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
As the answers on how XSS can be malicious are already given, I’ll only answer the following question left unanswered: how can i prevent XSS from happening on my websites ? As to preventing from XSS, you need to HTML-escape any user-controlled input when they’re about to be redisplayed on the page. This includes request … Read more
The dot.net core community has a wiki on this. You can inject encoders at a controller level (in the constructor) or reference System.Text.Encodings.Web. More info can be seen here: https://learn.microsoft.com/en-us/aspnet/core/security/cross-site-scripting
Unfortunately, almost no one of the participants ever clearly understands what are they talking about. Literally. Only Kibbee managed to make it straight. This topic is all about sanitization. But the truth is, such a thing like wide-termed “general purpose sanitization” everyone is so eager to talk about is just doesn’t exist. There are a … Read more
For people who still want an even more permissive posts, because the other answers were just not permissive enough, and they must work with google chrome for which * is just not enough: default-src * data: blob: filesystem: about: ws: wss: ‘unsafe-inline’ ‘unsafe-eval’ ‘unsafe-dynamic’; script-src * data: blob: ‘unsafe-inline’ ‘unsafe-eval’; connect-src * data: blob: ‘unsafe-inline’; … Read more
For PHP’s own session cookies on Apache: add this to your Apache configuration or .htaccess <IfModule php5_module> php_flag session.cookie_httponly on </IfModule> This can also be set within a script, as long as it is called before session_start(). ini_set( ‘session.cookie_httponly’, 1 );
To prevent from XSS attacks, you just have to check and validate properly all user inputted data that you plan on using and dont allow html or javascript code to be inserted from that form. Or you can you Use htmlspecialchars() to convert HTML characters into HTML entities. So characters like <> that mark the … Read more
First of all, the textattribute of the HTMLScriptElement is the preferred method to access the text of an inline <script> element. DOM-Level-2 and HTML5: 4.11.1 both indicate that a script should have an attribute text which contains the scripts interior text: The IDL attribute text must return a concatenation of the contents of all the … Read more
X-XSS-Protection is a HTTP header understood by Internet Explorer 8 (and newer versions). This header lets domains toggle on and off the “XSS Filter” of IE8, which prevents some categories of XSS attacks. IE8 has the filter activated by default, but servers can switch if off by setting X-XSS-Protection: 0 See also http://blogs.msdn.com/b/ieinternals/archive/2011/01/31/controlling-the-internet-explorer-xss-filter-with-the-x-xss-protection-http-header.aspx
ReactJS is quite safe by design since String variables in views are escaped automatically With JSX you pass a function as the event handler, rather than a string that can contain malicious code so a typical attack like this will not work const username = “<img onerror=”alert(\”Hacked!\”)” src=”https://stackoverflow.com/questions/33644499/invalid-image” />”; class UserProfilePage extends React.Component { render() … Read more