📌 Session Fixation Summary
Session fixation is a type of security vulnerability where an attacker tricks a user into using a specific session ID. If the web application does not properly generate a new session ID after login, the attacker can gain access to the user’s session. This means the attacker can impersonate the user and access private information or actions within the application.
🙋🏻♂️ Explain Session Fixation Simply
Imagine you are given a ticket to a concert, but someone else knows the ticket number. If you use that ticket, they can sneak in and sit in your seat because they have the same number. Session fixation works similarly, where someone can use your session if they know its ID.
📅 How Can it be used?
Ensure your web application generates a new session ID after each successful login to prevent session fixation attacks.
🗺️ Real World Examples
A shopping website allows users to log in but does not change the session ID after login. An attacker sends a crafted link with a fixed session ID to a victim. When the victim logs in using that link, the attacker can use the same session ID to access the victim’s shopping account and view personal information.
An online banking platform fails to renew session IDs after login. An attacker sets up a phishing page that assigns a known session ID, then tricks a user into logging in. The attacker then accesses the account using the same session ID, viewing balances and making unauthorised transfers.
✅ FAQ
What is session fixation and why should I care about it?
Session fixation is a security issue where someone can trick you into using a session ID that they already know. If the website does not change this ID when you log in, the attacker can use the same session and pretend to be you. This could let them see your private information or take actions as if they were you. It is important because it puts your personal details and online safety at risk.
How can I tell if a website is vulnerable to session fixation?
Most people will not notice session fixation just by using a website. However, if you log in and your session ID stays the same as before, it could be a sign that the website is not protecting you properly. Usually, well-designed sites will give you a fresh session ID as soon as you log in.
What can websites do to protect users from session fixation?
Websites can protect users by making sure they always create a new session ID when someone logs in. This simple step makes it much harder for attackers to hijack your session. Other good habits include using secure cookies and keeping software up to date to stop attackers from finding ways in.
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