Injection Cross Site Scripting (XSS) - Ravi-Upadhyay/cyber-security-playground GitHub Wiki

• Explanation
• Risk Matrix
• Exploitations
• Fixes
  • Code Snippets
• Resources Over Web
• To do list

Cross-Site Scripting (XSS) is a type of security vulnerability typically found in web applications. XSS attacks enable attackers to inject client-side scripts into web pages viewed by other users. This can lead to unauthorized actions, data theft, and other malicious activities.

1. Stored XSS: Malicious script is stored on the target server, such as in a database, comment field, or message forum.
2. Reflected XSS: Malicious script is reflected off a web server, such as in an error message, search result, or any other response that includes some or all of the input sent to the server.
3. DOM-based XSS: The vulnerability exists in client-side code rather than server-side code.

1. Impact: High - Can lead to data theft, session hijacking, and unauthorized actions.
2. Likelihood: Medium - Common in web applications with insufficient input validation.
3. Detection: Medium - Can be detected using automated tools and manual code reviews.
4. Mitigation: High - Can be mitigated with proper input validation and output encoding.

1. Stored XSS: Malicious script is stored on the target server, such as in a database, comment field, or message forum.
2. Reflected XSS: Malicious script is reflected off a web server, such as in an error message, search result, or any other response that includes some or all of the input sent to the server.
3. DOM-based XSS: The vulnerability exists in client-side code rather than server-side code.

1. Input Validation: Ensure that all user inputs are validated and sanitized.
2. Output Encoding: Encode data before rendering it on the web page.
3. Content Security Policy (CSP): Implement CSP to restrict the sources from which scripts can be loaded.
4. Use Security Libraries: Utilize libraries and frameworks that automatically handle XSS protection.

// Example of output encoding in Java using OWASP Java Encoder
import org.owasp.encoder.Encode;

public class XSSProtection {
    public static void main(String[] args) {
        String userInput = "<script>alert('XSS');</script>";
        String safeOutput = Encode.forHtml(userInput);
        System.out.println(safeOutput); // &lt;script&gt;alert(&#39;XSS&#39;);&lt;/script&gt;
    }
}

• OWASP XSS Prevention Cheat Sheet
• Mozilla Developer Network (MDN) - Cross-Site Scripting (XSS)
• Google - Cross-Site Scripting (XSS) Prevention

1. Add more detailed examples of XSS attacks.
2. Include case studies of real-world XSS vulnerabilities.
3. Provide additional code snippets for different programming languages.
4. Update the risk matrix with more detailed analysis.
5. Gather more resources and references for further reading.