in on some web site, it only verifies logged in user with cookie. An attacker can get log-in cookie information by letting users to download request forgery code.

How to prevent CSRF attack? Let’s ask code developer in your company.
Well, simply we need to take three steps:
1. Generate a key
2. Store that key
3. Add that key on web form
4. When GET or POST request initiates, check if there is a key.

Here is simple code sample:

  1. session_start();
  2. $sess_var = $SOMERANDOMDATA;
  3. if (!$sess_var) {
  4.     session_register("sess_var");
  5. }
  6.  
  7. if($_SERVER['REQUEST_METHOD'] == 'POST')
  8. {
  9.     if(!isset($_SESSION['csrf']) || $_SESSION['csrf'] !== $_POST['csrf'])
  10.     {
  11.          echo "Fuck, you wanna die? then,"
  12.          die("Die here.");
  13.     }
  14.     //Do whatever you want.
  15. }
  16.  
  17. //Generate a key, print a form:
  18. $key = md5(session_id());
  19. $_SESSION['csrf'] = $key;
  1. <code><form action="this.php" method="post">
  2. <input type="hidden" name="csrf" value="<?php echo $key; ?>" />
  3. <input type="text" name="newemail" />
  4. <input type="submit" name="submit" value="Submit" />
  5. </form></code>

Ref:

http://en.wikipedia.org/wiki/Cross-site_request_forgery

http://www.owasp.org/index.php/PHP_CSRF_Guard

http://www.rodsdot.com/asp/CSRF_Form_Protection.asp

http://www.codewalkers.com/c/a/Miscellaneous/Stopping-CSRF-Attacks-in-Your-PHP-Applications/

http://codeutopia.net/blog/2008/10/16/how-to-csrf-protect-all-your-forms/

http://web.mit.edu/net-security/Camp/2003/clambert-slides.pdf

http://en.wikipedia.org/wiki/Cross-site_request_forgery

http://codeutopia.net/blog/2008/10/16/how-to-csrf-protect-all-your-forms/


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