Welcome to Cycubix Docs
  • Welcome to Cycubix Docs
  • Our Cybersecurity Training Courses
  • Application Security Series
    • Web Application Security Essentials
      • Introduction | Web Application Security Essentials | Cycubix Docs
      • WebGoat | Web Application Security Essentials | Cycubix Docs
        • WebGoat Installation | Web Application Security | Cycubix Docs
          • Stand-alone
          • Docker
        • WebGoat & WebWolf Run | Web Application Security | Cycubix Docs
        • WebGoat Configuration | Web Application Security | Cycubix Docs
        • WebWolf | Web Application Security | Cycubix Docs
          • Webwolf Upload | WebWolf | Web Application Security | Cycubix
          • Webwolf Mail | WebWolf | Web Application Security | Cycubix
          • WebWolf Landing Page | Web Application Security | Cycubix Docs
        • WebGoat & WebWolf System Requirements | Cycubix Docs
      • ZAP | Web Application Security Essentials | Cycubix Docs
        • ZAP | Download & Installation | Cycubix Docs
        • ZAP | Persist ZAP Session | Cycubix Docs
        • ZAP | ZAP Proxy | Cycubix Docs
      • WebGoat Labs | Web Application Security Essentials | Cycubix Docs
        • General | HTTP Basics | Cycubix Docs
          • General | HTTP Basics (1) | Cycubix Docs
          • General | HTTP Basics (2) | Cycubix Docs
          • General | HTTP Basics (3) | Cycubix Docs
        • General | HTTP Proxies | Cycubix Docs
          • General | HTTP Proxies (1) | Cycubix Docs
          • General | HTTP Proxies (2) | Cycubix Docs
          • General | HTTP Proxies (3) | Cycubix Docs
          • General | HTTP Proxies (4) | Cycubix Docs
          • General | HTTP Proxies (5) | Cycubix Docs
          • General | HTTP Proxies (6) | Cycubix Docs
          • General | HTTP Proxies (7) | Cycubix Docs
          • General | HTTP Proxies (8) | Cycubix Docs
          • General | HTTP Proxies (9) | Cycubix Docs
        • General | Developer Tools | Cycubix Docs
          • General | Developer Tools (1) | Cycubix Docs
          • General | Developer Tools (2) | Cycubix Docs
          • General | Developer Tools (3) | Cycubix Docs
          • General | Developer Tools (4) | Cycubix Docs
          • General | Developer Tools (5) | Cycubix Docs
          • General | Developer Tools (6) | Cycubix Docs
        • General | The CIA Triad | Cycubix Docs
          • General | The CIA Triad (1) | Cycubix Docs
          • General | The CIA Triad (2) | Cycubix Docs
          • General | The CIA Triad (3) | Cycubix Docs
          • General | The CIA Triad (4) | Cycubix Docs
          • General | The CIA Triad (5) | Cycubix Docs
        • A1:2021 | Broken Access Control | Cycubix Docs
          • A1:2021 | Hijack a Session | Cycubix Docs
            • A1:2021 | Hijack a Session (1) | Cycubix Docs
            • A1:2021 | Hijack a Session (2) | Cycubix Docs
          • A1:2021 | Insecure Direct Object Reference | Cycubix Docs
            • A1:2021 | Insecure Direct Object Reference (1) | Cycubix Docs
            • A1:2021 | Insecure Direct Object Reference (2) | Cycubix Docs
            • A1:2021 | Insecure Direct Object Reference (3) | Cycubix Docs
            • A1:2021 | Insecure Direct Object Reference (4) | Cycubix Docs
            • A1:2021 | Insecure Direct Object Reference (5) | Cycubix Docs
            • A1:2021 | Insecure Direct Object Reference (6) | Cycubix Docs
          • A1:2021 | Missing Function Level Access Control | Cycubix Docs
            • A1:2021 | Missing Function Level Access Control (1) | Cycubix Docs
            • A1:2021 | Missing Function Level Access Control (2) | Cycubix Docs
            • A1:2021 | Missing Function Level Access Control (3) | Cycubix Docs
