FileZilla Server < 0.9.22 - DoS via Wildcard Commands

id: CVE-2006-6565

info:
  name: FileZilla Server < 0.9.22 - DoS via Wildcard Commands
  author: pussycat0x
  severity: medium
  description: |
    FileZilla Server versions prior to 0.9.22 are vulnerable to remote denial of service (crash) when processing wildcard arguments to LIST/NLST commands, malformed PORT commands, or other malformed commands. This leads to NULL pointer dereference that can crash the server.
  impact: |
    Authenticated attackers can cause denial of service by sending malformed wildcard arguments in LIST/NLST commands or malformed PORT commands, triggering NULL pointer dereference that crashes the FTP server.
  remediation: |
    Update FileZilla Server to version 0.9.22 or later that properly validates command arguments and prevents NULL pointer dereference vulnerabilities.
  reference:
    - http://sourceforge.net/project/shownotes.php?release_id=470364&group_id=21558
    - http://www.vupen.com/english/advisories/2006/4937
    - https://exchange.xforce.ibmcloud.com/vulnerabilities/30853
  classification:
    cvss-metrics: CVSS:2.0/AV:N/AC:L/Au:S/C:N/I:N/A:P
    cvss-score: 4
    cve-id: CVE-2006-6565
    cwe-id: CWE-476
    epss-score: 0.70588
    epss-percentile: 0.99396
    cpe: cpe:2.3:a:filezilla-project:filezilla_server:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: filezilla-project
    product: filezilla_server
    shodan-query: product:"FileZilla"
  tags: cve,cve2006,network,ftp,filezilla,tcp,passive,vuln

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

    host:
      - "{{Hostname}}"

    port: 21
    read-size: 1024

    matchers:
      - type: dsl
        dsl:
          - "contains(raw, 'FileZilla')"
          - "compare_versions(version, '< 0.9.22')"
        condition: and

    extractors:
      - type: regex
        group: 1
        name: version
        regex:
          - "FileZilla Server version ([0-9.]+)"