wp-user-enum: WordPress REST API User Enumeration

id: wp-user-enum

info:
  name: WordPress REST API User Enumeration
  author: Manas_Harsh,daffainfo,geeknik,dr0pd34d
  severity: low
  description: |
    The REST API exposed user data for all users who had authored a post of a public post type. WordPress 4.7.1 limits this to only post types which have specified that they should be shown within the REST API.
  impact: |
    An attacker can easily determine valid usernames, which can lead to targeted attacks such as brute force attacks or social engineering.
  remediation: |
    Install a WordPress plugin such as Stop User Enumeration. Stop User Enumeration is a security plugin designed to detect and prevent hackers scanning your site for user names.
  reference:
    - https://www.acunetix.com/vulnerabilities/web/wordpress-rest-api-user-enumeration/
    - https://wordpress.org/plugins/stop-user-enumeration/
    - https://www.afteractive.com/wordpress-user-enumeration-vulnerability/
  classification:
    cpe: cpe:2.3:a:wordpress:wordpress:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 2
    vendor: wordpress
    product: wordpress
    shodan-query:
      - http.component:"WordPress"
      - http.component:"wordpress"
      - cpe:"cpe:2.3:a:wordpress:wordpress"
  tags: cve2017,cve,wordpress,wp,edb,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/wp-json/wp/v2/users/"
      - "{{BaseURL}}/?rest_route=/wp/v2/users/"

    stop-at-first-match: true

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '"id":'
          - '"name":'
          - '"slug":'
        condition: and

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

      - type: status
        status:
          - 200

    extractors:
      - type: json
        name: "usernames"
        json:
          - '.[] | .slug'
          - '.[].name'
        part: body
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