Session Hijacking Attacks

Myra Jarenga
OSINT for all
Published in
4 min readDec 7, 2023

Introduction

Have you ever considered the vulnerability of your online sessions to a secret and potentially devastating attack known as “Session Hijacking”? Let me help you understand why this threat is crucial in safeguarding your digital activities. In this article, I will be helping you understand the complexities of Session Hijacking, breaking down the risks into simple terms so that everyone can comprehend.

But first let me help you understand what a session is. A session is like a conversation between you and a website you are visiting online at that particular moment. When you visit a site and log in, you’re essentially starting a chat. This chat is what we call a session. The session allows the website to recognize you as you click around, add items to your cart, or customize settings. It’s like having an ongoing talk, and the website remembers what you said earlier in the conversation. So, when you’re “logged in,” it’s as if the website is saying, “Ah, it’s you again! Let’s pick up where we left off.” That’s a session — a continuous, personalized chat between you and the website.

So, what is a Session Hijacking?

In the virtual world, when you log into an account or website, a session is established as we have identified above. Session Hijacking occurs when an unauthorized user gains control of this session, essentially stealing your online identity and potentially wreaking havoc.

Now let's understand some of the session hijacking attacks that happens when your session is hijacked.

Man-in-the-Middle (MitM) Attacks

Picture a scenario where someone intercepts your mail before it reaches your mailbox. In the digital realm, a Man-in-the-Middle attack involves an intruder secretly intercepting and relaying the communication between two parties. This allows them to hijack the session and potentially gain access to sensitive information. The picture below explains what happens.

Session Sidejacking (Session Sniffing)

Imagine sitting in a cafe, and someone nearby is eavesdropping on your conversation. In the digital world, Session Sidejacking involves intercepting unencrypted session cookies. These cookies are like digital identifiers, and if intercepted, can grant the attacker unauthorized access to your online accounts.

Cross-Site Scripting (XSS)

Envision a situation where you visit a seemingly harmless website, but behind the scenes, malicious code is injected into your browser. In a Cross-Site Scripting attack, this code can be used to steal your session information, enabling the attacker to impersonate you on the targeted website.

How do you Fortifying Your Digital Defenses Against this type of an attack ?

In order to understand how you can protect yourself against such an attack let me use practical tips to help you understand how you can go about it.

  1. Use HTTPS. Practical Tip- Install browser extensions that force HTTPS connections whenever possible. This ensures that your sensitive information, including session data, is transmitted securely.
  2. Secure Wi-Fi Connections. Practical Tip- Avoid accessing sensitive accounts on public Wi-Fi networks. If you must use public Wi-Fi, consider using a Virtual Private Network (VPN) to add an extra layer of encryption.
  3. Strong Authentication Practices. Practical Tip- Enable multi-factor authentication (MFA) on all your accounts that support it. Even if a session is hijacked, MFA acts as a second line of defense.
  4. Regularly Log Out. Practical Tip- Set automatic log-out times on your accounts, especially on shared or public computers. This ensures that even if you forget to log out, the session will be terminated after a certain period of inactivity.
  5. Keep Software Updated. Practical Tip- Enable automatic updates for your browsers and other software to ensure that you’re protected against known vulnerabilities. Many session hijacking attacks exploit outdated software.

In Conclusion

By implementing these practical tips, you actively fortify your digital defenses against Session Hijacking. Safeguard your online identity and stay one step ahead of potential threats.

Thanks to https://skillsforall.com/ Platform I am learning endpoint security, and I am way a head in identifying such session attacks. If you would like to connect with me you can do so on LinkedIn Myra Jarenga, you can also send me a DM on X @myrajarenga for us to chat more on this topic. You can support me by following me in order to learn more every week in order to learn how to stay secure online. Thank you.

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Myra Jarenga
OSINT for all

A Cybersecurity analyst with customer service experience and AI expert.