题目环境

只有一个页面

只有一个密码框

解题过程

F12看源码,发现有一串混淆过的JS代码

1
2

var _0x575c=['\x32\x2d\x34','\x73\x75\x62\x73\x74\x72\x69\x6e\x67','\x34\x2d\x37','\x67\x65\x74\x49\x74\x65\x6d','\x64\x65\x6c\x65\x74\x65\x49\x74\x65\x6d','\x31\x32\x2d\x31\x34','\x30\x2d\x32','\x73\x65\x74\x49\x74\x65\x6d','\x39\x2d\x31\x32','\x5e\x37\x4d','\x75\x70\x64\x61\x74\x65\x49\x74\x65\x6d','\x62\x62\x3d','\x37\x2d\x39','\x31\x34\x2d\x31\x36','\x6c\x6f\x63\x61\x6c\x53\x74\x6f\x72\x61\x67\x65',];(function(_0x4f0aae,_0x575cf8){var _0x51eea2=function(_0x180eeb){while(--_0x180eeb){_0x4f0aae['push'](_0x4f0aae['shift']());}};_0x51eea2(++_0x575cf8);}(_0x575c,0x78));var _0x51ee=function(_0x4f0aae,_0x575cf8){_0x4f0aae=_0x4f0aae-0x0;var _0x51eea2=_0x575c[_0x4f0aae];return _0x51eea2;};function CheckPassword(_0x47df21){var _0x4bbdc3=[_0x51ee('0xe'),_0x51ee('0x3'),_0x51ee('0x7'),_0x51ee('0x4'),_0x51ee('0xa')];window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]]('9-12','BE*');window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]](_0x51ee('0x2'),_0x51ee('0xb'));window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]](_0x51ee('0x6'),'5W');window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]]('16',_0x51ee('0x9'));window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]](_0x51ee('0x5'),'pg');window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]]('7-9','+n');window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]](_0x51ee('0xd'),'4t');window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]](_0x51ee('0x0'),'$F');if(window[_0x4bbdc3[0x0]][_0x4bbdc3[0x1]](_0x51ee('0x8'))===_0x47df21[_0x51ee('0x1')](0x9,0xc)){if(window[_0x4bbdc3[0x0]][_0x4bbdc3[0x1]](_0x51ee('0x2'))===_0x47df21['substring'](0x4,0x7)){if(window[_0x4bbdc3[0x0]][_0x4bbdc3[0x1]](_0x51ee('0x6'))===_0x47df21[_0x51ee('0x1')](0x0,0x2)){if(window[_0x4bbdc3[0x0]][_0x4bbdc3[0x1]]('16')===_0x47df21[_0x51ee('0x1')](0x10)){if(window[_0x4bbdc3[0x0]][_0x4bbdc3[0x1]](_0x51ee('0x5'))===_0x47df21[_0x51ee('0x1')](0xc,0xe)){if(window[_0x4bbdc3[0x0]][_0x4bbdc3[0x1]](_0x51ee('0xc'))===_0x47df21[_0x51ee('0x1')](0x7,0x9)){if(window[_0x4bbdc3[0x0]][_0x4bbdc3[0x1]](_0x51ee('0xd'))===_0x47df21[_0x51ee('0x1')](0xe,0x10)){if(window[_0x4bbdc3[0x0]][_0x4bbdc3[0x1]](_0x51ee('0x0'))===_0x47df21[_0x51ee('0x1')](0x2,0x4))return!![];}}}}}}}return![];}

去常见js混淆网站

Obfuscator.io Deobfuscator (deobfuscate.io)

