The difference between php csrf attack and xss attack

The basic concept, abbreviation, and full name of CSRF

CSRF (Cross-site request forgery): Cross-site request forgery. (Recommended learning: PHP video tutorial)

PS: Be sure to remember the Chinese name. The full English name, if you can’t remember it, forget it.

CSRF attack principle

The user is a registered user of website A and logs in, so website A issues a cookie to the user.

As can be seen from the above figure, to complete a CSRF attack, the victim must meet two necessary conditions:

(1) Login is trusted Website A, and generate cookies locally. (If the user is not logged in to website A, then website B will prompt you to log in when requesting the API interface of website A during induction)

(2) Visit dangerous websites without logging out of A B (actually exploiting the vulnerability of website A).

When we talk about CSRF, we must make the above two points clear.

As a reminder, cookies ensure that users can be logged in, but website B cannot actually get cookies.

Basic concepts of XSS

XSS (Cross Site Scripting): Cross-domain scripting attack.

XSS attack principle

The core principle of XSS attack is: you do not need to do any login authentication, it will pass legal operations (such as entering in the url , enter in the comment box), inject scripts (maybe js, hmtl code blocks, etc.) into your page.

The final result may be:

Stealing cookies to destroy the normal structure of the page, inserting advertisements and other malicious content D-doss attacks

## The difference between #CSRF and XSS

Difference 1:

CSRF: The user needs to log in to website A first to obtain the cookie. XSS: No login required.

Difference 2: (Difference in principle)

CSRF: It uses the vulnerability of website A itself to request the API of website A. XSS: Injects JS code into website A, and then executes the code in JS to tamper with the content of website A.

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