[NT] CheckMark MultiLedger Buffer Overflow Vulnerability (DUNZIP32.dll)

From: SecuriTeam (support_at_securiteam.com)
Date: 10/31/05

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Date: 31 Oct 2005 08:47:22 +0200

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      CheckMark MultiLedger Buffer Overflow Vulnerability (DUNZIP32.dll)
    ------------------------------------------------------------------------

    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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