Just like the httpOnly flag, you just need to add the secure flag in your set_cookie HTTP response header. This is why sending Data over SSL is secure. Nor will the attacker be able to decrypt the content. The attacker won’t be able to get the raw data you were sending. When it’s sent over HTTPS, all data will be encrypted from the browser and sent to the network. They are able to see the clear text data if the request is in HTTP. This can be achieved when someone (called a “Man in the Middle” attack) is monitoring all the traffic in the network of customers. How can someone read the cookie in the HTTP request? The HTTPS request will be encrypted so cookies will be safely sent across the network to your application. It will attach it only in an HTTPS request. So, when a cookie is sent to the browser with the flag secure, and when you make a request to the application using HTTP, the browser won’t attach this cookie in the request. The secure flag instructs the browser that the cookie should only be returned to the application over encrypted connections, that is, an HTTPS connection. That’s it - one down one to go! Secure Flag Meaning no JS can read it, including any external scripts. Here you can see that okie doesn’t return our session cookie. Notice the tick mark in the HTTP property. This is how it looks after adding the httpOnly flag: cookie set with httpOnly flag Like this: Set-Cookie: JSESSIONID=T8zK7hcII6iNgA Expires=Wed, 07:28:00 GMT HttpOnlyīy adding the httpOnly flag, you are instructing the browser that this cookie should not be read by the JavaScript code. It can be done by adding one word ( httpOnly) in your set_cookie http response header. We should make it only accessible for the server. The session cookie doesn’t even need to be accessible by the JavaScript client. We are not going to get into the details of it, but remember it can be done. Īnother way is by using a Cross Site Scripting Attack. Read this article I’m harvesting credit card numbers and passwords from your site. One way is to inject some untrusted third-party JS library like logging, helper utilities, etc. You might wonder how they can write this code in your Application. A JavaScript attacker can simply post this to their own server for later use. Type okie and Enter, and you will see something like this: okie usageĪs you can see, you get all the cookie info. Then open Chrome Dev Console and then tap Console Tab (Cmd + Shift+ J or Ctrl + Shift+ J). Open any web page whose cookie doesn’t have the httpOnly flag set. So in simple terms, if you don’t set the httpOnly flag, then your cookie is readable from the front end JavaScript code. For example, cookies that persist server-side sessions don't need to be available to JavaScript, and the HttpOnly flag should be set. HttpOnly Flag HttpOnly cookies are inaccessible to JavaScript's okie API they are only sent to the server. The two cookie properties (or flags) which we saw earlier ( HttpOnly and Secure) are the reason for this. Is this possible? How do they get that session ID which is in the user’s browser? So it’s the act of stealing a customer’s session ID, by which they can access your web application as if they’re that customer. Session hijacking, sometimes also known as cookie hijacking is the exploitation of a valid computer session - sometimes also called a session key - to gain unauthorized access to information or services in a computer system. This is where Session Hijacking comes into play. That’s where it gets to the point that it’s no longer safe. Their values are blank, meaning not enabled for this cookie. There are two properties in this cookie: HttpOnly (HTTP) and Secure. Well not exactly, let’s take a closer look. No sensitive information in the cookie, just the random ID (non-guessable). It looks something like this: Cookie information from Chrome Dev Console -> Applications -> Cookiesīy using this cookie, only your web server is able to identify who the user is and it will provide content accordingly. For example, in a Java web app, by default, it’s called JSESSIONID. This means that you are actually creating a cookie and sending it back to the browser. Upon successful authentication, you must create a Session for that user. You implemented all sorts of security measures during authentication. That means you will have an Authentication mechanism to get the user to your application. Let's get to it! You have an amazing web application offering a great service for customers. If you don’t have any idea about cookies or how they work, then please read this article about HTTP Cookies. You just have to understand the process and then you will know. You don’t have to be a security expert to do that. By Ramesh Lingappa What is session hijacking and how you can stop it Yummy Cookies This story is for beginners and anyone who has a basic understanding about cookies (sessions cookies), but who’s not sure how to secure them properly.
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