            • A1:2021 | Missing Function Level Access Control (4) | Cycubix Docs
          • A1:2021 | Spoofing an Authentication Cookie | Cycubix Docs
            • A1:2021 | Spoofing an Authentication Cookie (1) | Cycubix Docs
            • A1:2021 | Spoofing an Authentication Cookie (2) | Cycubix Docs
        • A2:2021 | Cryptographic Failures | Cycubix Docs
          • A2:2021 | Crypto Basics (1) | Cycubix Docs
          • A2:2021 | Crypto Basics (2) | Cycubix Docs
          • A2:2021 | Crypto Basics (3) | Cycubix Docs
          • A2:2021 | Crypto Basics (4) | Cycubics Docs
          • A2:2021 | Crypto Basics (5) | Cycubix Docs
          • A2:2021 | Crypto Basics (6) | Cycubix Docs
          • A2:2021 | Crypto Basics (7) | Cycubix Docs
          • A2:2021 | Crypto Basics (8) | Cycubix Docs
          • A2:2021 | Crypto Basics (9) | Cycubix Docs
        • A3:2021 | Injection | Cycubix Docs
          • A3:2021 | SQL Injection Intro | Cycubix Docs
            • A3:2021 | SQL Injection Intro (1) | Cycubix Docs
            • A3:2021 | SQL Injection Intro (2) | Cycubix Docs
            • A3:2021 | SQL Injection Intro (3) | Cycubix Docs
            • A3:2021 | SQL injection Intro (4) | Cycubix Docs
            • A3:2021 | SQL Injection Intro (5) | Cycubix Docs
            • A3:2021 | SQL Injection Intro (6) | Cycubix Docs
            • A3:2021 | SQL Injection Intro (7) | Cycubix Docs
            • A3:2021 | SQL Injection Intro (8) | Cycubix Docs
            • A3:2021 | SQL Injection Intro (9) | Cycubix Docs
            • A3:2021 | SQL Injection Intro (10) | Cycubix Docs
            • A3:2021 | SQL Injection Intro (11) | Cycubix Docs
            • A3:2021 | SQL Injection Intro (12) | Cycubix Docs
            • A3:2021 | SQL Injection Intro (13) | Cycubix Docs
          • A3:2021 | SQL Injection Advanced | Cycubix Docs
            • A3:2021 | SQL Injection Advanced (1) | Cycubix Docs
            • A3:2021 | SQL Injection Advanced (2) | Cycubix Docs
            • A3:2021 | SQL Injection Advanced (3) | Cycubix Docs
            • A3:2021 | SQL Injection Advanced (4) | Cycubix Docs
            • A3:2021 |SQL Injection Advanced (5) | Cycubix Docs
            • A3:2021 | SQL Injection Advanced (6)| Cycubix Docs
          • A3:2021 | Injection | SQL Injection Mitigation | Cycubix Docs
            • A3:2021 | SQL Injection Mitigation (1) | Cycubics Docs
            • A3:2021 | SQL Injection Mitigation (2) |
            • A3:2021 | SQL Injection Mitigation (3) | Cycubix Docs
            • A3:2021 | SQL Injection Mitigation (4) | Cycubix Docs
            • A3:2021 | SQL injection Mitigation (5) | Cycubix Docs
            • A3:2021 | SQL Injection Mitigation (6) | Cycubix Docs
            • A3:2021 | SQL Injection Mitigation (7) | Cycubix Docs
            • A3:2021 | SQL Injection Mitigation (8) | Cycubix Docs
            • A3:2021 | SQL Injection Mitigation (9) | Cycubix Docs
            • A3:2021 | SQL Injection Mitigation (10) | Cycubix Docs
            • A3:2021 | SQL Injection Mitigation (11) | Cycubix Docs
            • A3:2021 | SQL Injection Mitigation (12) | Cycubix Docs
            • A3:2021 | SQL Injection Mitigation (13) | Cycubix Docs
          • A3:2021 | Cross-Site Scripting (XSS) | Cycubix Docs
            • A3:2021 | Cross Site Scripting XXS (1) | Cycubix Docs
            • A3:2021 | Cross Site Scripting (XSS) (2) | Cycubix Docs
            • A3:2021 | Cross Site Scripting (XSS) (3) | Cycubix Docs
            • A3:2021 | Cross Site Scripting (XSS) (4) | Cycubix Docs
            • A3:2021 | Cross Site Scripting (XSS) (5) | Cycubix Docs
            • A3:2021 | Cross Site Scripting (XSS) (6) | Cycubix Docs
