ftp-anonymous-check: Anonymous FTP Disabled Check

id: ftp-anonymous-check

info:
  name: Anonymous FTP Disabled Check
  author: nukunga[SungHyunJeon]
  severity: medium
  description: |
    Ensure that anonymous FTP authentication is disabled on all FTP sites. Allowing anonymous access permits unauthenticated users to connect, which can lead to serious security vulnerabilities.
  impact: |
    If anonymous FTP is enabled, attackers can bypass authentication and potentially gain unauthorized access to FTP resources, posing a significant security risk.
  remediation: |
    Disable anonymous FTP authentication using IIS Manager:
    - Open IIS Manager.
    - Navigate to the FTP site → FTP Authentication.
    - Set "Anonymous Authentication" to Disabled.
  reference:
    - https://isms.kisa.or.kr/main/csap/notice/?boardId=bbs_0000000000000004&mode=view&cntId=85
  tags: ftp,iis,security,code,windows-audit,kisa

self-contained: true

code:
  - pre-condition: |
      IsWindows();
    engine:
      - powershell
      - powershell.exe
    args:
      - -ExecutionPolicy
      - Bypass
    pattern: "*.ps1"
    source: |
      Import-Module WebAdministration -ErrorAction SilentlyContinue
      $ftpSites = Get-ChildItem IIS:\Sites | Where-Object { $_.Bindings.Collection.Protocol -eq "ftp" }
      $vulnerable = $false
      foreach ($site in $ftpSites) {
          $anonAuth = Get-WebConfigurationProperty -pspath "MACHINE/WEBROOT/APPHOST/$($site.Name)" -filter "system.ftpServer/security/authentication/anonymousAuthentication" -name "enabled" -ErrorAction SilentlyContinue
          if ($anonAuth -eq $true) {
              $vulnerable = $true
              break
          }
      }
      if ($vulnerable) {
          "ANONYMOUS_FTP_ENABLED"
      } else {
          "ANONYMOUS_FTP_DISABLED"
      }

    matchers:
      - type: word
        words:
          - "ANONYMOUS_FTP_ENABLED"
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