Science Knowings: JavaScript Course For Social Media

Cross-Site Request Forgery (CSRF)

XSS Recap

In our previous session, we discussed Cross-Site Scripting (XSS), where attackers inject malicious scripts into web pages. Now, let's dive into Cross-Site Request Forgery (CSRF), a different type of web attack.

What is CSRF?

CSRF is a technique where an attacker tricks a victim into submitting a request to a web application that the victim is already authenticated to. The attacker does this by creating a malicious link or form that, when clicked or submitted, causes the victim's browser to send a request to the target application.

How CSRF Works

CSRF works by exploiting the trust that a web browser has for the target application. When a victim visits a malicious website or opens a malicious email, the attacker's code can create a request to the target application. The browser will automatically include the victim's authentication cookies and send the request to the application.

Types of CSRF Attacks

There are two main types of CSRF attacks:

  • GET Requests: The attacker creates a malicious link that, when clicked, sends a GET request to the target application.
  • POST Requests: The attacker creates a malicious form that, when submitted, sends a POST request to the target application.

Impact of CSRF Attacks

CSRF attacks can have a significant impact on web applications. Attackers can use CSRF to:

  • Steal sensitive information, such as user credentials or financial data
  • Change user settings
  • Perform unauthorized actions, such as making purchases or transferring funds

Preventing CSRF Attacks

There are several techniques that can be used to prevent CSRF attacks:

  • Synchronizer Token Pattern (STP): The application generates a unique token and includes it in all forms and links. The browser will include the token in the request, and the application will verify that the token is valid.
  • Double Submit Cookies (DSC): The application sets an HTTP-only cookie with a unique value. The browser will include the cookie in all requests, and the application will verify that the cookie value is correct.
  • CSRF and HTTP Headers: The application can add additional HTTP headers to requests that are not normally sent by browsers. Attackers cannot forge these headers, which makes it more difficult to perform CSRF attacks.

Next Topic: SQL Injection

In our next session, we'll explore SQL Injection, a technique where attackers exploit vulnerabilities in web applications to execute malicious SQL queries. Follow us to learn more!