            • A3:2021 | Cross Site Scripting (XSS) (7) | Cycubix Docs
            • A3:2021 | Cross Site Scripting (XSS) (8) | Cycubix Docs
            • A3:2021 | Cross Site Scripting (XSS) (9) | Cycubix Docs
            • A3:2021 | Cross Site Scripting (XSS) (10) | Cycubix Docs
            • A3:2021 | Cross Site Scripting (XSS) (11) | Cycubix Docs
            • A3:2021 | Cross Site Scripting (XSS) (12) | Cycubix Docs
          • A3:2021 | Cross Site Scripting Stored | Cycubix Docs
            • A3:2021 | Cross Site Scripting Stored (1) | Cycubix Docs
            • A3:2021 | Cross Site Scripting Stored (2)
            • A3:2021 | Cross Site Scripting Stored (3) | Cycubix Docs
          • A3:2021 | Cross Site Scripting Mitigation | Cycubix Docs
            • A3:2021 | Cross Site Scripting Mitigation (1) | Cycubix Docs
            • A3:2021 | Cross Site Scripting Mitigation (2) | Cycubix Docs
            • A3:2021 | Cross Site Scripting Mitigation (3) | Cycubix Docs
            • A3:2021 | Cross Site Scripting Mitigation (4) | Cycubix Docs
            • A3:2021 | Cross Site Scripting Mitigation (5) | Cycubix Docs
            • A3:2021 | Cross Site Scripting Mitigation (6) |
          • A3:2021 | Path Transversal | Cycubix Docs
            • A3: 2021 | Path Transversal (1) | Cycubix Docs
            • A3:2021 | Path Transversal (2) | Cycubix Docs
            • A3:2021 | Path Transversal (3) | Cycubix Docs
            • A3:2021 | Path Transversal (4) | Cycubix Docs
            • A3:2021 | Path Transversal (5) | Cycubix Docs
            • A3:2023 | Path Transversal (6) | Cycubix Docs
            • A3:2021 | Path Transversal (7) | Cycubix Docs
            • A3:2021 | Path Transversal (8) | Cycubix Docs
        • A5:2021 | Security Misconfiguration | Cycubix Docs
          • A5:2021 | Security Misconfiguration (1) | Cycubix Docs
          • A5:2021 | Security Misconfiguration (2) | Cycubix Docs
          • A5:2021 | Security Misconfiguration (3) | Cycubix Docs
          • A5:2021 | Security Misconfiguration (4) | Cycubix Docs
          • A5:2021 | Security Misconfiguration (5) | Cycubix Docs
          • A5:2021 | Security Misconfiguration (6) | Cycubix Docs
          • A5:2021 | Security Misconfiguration (7) | Cycubix Docs
          • A5:2021 | Security Misconfiguration (8) | Cycubix Docs
          • A5:2021 | Security Misconfiguration (9) | Cycubix Docs
          • A5:2021 | Security Misconfiguration (10) | Cycubix Docs
          • A5:2021 | Security Misconfiguration (11) | Cycubix Docs
          • A5:2021 | Security Misconfiguration (12) | Cycubix Docs
          • A5:2021 | Security Misconfiguration (13) | Cycubix Docs
        • A6:2021 | Vulnerable and Outdated Components | Cycubix Docs
          • A6:2021 | Vulnerable and Outdated Components (1) | Cycubix Docs
          • A6:2021 | Vulnerable and Outdated Components (2) | Cycubix Docs
          • A6:2021 | Vulnerable and Outdated Components (3) | Cycubix Docs
          • A6:2021 | Vulnerable and Outdated Components (4) | Cycubix Docs
          • A6:2021 | Vulnerable and Outdated Components (5) | Cycubix Docs
          • A6:2021 | Vulnerable and Outdated Components (6) | Cycubix Docs
          • A6:2021 | Vulnerable and Outdated Components (7) | Cycubix Docs
          • A6:2021 | Vulnerable and Outdated Components (8) | Cycubix Docs
          • A6:2021 | Vulnerable and Outdated Components (9) | Cycubix Docs
          • A6:2021 | Vulnerable and Outdated Components (10) | Cycubix Docs
          • A6:2021 | Vulnerable and Outdated Components (11) | Cycubix Docs
          • A6:2021 | Vulnerable and Outdated Components (12) | Cycubix Docs
          • A6:2021 | Vulnerable and Outdated Components (13) | Cycubix Docs
