![]() ![]() This is in turn made up of things like timestamps and client IP addresses. Some wrong ways of doing things employ the use a username or session ID. Then, you need to know how the session ID is made, what information goes into it, and how the program uses encryption or hashing to keep the session ID safe. To figure out who the authenticated user is, the attacker must get some valid session ID values. If an attacker knows what is the session ID, they may be able to guess a valid session ID and get into the application. This lets an attacker get around an application's authentication system. Session prediction attacks try to guess the values of session IDs. Then, they will use this information to get private information or log into the account. ![]() This is a "session hijacking attack."Ī user's session can change in many ways by a session hijacker.Ī common way is for the hacker to use a packet sniffer to see what information is being sent and received between the user and the server. ![]() A "session hijacking attack" is when a hacker takes over a user's browser session to get personal information and passwords. Session hijacking is a way for hackers to get into a target's computer or online account. Let’s move to the types as it is not one attack but a different type: Types of session-based attack What is a session?Ī session starts when an app opens up, and it keeps track of how long and how often an app is in use. To understand this, we need to know what a session is and w hat kinds of sessions there are. How can we protect ourselves & understand what is the cause? We all can be in place of John at any time & experience the same issue. Except for the fact that the money did not hit the website account but a hacker's account. He orders it & now it is time to pay for it. If you want people to teach.Imagine John surfing on the internet. The approach you take should mirror what you are trying to teach. If you go with the latter, you will need to determine if you can replace the session generation in place or if you will write your own session management code. You either need to find an older, broken servlet engine that is vulnerable to session fixation or you need to replace the session management code. This prevents session fixation, since the server never allows the client to define the sessionid of a new session (new from the perspective of the server that doesn't have that sessionid in memory.) If there is no such session in server memory, then the servlet engine ignores the session id from the client. Whether getSession(), getSession(true) or getSession(false) is called, the server relies on its own memory to determine if there is a valid session matching the value received from the client. ![]() (as discussed in the comments) This behavior is both intentional and correct. The servlet engine you are using securely handles session cookies when you call request.getSession(), and is not vulnerable to fixation. Why is it that the original cookie c1 does not persist after the authentication? I am having trouble understanding this behavior. Which implies that the code is not vulnerable to session fixation. I found the cookies c1 and c2 to be different. Observe the cookie ( c2) after the authentication.The authentication was successful and I was redirected to LoginSuccess.jsp Enter the correct credentials in the login form.Observe the cookie ( c1) when login page loads (using an intercepting proxy).In order to test the code I deployed it using tomcat 7 and tested for session fixation: HttpSession session = request.getSession(false) //return the existing session if(obj.checkLogin(username, password))//if credentials are valid In any case a new session should not be created. Referring to the documentation I came up with the following code which when used in the servlet to create a new session, should return the existing HTTP session if it exists and otherwise it should return null. In the process of developing a vulnerable jsp/servlet based application I made an attempt to introduce the session fixation vulnerability. ![]()
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