But along the way, the attacker has gained access to the session. The attacker can then pass requests from the client to the server and respond without detection from either. In a man-in-the-middle attack, an attacker sits between the web server and the client. This cookie will have the session ID which can then be hijacked. As you’ve learned, that traffic will ultimately contain a request with a session cookie in it. In session sniffing, an attacker can use a sniffing application such as Wireshark or a proxy to capture network traffic between a client and server. The attacker could then try to pass the session ID 12344 or 12343 to the server in an attempt to hijack a session from another user. An attacker could log in, create a new session, and see their session ID is 12345. Suppose your session IDs were sequential integers. It is very important that this session ID is properly randomized, such that an attacker cannot simply guess a few options and bypass any security associated with the session ID. Session PredictionĮach session has an associated session ID with it. For now, let’s take a look at some common session security concerns. You will see a few examples of that later in this article. Session Management RisksĪs an aside, I should note that it’s generally better to use a well-established session management library than to roll your own. Most security concerns should be addressed by you, the developer and maintainer of the application and the developer of whatever session management library you’re using. The majority of your users aren’t necessarily bad actors, but bad actors are certainly looking for ways to exploit your application. Of course, any time an application sends information to the client it could possibly end up in an enemy’s hands. The server can use this information to access the user’s shopping cart in the server’s store. For example, the cookie may tell the application the session ID and that the user is authenticated. This enables the application to split the session data between that which is stored on the client-side and that which is stored on the server. The session is given an ID that both the client and server can reference. If this is the first time a user has requested your site, the server will create a new session cookie and return it to the client. When a user sends a request to your web application, they will add a session cookie to the request headers. There are many ways to streamline this effort, but for the sake of this article, I will focus on cookie-based sessions. If the application were to transmit all this data back and forth on each request, you would introduce massive security and performance concerns. For example, is the user authenticated? Is he/she authorized to view a specific page? Does the user have a shopping cart that needs to be displayed? All this information that makes the user experience feel seamless, as though he/she is using one continuous application, must be transmitted from the client to the server. The user’s request must contain all the necessary information for the server to make a decision. The server then knows what to do with this request and returns a response. When a user uses your web application, they make an HTTP request to the webserver. In this article, you will learn what sessions are, how to manage them in Node.js, and some details that should help you minimize bugs and vulnerabilities. Hopefully, I can remove some of the magic behind session management in NodeJs and give you a good fundamental place to start. Usually, this means a late night trying to figure out a vulnerability, a bug, or how to work with a new session management library. Most of the mechanics of session management are abstracted away from developers, to the point where they don’t properly learn about it until it’s necessary. editor.Session Management is a pretty scary term for a lot of developers. The REPL knows when you are typing a multi-line statement without the need to invoke. exit: exits the repl (same as pressing ctrl-C two times) save: saves all you entered in the REPL session to a file (specify the filename) load: loads a JavaScript file, relative to the current working directory clear: resets the REPL context to an empty object and clears any multi-line expression currently being input. break: when inputting a multi-line expression, entering the. Once you are in this mode, enter ctrl-D to run the code you wrote. editor: enables editor mode, to write multiline JavaScript code with ease. The REPL has some special commands, all starting with a dot. If you press the up arrow key, you will get access to the history of the previous lines of code executed in the current, and even previous REPL sessions. If after some code you type _, that is going to print the result of the last operation.
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