        • A7:2021 | Identity and Authentication Failure | Cycubix Docs
          • A7:2021 | Authentication Bypasses | Cycubix Docs
            • A7:2021 | Authentication Bypasses (1) | Cycubix Docs
            • A7:2021 | Authentication Bypasses (2) | Cycubix Docs
          • A7:2021 | Insecure Login | Cycubix Docs
            • A7:2021 | Insecure Login (1) | Cycubix Docs
            • A7:2021 | Insecure Login (2) | Cycubix Docs
          • A7: 2021 | JWT Tokens | Cycubix Docs
            • A7: 2021 | JWT Tokens (1) | Cycubix Docs
            • A7: 2021 | JWT Tokens (2) | Cycubix Docs
            • A7: 2021 | JWT Tokens (3) | Cycubix Docs
            • A7: 2021 | JWT Tokens (4) | Cycubix Docs
            • A7: 2021 | JWT Tokens (5) | Cycubix Docs
            • A7: 2021 | JWT Tokens (6) | Cycubix Docs
            • A7: 2021 | JWT Tokens (7) | Cycubix Docs
            • A7: 2021 | JWT Tokens (8) | Cycubix Docs
            • A7: 2021 | JWT Tokens (9) | Cycubix Docs
            • A7: 2021 | JWT Tokens (10) | Cycubix Docs
            • A7: 2021 | JWT Tokens (11) | Cycubix Docs
            • A7: 2021 | JWT Tokens (12) | Cycubix Docs
            • A7: 2021 | JWT Tokens (13) | Cycubix Docs
            • A7: 2021 | JWT Tokens (14) | Cycubix Docs
            • A7: 2021 | JWT Tokens (15) | Cycubix Docs
            • A7: 2021 | JWT Tokens (16) | Cycubix Docs
            • A7: 2021 | JWT Tokens (17) | Cycubix Docs
            • A7: 2021 | JWT Tokens (18) | Cycubix Docs
            • A7: 2021 | JWT Tokens (19) | Cycubix Docs
          • A7:2021 | Password Reset | Cycubix Docs
            • A7:2021 | Password Reset (1) | Cycubix Docs
            • A7:2021 | Password Reset (2) | Cycubix Docs
            • A7:2021 | Password Reset (3) | Cycubix Docs
            • A7:2021 | Password Reset (4) | Cycubix Docs
            • A7:2021 | Password Reset (5) | Cycubix Docs
            • A7:2021 | Password Reset (6) | Cycubix Docs
            • A7:2021 | Password Reset (7) | Cycubix Docs
          • A7:2021 | Secure Passwords | Cycubix Docs
            • A7:2021 | Secure Passwords (1) | Cycubix Docs
            • A7:2021 | Secure Passwords (2) | Cycubix Docs
            • A7:2021 | Secure Passwords (3) | Cycubix Docs
            • A7:2021 | Secure Passwords (4) | Cycubix Docs
            • A7:2021 | Secure Passwords (5) | Cycubix Docs
            • A7:2021 | Secure Passwords (6) | Cycubix Docs
        • A8:2021 | Software and Data Integrity | Cycubix Docs
          • A8:2021 | Software and Data Integrity | Insecure Deserialization (1) | Cycubix Docs
          • A8:2021 | Software and Data Integrity | Insecure Deserialization (2) | Cycubix Doc
          • A8:2021 | Software and Data Integrity | Insecure Deserialization (3) | Cycubix Doc
          • A8:2021 | Software and Data Integrity | Insecure Deserialization (4) | Cycubix Doc
          • A8:2021 | Software and Data Integrity | Insecure Deserialization (5) | Cycubix Doc
        • A9:2021 | Security Logging Failures | Cycubix Docs
          • A9:2021 | Logging Security (1) | Cycubix Docs
          • A9:2021 | Logging Security (2) | Cycubix Docs
          • A9:2021 | Logging Security (3) | Cycubix Docs
          • A9:2021 | Logging Security (4) | Cycubix Docs
          • A9:2021 | Logging Security (5) | Cycubix Docs
        • A10: 2021 | Server Side Request Forgery | Cycubix Docs
          • A10:2021 | Server Side Request Forgery | Cross Site Request Forgery | Cycubix Docs
            • A10:2021 | Server Side Request Forgery | Cross Site Request Forgery (1) | Cycubix Docs
            • A10:2021 | Server Side Request Forgery | Cross Site Request Forgery (2) | Cycubix Docs
