What is DOM based XSS example?

DOM Based XSS (or as it is called in some texts, “type-0 XSS”) is an XSS attack wherein the attack payload is executed as a result of modifying the DOM “environment” in the victim’s browser used by the original client side script, so that the client side code runs in an “unexpected” manner.

What is DOM based XSS attack?

DOM XSS stands for Document Object Model-based Cross-site Scripting. A DOM-based XSS attack is possible if the web application writes data to the Document Object Model without proper sanitization. The attacker can manipulate this data to include XSS content on the web page, for example, malicious JavaScript code.

What security control should be used to prevent DOM XSS?

The primary rule that you must follow to prevent DOM XSS is: sanitize all untrusted data, even if it is only used in client-side scripts. If you have to use user input on your page, always use it in the text context, never as HTML tags or any other potential code.

What are DOM based vulnerabilities?

What is the DOM? DOM-based vulnerabilities arise when a website contains JavaScript that takes an attacker-controllable value, known as a source, and passes it into a dangerous function, known as a sink.

How does a DOM based XSS attack work?

DOM Based XSS (or as it is called in some texts, “type-0 XSS”) is an XSS attack wherein the attack payload is executed as a result of modifying the DOM “environment” in the victim’s browser used by the original client side script, so that the client side code runs in an “unexpected” manner. That is, the page itself (the HTTP response that is)

How to prevent DOM-based cross-site scripting ( XSS )?

DOM-based cross-site scripting (DOM XSS) is a web vulnerability, a subtype of cross-site scripting. An attacker can execute a DOM-based cross-site scripting attack if the web application writes user-supplied information directly to the Document Object Model (DOM) and there is no sanitization.

What does Dom XSS stand for in JavaScript?

DOM XSS stands for Document Object Model-based Cross-site Scripting. This kind of XSS attack occurs when an application receives some client-side JavaScript that processes data from an unsafe, or untrusted source by writing the data to a potentially dangerous sink within the DOM instead of writing data in HTML which would present a regular XSS.

Can a client side code enable a XSS attack?

Consequently, even with completely secure server-side code, the client-side code might still unsafely include user input in a DOM update after the page has loaded. If this happens, the client-side code has enabled an XSS attack through no fault of the server-side code.