ProFTPD < 1.3.8a - DoS via Out-of-Bounds Read

id: CVE-2023-51713

info:
  name: ProFTPD < 1.3.8a - DoS via Out-of-Bounds Read
  author: pussycat0x
  severity: high
  description: |
    ProFTPD versions before 1.3.8a contain a one-byte out-of-bounds read vulnerability in the make_ftp_cmd function within main.c. This vulnerability can lead to a daemon crash, causing denial of service.
  impact: |
    Attackers can crash the ProFTPD daemon by triggering an out-of-bounds read in the make_ftp_cmd function, causing service disruption and denying legitimate users access to FTP services.
  remediation: |
    Upgrade to ProFTPD version 1.3.8a or later that fixes the out-of-bounds read vulnerability in the make_ftp_cmd function.
  reference:
    - https://github.com/proftpd/proftpd/blob/1.3.8/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-2023-51713
    cwe-id: CWE-125
    epss-score: 0.04249
    epss-percentile: 0.91126
    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,cve2023,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, '< 1.3.8a')"
        condition: and

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