Carel pCOWeb < B1.2.1 - Credentials Disclosure

# Exploit Title: Carel pCOWeb - Unprotected Storage of Credentials
# Date: 2019-04-16
# Exploit Author: Luca.Chiou
# Vendor Homepage: https://www.carel.com/
# Version: Carel pCOWeb all versions prior to B1.2.1
# Tested on: It is a proprietary devices: http://www.carel.com/product/pcoweb-card

# 1. Description:
# The devices, Carel pCOWeb, store plaintext passwords,
# which may allow sensitive information to be read by someone with access to the device.

# 2. Proof of Concept:
# Browse the maintain user page in website:
# http://<Your<http://%3cYour> Modem IP>/config/pw_changeusers.html
# The user's information include Description, Username and Password.
# In user page, we can find out that user passwords stored in plaintext.