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What is the difference between DOM based 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 is Dom purify?
DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. It’s written in JаvaScript and works in all modern browsers (Safari, Opera (15+), Internet Explorer (9+), Firefox and Chrome – as well as almost anything else using Blink or WebKit).
How are DOM based XSS vulnerabilities affect JavaScript?
DOM-based XSS vulnerabilities usually arise when JavaScript takes data from an attacker-controllable source, such as the URL, and passes it to a sink that supports dynamic code execution, such as eval () or innerHTML. This enables attackers to execute malicious JavaScript, which typically allows them to hijack other users’ accounts.
How to deliver a DOM based XSS attack?
To deliver a DOM-based XSS attack, you need to place data into a source so that it is propagated to a sink and causes execution of arbitrary JavaScript. The most common source for DOM XSS is the URL, which is typically accessed with the window.location object.
How does DOM based cross-site scripting attack work?
In reflective and stored Cross-site scripting attacks you can see the vulnerability payload in the response page but in DOM based cross-site scripting, the HTML source code and response of the attack will be exactly the same, i.e. the payload cannot be found in the response.
How are websites vulnerable to cross site scripting?
After the malicious code is executed by page, you can simply exploit this DOM based cross-site scripting vulnerability to steal the cookies from the user’s browser or change the behaviour of the page on the web application as you like. Various research and studies identified that up to 50% of websites are vulnerable to DOM Based XSS vulnerability.