CVE-2021-40524: Pure-FTPd 1.0.23 < 1.0.50 - Arbitrary File Upload

id: CVE-2021-40524

info:
  name: Pure-FTPd 1.0.23 < 1.0.50 - Arbitrary File Upload
  author: pussycat0x
  severity: high
  description: |
    Pure-FTPd versions 1.0.23 through 1.0.49 contain an arbitrary file upload vulnerability due to max_filesize quota issue, allowing large or unbounded file uploads that can cause server hang or resource exhaustion.
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    cvss-score: 7.5
    cve-id: CVE-2021-40524
    cwe-id: CWE-434
    epss-score: 0.21104
    epss-percentile: 0.95408
    cpe: cpe:2.3:a:pureftpd:pure-ftpd:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: pureftpd
    product: pure-ftpd
    shodan-query:
      - product:"pure-ftpd" version:"1.0.45"
      - cpe:"cpe:2.3:a:pureftpd:pure-ftpd"
  tags: cve,cve2021,network,ftp,pure-ftpd,tcp,passive,vuln

tcp:
  - inputs:
      - data: 00000000
        type: hex

    host:
      - "{{Hostname}}"

    port: 21
    read-size: 1024

    matchers:
      - type: dsl
        dsl:
          - "contains(raw, 'Pure-FTPd')"
          - "compare_versions(version, '> 1.0.23 ', '<= 1.0.50')"
        condition: and

    extractors:
      - type: regex
        group: 1
        name: version
        regex:
          - "Pure-FTPd ([0-9.]+)"
# digest: 490a0046304402203ec444be84ca5fe8c6ccd7abd44f3f1c7d9cd514f417976f2be0f3c9111cc96102202b792af603cc4ea2c4e062c28497fe21c2744da38e57eece0f333a4a7b98cb9a:922c64590222798bb761d5b6d8e72950