What two things must a web site do to make it vulnerable to an XSS attack?
A web page or web application is vulnerable to XSS if it uses unsanitized user input in the output that it generates. This user input must then be parsed by the victim’s browser. XSS attacks are possible in VBScript, ActiveX, Flash, and even CSS.
What does an XSS attack attempt to exploit?
Cross-site scripting (XSS) is a type of security vulnerability typically found in web applications. XSS attacks enable attackers to inject client-side scripts into web pages viewed by other users. A cross-site scripting vulnerability may be used by attackers to bypass access controls such as the same-origin policy.
How can I exploit cross site scripting ( XSS ) vulnerability?
First, some background, I was testing a site which had a persistent Cross Site Scripting (XSS) vulnerability on the user’s profile page. Whereby the user could alter their own username and perform a XSS on themselves. No other user could view this XSS exploit. Sound a bit difficult to exploit doesn’t it?
Where does a XSS attack take place on a computer?
XSS attacks occur when an attacker uses a web application to send malicious code, generally in the form of a browser side script, to a different end user. Flaws that allow these attacks to succeed are quite widespread and occur anywhere a web application uses input from a user within the output it generates without validating or encoding it.
How does an XSS attack steal your cookies?
This attack will use JavaScript to steal the current users cookies, as well as their session cookie. Let’s break this payload down. It uses a script tag to append an image to the current page. When the browser loads the image, the victim will send his cookies to evildomain where the attacker stores the victims cookies.
Is there a way to exploit CSRF with XSS?
Whereby the user could alter their own username and perform a XSS on themselves. No other user could view this XSS exploit. Sound a bit difficult to exploit doesn’t it? We see this quite commonly, and normally raise it as a risk, occasionally it’s even fixed, but not always, after all, there’s no way of exploiting it.