12. Web Exploit : XSS Injection

Summary

This video delves into **SSS Injection**, a web exploitation technique that targets JavaScript-based vulnerabilities, similar to SQL injection. The process involves identifying vulnerable URLs, analyzing parameters, and testing them with custom script injections. The speaker demonstrates these steps using practical tools like Delphi SSS Scanner, Cheat Seat, and Intruder. By injecting payloads into fields such as currency management, the speaker highlights the importance of input validation to prevent unauthorized code execution. The video serves as both an introduction to **SSS Injection** and a hands-on guide for web security enthusiasts.

Takeaways

• 😀 SSS injection (likely Cross-Site Scripting) is similar to SQL injection but involves injecting JavaScript into web applications.
• 😀 The first step in exploiting SSS injection is to identify vulnerable parameters in the URL or input fields of a website.
• 😀 After identifying a vulnerable parameter, analyze how the website responds to the input to understand its behavior and potential for exploitation.
• 😀 Testing the parameter involves injecting payloads like JavaScript code (e.g., alert()) to see if they are executed by the website.
• 😀 Sometimes, encoding the payload (e.g., URL encoding) is necessary to bypass defenses against malicious input.
• 😀 A key aspect of SSS exploitation is understanding how to insert malicious scripts into parameters, such as adding tags or using event handlers.
• 😀 Tools like Burp Suite and other SSS scanners are helpful for identifying vulnerabilities and automating the exploitation process.
• 😀 Cross-Site Scripting (XSS) attacks can be tested using a browser's developer tools, such as in Firefox, to analyze the effect of injected payloads.
• 😀 It's crucial to test different variations of the injected payloads to ensure they work across different parts of the website.
• 😀 The video emphasizes the importance of custom testing and analysis when default tools or scripts fail to exploit certain vulnerabilities.

Q & A

What is the main topic of the video?

The video discusses web exploitation, specifically focusing on SSS (Script-based SQL injection) and how it differs from traditional SQL injection attacks.

How does SSS injection differ from SQL injection?

SSS injection involves injecting JavaScript into web parameters, whereas SQL injection targets the database using SQL commands. Both attacks involve manipulating input data, but they operate in different contexts (JavaScript vs SQL).

What is the general approach for performing an SSS injection attack?

The approach for SSS injection includes identifying the URL, analyzing the parameters, checking the response, and then attempting to inject JavaScript into the parameters to see if it executes within the web page.

What tools are used to perform an SSS injection attack?

Tools like the Firefox browser, proxy tools, and cheat sheets (such as the one from Swinger) are commonly used for SSS injection, along with the Intruder tool in some security testing software.

Why does the presenter mention creating custom pilots for SSS injection?

Custom pilots are necessary because pre-made scripts or tools may not work if the system has been updated or secured, requiring testers to create unique scripts tailored to the specific web application.

What does the presenter demonstrate when interacting with the 'currency' function?

The presenter demonstrates adding a currency to a dashboard and attempting to inject JavaScript into the input field, which is used to test if the site is vulnerable to SSS injection.

What happens when the presenter tries to inject JavaScript into the currency input field?

Initially, the injected JavaScript doesn't appear to work, but after some adjustments, including ensuring the session is active and the input fields are correctly processed, the JavaScript executes and the injected code appears in the currency list.

What role does the 'header' and 'td' tags play in SSS injection?

In the context of SSS injection, understanding and manipulating the 'header' and 'td' tags is crucial for injecting JavaScript properly, ensuring it executes in the right location and context within the web page.

What is the significance of using event handlers in SSS injection?

Event handlers in SSS injection are important because they determine how injected scripts will be triggered, allowing the attacker to control when and how the script runs within the web page, such as on page load or when an element is clicked.

Why is it necessary to use tools like Intruder in SSS injection testing?

Intruder is used to automate the injection process by sending multiple variations of input data and scripts to test the application's response to different payloads. It helps in identifying vulnerabilities more efficiently by automating the attack scenarios.