Hi everyone,
In this article, I want to talk about Cross-site scripting attacks. This attack is ranked 7 in the OWASP top ten and it's define as such.
A7: Cross-site scripting (XSS)
XSS happens when the user can send untrustred data to the web application without the page validating the data or escaping unsafe characters.
When a website doesn't validate or filters the data you send, you can execute JavaScript code in the victim's browser. The risks are that you can steal cookies, deface a web site, take control of an account and even spread a worm (famous Samy's worm that exploited Myspace https://samy.pl/myspace/).
XSS is mostly define as three types.
Reflected XSS
The malicious code is executed and sent back to the user with an URL or a search bar for example.
Stored XSS
The malicious code is injected on the website in a comment box or username field for example. Every time a user go and see the malicious comment, the code is executed.
DOM XSS
This time, the malicious code is interpreted by the DOM environment.
This is a brief overview of XSS as this subject can go very large. In the next article I will show you how to set-up the environment to test and learn about XSS.
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