OWASP Top 5 Vulnerability Explanation with implementation | Learn Ethical Hacking

DOS(Denial Of Service) Attack via Long Password:

A denial-of-service (DoS) attack via a long password is a type of application-layer attack that exploits a vulnerability in a web application's password hashing algorithm. By sending a very long password to the application, the attacker can cause the server to consume excessive CPU and memory resources, leading to a denial of service for legitimate users.

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Cross-Site Script (XSS):

Cross-site scripting (XSS) is a type of web security vulnerability that allows an attacker to inject malicious code into a web page viewed by another user. This code can then be executed by the victim's browser, allowing the attacker to steal sensitive information, such as cookies or session tokens, or to take control of the victim's browser.

There are three main types of XSS attacks:

1. Reflected XSS: This type of attack occurs when the attacker injects malicious code into a web request, such as a form submission or a search query. The web application then returns the malicious code to the user in the response.

2. Stored XSS: This type of attack occurs when the attacker injects malicious code into a web application's persistent data store, such as a database. The malicious code is then stored in the data store and is executed whenever the data is retrieved and displayed to a user.

3. DOM-based XSS: This type of attack occurs when the attacker injects malicious code into a web page's Document Object Model (DOM). The malicious code is then executed by the victim's browser when the DOM is loaded.

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Client-Side Validation:

A client-side validation bypass vulnerability is a type of vulnerability that allows an attacker to bypass the client-side validation checks on a web application. This can allow the attacker to submit malicious data to the web application.

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Open Directory Vulnerability:

An open directory vulnerability is a type of web security vulnerability that occurs when a web server allows users to access files and directories that are not intended to be publicly accessible. This can allow attackers to view sensitive data, such as configuration files or source code, or even to upload malicious files to the server.

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Insecure Direct Object Reference:

Insecure Direct Object Reference (IDOR) is a type of access control vulnerability that occurs when an application allows users to directly access objects without properly checking their permissions. This can allow attackers to access sensitive data or perform unauthorized actions, even if they are not authenticated.

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