id: CVE-2019-18217

info:
  name: ProFTPD < 1.3.6b - Remote Unauthenticated DoS
  author: pussycat0x
  severity: high
  description: |
    ProFTPD versions before 1.3.6b and various pre-release versions (1.3.7rc before 1.3.7rc2) are vulnerable to remote unauthenticated denial of service. The vulnerability occurs when processing overly long commands, causing an infinite loop in a child process that can crash the server.
  impact: |
    Unauthenticated attackers can send overly long FTP commands to cause infinite loop in a child process, leading to denial of service by crashing the ProFTPD server.
  remediation: |
    Update ProFTPD to version 1.3.6b or later that properly validates command length and prevents infinite loop conditions in command processing.
  reference:
    - http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00009.html
    - https://cert-portal.siemens.com/productcert/pdf/ssa-940889.pdf
    - https://github.com/proftpd/proftpd/blob/1.3.6/NEWS
    - https://github.com/proftpd/proftpd/blob/1.3.6/RELEASE_NOTES
    - https://github.com/proftpd/proftpd/blob/master/NEWS
  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-2019-18217
    cwe-id: CWE-835
    epss-score: 0.19507
    epss-percentile: 0.97085
    cpe: cpe:2.3:a:proftpd:proftpd:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: proftpd
    product: proftpd
    shodan-query:
      - product:"proftpd"
      - cpe:"cpe:2.3:a:proftpd:proftpd"
  tags: cve,cve2019,network,ftp,proftpd,tcp,passive,vuln

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

    host:
      - "{{Hostname}}"
    port: 21
    read-size: 1024

    matchers:
      - type: dsl
        dsl:
          - "contains(raw, 'ProFTPD')"
          - "compare_versions(version, '< 1.3.6b')"
        condition: and

    extractors:
      - type: regex
        group: 1
        name: version
        regex:
          - "ProFTPD ([0-9.a-z]+)"
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