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CheckMark MultiLedger Buffer Overflow Vulnerability (DUNZIP32.dll)
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SUMMARY
<http://www.checkmark.com/> CheckMarkMultiLedger - "A proven integrated,
networkable financial package for small businesses, MultiLedger is easy to
use and installs quickly".
CheckMark MultiLedger accounting system for Windows is confirmed to be
affected to a buffer overflow vulnerability due to its usage of a
third-party DLL called DUNZIP32.dll.
DETAILS
Vulnerable Systems:
* CheckMark MultiLedger version 6.0.3. Other versions may also be
affected.
* DynaZip library version 3.0.0.14 (According to InnerMedia version
5.00.03 and prior are affected)
Related advisories:
<http://www.securiteam.com/windowsntfocus/6U00D0UBGI.html> Windows Shell
ZIP File Decompression DUNZIP32.DLL Buffer Overflow
The vulnerability is caused due to a boundary error in a 3rd-party
compression library's (DUNZIP32.dll) old, vulnerable version used in
company data restore functions. This can be exploited to cause a buffer
overflow via a specially crafted company backup file. When a specially
crafted .zip backup file containing a file with an overly long filename (a
file name or files inside a ZIP) is opened, the payroll application will
crash and the attacker may be able to execute arbitrary code on user's
system.
Vendor Status:
An updated software version 7.0.2 is available from vendor:
<http://www.checkmark.com/support/patch_win_ml.php>
http://www.checkmark.com/support/patch_win_ml.php
"Installation Instructions: You need at least version 7.0 of MultiLedger
for Windows in order to run this patch."
Software Updates for Registered Users:
<http://www.checkmark.com/order/updates.php>
http://www.checkmark.com/order/updates.php
Workaround:
As a workaround, Dunzip32.dll library can be deleted or renamed, or
un-registered with the Windows "Regsvr32 /u" command.
NOTE: This method breaks application's Backup and Restore functions and is
not recommended.
Disclosure Timeline:
* 24-Jan-2005 - Vulnerability researched and confirmed
* 24-Jan-2005 - Vendor was contacted, workarounds delivered to the vendor
* 24-Jan-2005 - (Vendor's reply to CheckMark Payroll for Windows
vulnerability)
* 04-Mar-2005 - Vendor informed about upcoming, fixed version
* 11-Oct-2005 - Detailed research
* 26-Oct-2005 - Vendor was contacted again
* 26-Oct-2005 - Vendor's reply, vulnerability is fixed
* 28-Oct-2005 - Security companies and several CERT units contacted
ADDITIONAL INFORMATION
The information has been provided by <mailto:juha-matti.laurio@netti.fi>
Juha-Matti Laurio.
The original and article can be found at:
<http://www.networksecurity.fi/advisories/multiledger.html>
http://www.networksecurity.fi/advisories/multiledger.html
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