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How To Deface Website With Cross Site Scripting : Complete XSS Tutorial

On the other hand, reflected or non-persistent cross-site scripting involves the immediate return of user input. To exploit a reflective XSS, an attacker must trick the user into sending data to the target site, which is often done by tricking the user into clicking a maliciously crafted link. In many cases, reflective XSS attacks rely on phishing emails or shortened or otherwise obscured URLs sent to the targeted user. When the victim visits the link, the script automatically executes in their browser.

How To Deface Website With Cross Site Scripting : Complete XSS Tutorial

DOM-based cross-site scripting, also called client-side XSS, has some similarity to reflected XSS as it is often delivered through a malicious URL that contains a damaging script. However, rather than including the payload in the HTTP response of a trusted site, the attack is executed entirely in the browser by modifying the DOM or Document Object Model. This targets the failure of legitimate JavaScript already on the page to properly sanitize user input.

To understand what happened with the chat application, we need to take a quick detour and explain how the browser executes HTML and JavaScript. Each time you visit a website, your browser downloads HTML, CSS, and JavaScript from the server that hosts the website. The browser interprets and displays HTML and CSS and executes JavaScript.

1. You can use the PHP file I already put on for you test it on your own lab(use XAMPP), but for this tutorial I will use from real website on the wild internet (do not worry, the logic was the same, once you understand it you'll got the point)

5. Now we got the vulnerable website what to do next?? Did you know that with Cross Site Scripting (XSS) you also can do a defacing to a website by injecting some code in it?(not really deface/fake)

The XSS attacks, CSS (Cross Site Scripting) not to be confused with CSS style sheets (Cascading Style Sheet), is a type of website security vulnerbility, which is found in the poorly secured web applications.

The principle of WordPress XSS Attack is to inject malicious code in scripting language into a vulnerable website, for example by posting a message in a forum that redirects the user to a fake site ( phishing ) or stealing information (cookies ).

The XSS cross site scripting attack allows to execute scripts on the client side. This means that you can only run JAVASCRIPT, HTML and other languages that will only run in the one who starts the script and not on the server directly, I let your imagination give you ideas.

If a website is the victim of such attacks, malicious content and server crashes are the cause of the loss of user visits. In the long run, the search engines react with penalties and Internet users with mistrust, which ultimately leads to economic losses. For all this, administrators and users should use all means to avoid and prevent XSS in WordPress.

When referring to XSS, the Domain of a website is roughly equivalent to the resources associated with that website on the client-side of the connection. That is, the domain can be thought of as all resources the browser is storing for the user's interactions with this particular site.

Cross-site scripting can be used to deface a website. The attacker can use injected scripts to alter the website's content or even redirect the browser to another website, such as one that includes malicious code.

Reflected or non-persistent cross-site scripting, on the other hand, entails the immediate return of user input. An attacker must mislead the user into transferring data to the target site to exploit a reflected XSS, which is generally done by deceiving the user into clicking a maliciously designed link.

DOM-based cross-site scripting, also known as client-side XSS, is similar to reflected XSS in that it is frequently provided via a rogue URL containing a harmful script. The attack is carried out entirely within the browser rather than including the payload in a trusted site's HTTP response by changing the DOM (Document Object Model). This is aimed at legal JavaScript already on the page and fails to sanitize user input properly.

Cross-site scripting can have a significant impact on a whole company. If an e-commerce website is discovered to be the source of an XSS attack, it might harm the company's reputation and customer trust.

With so many different types of cross-site scripting assaults, businesses need to know how to protect themselves and avoid future difficulties. Due to their increasing complexity, websites are becoming more challenging to monitor than ever before strictly. As time goes on, the frequency of attacks is likely to increase.

Cross-site scripting, often abbreviated as XSS, is a type of attack in which malicious scripts are injected into websites and web applications for the purpose of running on the end user's device. During this process, unsanitized or unvalidated inputs (user-entered data) are used to change outputs.

XSSI vulnerabilities take advantage of the same-origin policy, which determines whether documents, resources, and scripts located on different sources can interact with each other. This policy does not at all limit the use of scripts; an attacker's webpage can be linked to a script on the victim's website. In this case, there is a possibility that this script is generated dynamically and stores critical information. When a user accesses the attacker's site, this information becomes available to the attacker.

In this tutorial you will learn how to hack websites, and we will introduce you to web application hacking techniques and the counter measures you can put in place to protect against such attacks.

In this website hacking practical scenario, we are going to hijack the user session of the web application located at We will use cross site scripting to read the cookie session id then use it to impersonate a legitimate user session.

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The cross-site scripting attack is an attack on web applications that allow a hacker to inject malicious scripts to perform malicious actions. The malicious script is executed on the browser side, which makes this attack very powerful and critical.

Basically, cross site scripting is a type of security hole in a website's forms. Normally forms allow you to input information to generate a specific page based on what you entered. In the specific page however if the text you put into the form in displayed, then people like us are able to manipulate the surrounding html tags to our liking by inputing specific code.

If you don't already have a website in mind that you want to test then here is howto find them easily. You can simply use Google Dorks! What we want to look for is a search page and it would be great if that search page ended in "search.php?=". The main reason we want a search page is because they are more likely to have a message that displayed with the form content when there is no match found. I will simply google "inurl:search.php?="

Now you may be asking yourself, "How do I test for XSS," Well I'll tell you. Most internet browsers have a built in feature that allows you to look at the html in the website you are viewing. We will be taking advantage of that along with our mediocre html skills. First, before we began with our shenanigans we must find out how our site outputs the form information. To do this I will lookup "nullbyte" on our site's search bar.

The first thing that I notice is that there are not quotation marks around the word "nullbyte". This is a really good sign for us because it means that the site is most likely vulnerable. The second thing I notice, and this is really important, is that the tags surrounding the text are tags. Before we start inserting our own html we need to know some really basic concepts of html. Firstly, every tag that is open has to be closed eventually. Secondly, all other information is between tags. Now that we know this we will finally be able to finally find out if this website can be cross site scripted.

Sucess we have successfully injected our own tag an now the website has some memes on it. Now this will only display if someone goes to our custom ling which my this point looks like a mutated cucumber: but normally users don't really care about the rest as long as looks legit. Now if you aren't satisfied enough with your new found ability to insert memes into broken websites then maybe a little malicious javascript could satisfy your needs. But that's for a whole different tutorial. I hope you enjoyed and see you guys in the next tutorial... maybe...

Cross-site scripting vulnerabilities allow foreign JavaScript code to be carried out on a website. This can be very difficult for WordPress site owners to catch because the attacks that exploit the vulnerability can be a number of different types.

The best way to detect XSS attacks is to use a plugin such as iThemes Security Pro iThemes Security Pro has several website security features to build your frontline of defense against cross-site scripting attacks. (more on that in a bit).


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