A simple example of a Cross-site scripting attack [closed]
See http://www.insecurelabs.org and http://www.insecurelabs.org/task/ Intentionally vulnerable to XSS in the search field and several other places.
xss
How does XSS work?
Cross Site Scripting basically is a security vulnerability of dynamic web pages where an attacker can create a malicious link to inject unwanted executable JavaScript into a Web site. The most usual case of this vulnerabilities occurs when GET variables are printed or echoed without filtering or checking their content. When a victim clicks the … Read more
Input sanitization in ReactJS
It’s sanitized by default, you don’t need a sanitization method unless you are using dangerouslySetInnerHTML which is not the case.
How to safely run user-supplied Javascript code inside the browser?
After much consideration and with the help of other posters in this thread (thank you so much for your help!), I found a first bunch of answers to my questions. I am re-writing my answer here though, because it summarizes the concepts and also gives you some actual code to experiment with. Generally, there are … Read more
How to temporarily disable XSS protection in modern browsers for testing?
In Chrome there is a flag with which you can start the browser. If you start the browser with this flag, you can do what you want: –disable-web-security
Java Best Practices to Prevent Cross Site Scripting [closed]
The normal practice is to HTML-escape any user-controlled data during redisplaying in JSP, not during processing the submitted data in servlet nor during storing in DB. In JSP you can use the JSTL (to install it, just drop jstl-1.2.jar in /WEB-INF/lib) <c:out> tag or fn:escapeXml function for this. E.g. <%@ taglib uri=”http://java.sun.com/jsp/jstl/core” prefix=”c” %> … … Read more
Error: Permission denied to access property “document”
Accessing and then modifying webpages in iframes of other websites is known as Cross-site scripting or XSS and it is a technique used by malicious hackers to prey on unsuspecting victims. A policy by the name of “Same-Origin Policy” is implemented by browser makers to prevent such behaviour and arbitrary execution of JS code. This … Read more
Turning an SVG string into an image in a React component
Since the SVG is dynamically generated and you can’t store it as an asset, as an alternative to dangerouslySetInnerHTML, you could simply set it as a Data URI on the image. So something like… class SomeComponent extends React.Component { render() { const image=”<svg xmlns=”http://www.w3.org/2000/svg” version=”1.2″ baseProfile=”tiny” width=”47.4″ height=”40.65″ viewBox=”21 18.5 158 135.5″><path d=”M25,50 l150,0 0,100 … Read more