            • A10:2021 | Server Side Request Forgery | Cross Site Request Forgery (3) | Cycubix Docs
            • A10:2021 | Server Side Request Forgery | Cross Site Request Forgery (4) | Cycubix Docs
            • A10:2021 | Server Side Request Forgery | Cross Site Request Forgery (5) | Cycubix Docs
            • A10:2021 | Server Side Request Forgery | Cross Site Request Forgery (6) | Cycubix Docs
            • A10:2021 | Server Side Request Forgery | Cross Site Request Forgery (7) | Cycubix Docs
            • A10:2021 | Server Side Request Forgery | Cross Site Request Forgery (8) | Cycubix Docs
            • A10:2021 | Server Side Request Forgery | Cross Site Request Forgery (9) | Cycubix Docs
          • A10:2021 | Client Side Request Forgery | Cycubix Docs
            • A10:2021 | Server Side Request Forgery (1) | Cycubix Docs
            • A10:2021 | Server Side Request Forgery (2) | Cycubix Docs
            • A10:2021 | Server Side Request Forgery (3) | Cycubix Docs
            • A10:2021 | Server Side Request Forgery (4) | Cycubix Docs
        • Client Side | Cycubix Docs
          • Client Side | Bypass Front End Restrictions | Cycubix Docs
            • Client Side | Bypass Front End Restrictions (1) | Cycubix Docs
            • Client Side | Bypass Front End Restrictions (2) | Cycubix Docs
            • Client Side | Bypass Front End Restrictions (3) | Cycubix Docs
          • Client Side Filtering | Cycubix Docs
            • Client Side | Client Side Filtering (1) | Cycubix Docs
            • Client Side | Client Side Filtering (2) | Cycubix Docs
            • Client Side | Client Side Filtering (3) | Cycubix Docs
          • Client Side | HTML Tampering | Cycubix Docs
            • Client Side | HTML Tampering (1) | Cycubix Docs
            • Client Side | HTML Tampering (2) | Cycubix Docs
            • Client Side | HTML Tampering (3) | Cycubix Docs
        • Challenges | Cycubix Docs
          • Challenges | Admin Lost Password | Cycubix Docs
          • Challenges | Without password | Cycubix Docs
          • Challenges | Admin Password Reset | Cycubix Docs
          • Challenges | Without Account | Cycubox Docs
  • ISC2 Courses
    • CCSP
      • CCSP Domains
      • CCSP Resource Materials
        • CCSP Mind Map | Cycubix Docs
        • CCSP Official Study Guide
        • CCSP Official Practice Tests
        • CCSP Online Test Bank
    • CISSP
      • CISSP Domains
        • Domain 1: Security and Risk Management
        • Domain 2: Asset Security
          • Link Encryption vs End-to-End Encryption
        • Domain 3: Security Architecture and Engineering
        • Domain 4: Communication and Network Security
        • Domain 5: Identity and Access Management (IAM)
        • Domain 6: Security Assessment and Testing
        • Domain 7: Security Operations
        • Domain 8: Software Development Security
      • CISSP Resource Materials
        • CISSP Official Flashcards
        • CISSP Mind Map | Cycubix Docs
        • CISSP Exam Outline
        • CISSP Official Study Guide
        • CISSP Official Practice Tests
        • CISSP Online Test Bank
        • CISSP Glossary
    • CSSLP
      • CSSLP Resource Materials
        • ISC2 CSSLP Official Flashcards
        • CSSLP Mind Map | Cycubix Docs
        • CSSLP Exam Outline | Cycubix Docs
    • Lexicon
      • A
      • B
  • AWS Courses
    • AWS Certified Security – Specialty (SCS-C02)
  • Crowdstrike
    • Troubleshooting Mac Devices
      • Mac sensors on macOS Ventura may fail to remove Falcon.app when uninstalling
      • System Extensions not activated
  • Jamf
    • Jamf Protect
Powered by GitBook
On this page
  • Stored XSS
  • It is your turn!

