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A Detailed Guide On HTML Parsing and DOMPurify Bypassing for Security Researchers
- The article provides a detailed guide on HTML parsing and bypassing the DOMPurify library for security researchers.
- DOMPurify is a JavaScript package that helps prevent XSS attacks by sanitizing user-generated content.
- DOMPurify removes potentially dangerous elements, attributes, and scripts while maintaining the HTML's visual organisation and structure.
- To install the library DOMPurify, use npm commands.
- Client-side HTML sanitisers, such as DOMPurify, js-sanitize, and sanitize-html, lessen the possibility of cross-site scripting (XSS) attacks.
- The article also explains the working of DOMPurify and the Node flattening concept.
- HTML parsing involves splitting the HTML document into a document object model (DOM) or a parse tree.
- The article provides a list of discovered mutation techniques and the handling of HTML parse states.
- Four DOMPurify bypasses have been discussed in the article, and the unpredictability of HTML was highlighted.
- The article concludes that a single regular expression is now mostly responsible for the security of the DOMPurify library.
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