去混淆结果

var _0x575c = ["2-4", "substring", "4-7", "getItem", "deleteItem", "12-14", "0-2", "setItem", "9-12", "^7M", "updateItem", "bb=", "7-9", "14-16", "localStorage"];
(function (_0x4f0aae, _0x575cf8) {
  var _0x51eea2 = function (_0x180eeb) {
    while (--_0x180eeb) {
      _0x4f0aae.push(_0x4f0aae.shift());
    }
  };
  _0x51eea2(++_0x575cf8);
})(_0x575c, 0x78);
var _0x51ee = function (_0x4f0aae, _0x575cf8) {
  _0x4f0aae = _0x4f0aae - 0x0;
  var _0x51eea2 = _0x575c[_0x4f0aae];
  return _0x51eea2;
};
function CheckPassword(_0x47df21) {
  var _0x4bbdc3 = [_0x51ee('0xe'), _0x51ee('0x3'), _0x51ee('0x7'), _0x51ee('0x4'), _0x51ee('0xa')];
  window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]]('9-12', 'BE*');
  window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]](_0x51ee('0x2'), _0x51ee('0xb'));
  window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]](_0x51ee('0x6'), '5W');
  window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]]('16', _0x51ee('0x9'));
  window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]](_0x51ee('0x5'), 'pg');
  window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]]('7-9', '+n');
  window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]](_0x51ee('0xd'), '4t');
  window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]](_0x51ee('0x0'), '$F');
  if (window[_0x4bbdc3[0x0]][_0x4bbdc3[0x1]](_0x51ee('0x8')) === _0x47df21[_0x51ee('0x1')](0x9, 0xc)) {
    if (window[_0x4bbdc3[0x0]][_0x4bbdc3[0x1]](_0x51ee('0x2')) === _0x47df21.substring(0x4, 0x7)) {
      if (window[_0x4bbdc3[0x0]][_0x4bbdc3[0x1]](_0x51ee('0x6')) === _0x47df21[_0x51ee('0x1')](0x0, 0x2)) {
        if (window[_0x4bbdc3[0x0]][_0x4bbdc3[0x1]]('16') === _0x47df21[_0x51ee('0x1')](0x10)) {
          if (window[_0x4bbdc3[0x0]][_0x4bbdc3[0x1]](_0x51ee('0x5')) === _0x47df21[_0x51ee('0x1')](0xc, 0xe)) {
            if (window[_0x4bbdc3[0x0]][_0x4bbdc3[0x1]](_0x51ee('0xc')) === _0x47df21[_0x51ee('0x1')](0x7, 0x9)) {
              if (window[_0x4bbdc3[0x0]][_0x4bbdc3[0x1]](_0x51ee('0xd')) === _0x47df21[_0x51ee('0x1')](0xe, 0x10)) {
                if (window[_0x4bbdc3[0x0]][_0x4bbdc3[0x1]](_0x51ee('0x0')) === _0x47df21[_0x51ee('0x1')](0x2, 0x4)) {
                  return true;
                }
              }
            }
          }
        }
      }
    }
  }
  return false;
}

虽然还是没啥变化，但前两行代码解密后根据内容可以推测代码将一些信息存储在了本地的storage

1	var _0x575c = ["2-4", "substring", "4-7", "getItem", "deleteItem", "12-14", "0-2", "setItem", "9-12", "^7M", "updateItem", "bb=", "7-9", "14-16", "localStorage"];

将上面的代码提取出变量在控制台执行

var _0x575c = ["2-4", "substring", "4-7", "getItem", "deleteItem", "12-14", "0-2", "setItem", "9-12", "^7M", "updateItem", "bb=", "7-9", "14-16", "localStorage"];
(function (_0x4f0aae, _0x575cf8) {
  var _0x51eea2 = function (_0x180eeb) {
    while (--_0x180eeb) {
      _0x4f0aae.push(_0x4f0aae.shift());
    }
  };
  _0x51eea2(++_0x575cf8);
})(_0x575c, 0x78);
var _0x51ee = function (_0x4f0aae, _0x575cf8) {
  _0x4f0aae = _0x4f0aae - 0x0;
  var _0x51eea2 = _0x575c[_0x4f0aae];
  return _0x51eea2;
};

  var _0x4bbdc3 = [_0x51ee('0xe'), _0x51ee('0x3'), _0x51ee('0x7'), _0x51ee('0x4'), _0x51ee('0xa')];
  window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]]('9-12', 'BE*');
  window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]](_0x51ee('0x2'), _0x51ee('0xb'));
  window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]](_0x51ee('0x6'), '5W');
  window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]]('16', _0x51ee('0x9'));
  window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]](_0x51ee('0x5'), 'pg');
  window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]]('7-9', '+n');
  window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]](_0x51ee('0xd'), '4t');
  window[_0x4bbdc3[0x0]][_0x4bbdc3[0x2]](_0x51ee('0x0'), '$F');