How does DOM based XSS work?

How does DOM based XSS 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.

What DOM XSS can do?

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.

How does an XSS attack work?

How does XSS work? Cross-site scripting works by manipulating a vulnerable web site so that it returns malicious JavaScript to users. When the malicious code executes inside a victim's browser, the attacker can fully compromise their interaction with the application.

Is DOM XSS persistent?

Reflected XSS is not a persistent attack, so the attacker needs to deliver the payload to each victim. These attacks are often made using social networks.

Can WAF protect against DOM XSS?

DOM-Based XSS It has been estimated that 30% of XSS attacks on live websites are XSS inside JavaScript code and cannot be blocked by a WAF. Due to the difficulty of discovering them, DOM-based XSS vulnerabilities become a blind spot for many scanning tools and penetration tests.

What is the difference between DOM XSS and reflected XSS?

While DOM-based XSS occurs by processing data from an untrusted source by writing data to a potentially dangerous sink within the DOM, reflected XSS occurs when an application obtains data in an HTTP request and includes that data within the immediate response in an unsafe way.

What does DOM mean programming?

Document Object Model The Document Object Model (DOM) is an application programming interface (API) for HTML and XML documents. It defines the logical structure of documents and the way a document is accessed and manipulated.

What is persistent XSS?

A persistent cross-site scripting (stored XSS) attack is possible when a website or web application stores user input and later serves it to other users. Attackers use vulnerable web pages to inject malicious code and have it stored on the web server for later use.

What is cross site scripting prevention?

• Prevent Cross-Site Scripting ( XSS ) in ASP.NET Core. Cross-Site Scripting (XSS) is a security vulnerability which enables an attacker to place client side scripts (usually JavaScript) into web pages.

What is cross site script?

• Cross-site scripting ( XSS ) is a type of computer security vulnerability typically found in web applications. XSS enables attackers to inject client-side scripts into web pages viewed by other users. A cross-site scripting vulnerability may be used by attackers to bypass access controls such as the same-origin policy.

What is a reflective cross site scripting attack?

• A Reflective cross-site scripting attack is a non- persistent attack in which all input shows output on the user’s/attackers screen and does not modify data stored on the server.

What is persistent XSS?

• XSS Persistent (Stored) The persistent (or stored) XSS vulnerability is a more devastating variant of a cross-site scripting flaw: it occurs when the data provided by the attacker is saved by the server, and then permanently displayed on “normal” pages returned to other users in the course of regular browsing, without proper HTML escaping.