# Python Internal Read Gadgets

{% hint style="success" %}
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## Basic Information

Different vulnerabilities such as [**Python Format Strings**](../bypass-python-sandboxes#python-format-string) or [**Class Pollution**](class-pollution-pythons-prototype-pollution) might allow you to **read python internal data but won't allow you to execute code**. Therefore, a pentester will need to make the most of these read permissions to **obtain sensitive privileges and escalate the vulnerability**.

### Flask - Read secret key

The main page of a Flask application will probably have the **`app`** global object where this **secret is configured**.

```python
app = Flask(__name__, template_folder='templates')
app.secret_key = '(:secret:)'
```

In this case it's possible to access this object just using any gadget to **access global objects** from the [**Bypass Python sandboxes page**](bypass-python-sandboxes).

In the case where **the vulnerability is in a different python file**, you need a gadget to traverse files to get to the main one to **access the global object `app.secret_key`** to change the Flask secret key and be able to [**escalate privileges** knowing this key](../../../network-services-pentesting/pentesting-web/flask#flask-unsign).

A payload like this one [from this writeup](https://ctftime.org/writeup/36082):

{% code overflow="wrap" %}
```python
__init__.__globals__.__loader__.__init__.__globals__.sys.modules.__main__.app.secret_key
```
{% endcode %}

Use this payload to **change `app.secret_key`** (the name in your app might be different) to be able to sign new and more privileges flask cookies.

### Werkzeug - machine\_id and node uuid

[**Using these payload from this writeup**](https://vozec.fr/writeups/tweedle-dum-dee/) you will be able to access the **machine\_id** and the **uuid** node, which are the **main secrets** you need to [**generate the Werkzeug pin**](../../network-services-pentesting/pentesting-web/werkzeug) you can use to access the python console in `/console` if the **debug mode is enabled:**

```python
{ua.__class__.__init__.__globals__[t].sys.modules[werkzeug.debug]._machine_id}
{ua.__class__.__init__.__globals__[t].sys.modules[werkzeug.debug].uuid._node}
```

{% hint style="warning" %}
Note that you can get the **servers local path to the `app.py`** generating some **error** in the web page which will **give you the path**.
{% endhint %}

If the vulnerability is in a different python file, check the previous Flask trick to access the objects from the main python file.

{% hint style="success" %}
Learn & practice AWS Hacking:<img src="https://4053168017-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FbkAZDoSuRHGdNlWHdyKs%2Fuploads%2Fgit-blob-ce8af1068db7be4ad9003f8ddb02fea8f943f1a4%2Farte.png?alt=media" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="https://4053168017-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FbkAZDoSuRHGdNlWHdyKs%2Fuploads%2Fgit-blob-ce8af1068db7be4ad9003f8ddb02fea8f943f1a4%2Farte.png?alt=media" alt="" data-size="line">\
Learn & practice GCP Hacking: <img src="https://4053168017-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FbkAZDoSuRHGdNlWHdyKs%2Fuploads%2Fgit-blob-54ee1fb931f39d1e6f50150361b6aa1927f4ee88%2Fgrte.png?alt=media" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="https://4053168017-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FbkAZDoSuRHGdNlWHdyKs%2Fuploads%2Fgit-blob-54ee1fb931f39d1e6f50150361b6aa1927f4ee88%2Fgrte.png?alt=media" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)

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</details>
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