Was this helpful?

  1. Application Security Series
  2. Web Application Security Essentials
  3. WebGoat Labs | Web Application Security Essentials | Cycubix Docs
  4. A3:2021 | Injection | Cycubix Docs
  5. A3:2021 | Cross Site Scripting Mitigation | Cycubix Docs

A3:2021 | Cross Site Scripting Mitigation (6) |

PreviousA3:2021 | Cross Site Scripting Mitigation (5) | Cycubix DocsNextA3:2021 | Path Transversal | Cycubix Docs

Last updated 11 months ago

Was this helpful?

Stored XSS

One way to prevent stored XSS is the usage of . AntiSamy can produce a "clean" string based on an adjustable policy file.

See the java class below, which saves a comment into a database.

public class MyCommentDAO {

    public static void addComment(int threadID, int userID, String newComment) {

                String sql = "INSERT INTO COMMENTS(THREADID, USERID, COMMENT) VALUES(?,?,?);";

                try {
                        PreparedStatement stmt = connection.prepareStatement(sql);

                        stmt.setInt(1, threadID);
                        stmt.setInt(2, userID);
                        stmt.setString(3, newComment);

                        stmt.executeUpdate();
                } catch (SQLException e) {
                        e.printStackTrace();
                }
        }
}

And here is a Java class that uses the addComment function

import org.owasp.validator.html.*;
import MyCommentDAO;

public class AntiSamyController {
    ...
    public void saveNewComment(int threadID, int userID, String newComment){
        MyCommentDAO.addComment(threadID, userID, newComment);
    }
    ...
}

As you can see the Java file stores unfiltered user input into the database. You have the whole malicious code stored in your database now.

It is your turn!

Try to prevent this kind of XSS by creating a clean string inside the saveNewComment() function. Use the "antisamy-slashdot.xml" as a policy file for this example:

Solution

  • Hints: Try to have a look at the AntiSamy documentation.

  • Looking at the documentation will allow us to add the necessary imports.

  • When you implement the code, dpeloy and test the application be ensure that user inputs are sanitized correctly, thus mitigating XSS vulnerabilities.

The solution code is the following:

import org.owasp.validator.html.*;  
import MyCommentDAO;  
  
public class AntiSamyController {  
     public void saveNewComment(int threadID, int userID, String newComment){  
         Policy p = Policy.getInstance("antisamy-slashdot.xml");  
         AntiSamy as = new AntiSamy();  
         CleanResults cr = as.scan(newComment, p, AntiSamy.DOM);  
         MyCommentDAO.addComment(threadID, userID, cr.getCleanHTML());  
     }  
}  

We also need to create a policy file: you can find it in this repository.

OWASP AntiSamy
https://github.com/nahsra/antisamy