EEYE: Windows Shell ZIP File Decompression DUNZIP32.DLL Buffer Overflow Vulnerability

From: Derek Soeder (dsoeder_at_EEYE.COM)
Date: 10/13/04

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    Date:         Tue, 12 Oct 2004 21:49:05 -0700
To: NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM

    Windows Shell ZIP File Decompression DUNZIP32.DLL Buffer Overflow
    Vulnerability

    Release Date:
    October 12, 2004

    Date Reported:
    August 2, 2004

    Severity:
    High (Code Execution)

    Vendor:
    Microsoft

    Systems Affected:
    Windows XP (SP1 and earlier)
    Windows Me

    Overview:
    eEye Digital Security has discovered a buffer overflow in DUNZIP32.DLL,
    a module that offers support for ZIP compressed folders in the Windows
    shell. An exploitable buffer overflow occurs when a user opens a ZIP
    folder that contains a long file name.

    Technical Details:
    This buffer overflow is triggered by an integer overflow. When a ZIP
    file containing a long file name (greater than around 0x8000 bytes) is
    opened in the Windows shell as a ZIP compressed folder, a stack-based
    buffer overflow occurs, allowing an exception handler to be overwritten
    and EIP to be hijacked.

    Protection:
    Retina Network Security Scanner has been updated to identify this
    vulnerability.

    Vendor Status:
    Microsoft has released a patch for this vulnerability. The patch is
    available at:
    http://www.microsoft.com/technet/security/bulletin/MS04-034.mspx

    Credit:
    Discovery: Yuji Ukai

    Related Links:
    Retina Network Security Scanner - Free 15 Day Trial
    http://www.eeye.com/html/Products/Retina/download.html

    Greetings:
    R.Kanai, Y.Watanabe - Welcome to eEye Japan Team, All Black Hat Japan
    2004 attendees, and AV2K4 attendees.

    Copyright (c) 1998-2004 eEye Digital Security
    Permission is hereby granted for the redistribution of this alert
    electronically. It is not to be edited in any way without express
    consent of eEye. If you wish to reprint the whole or any part of this
    alert in any other medium excluding electronic medium, please email
    alert@eEye.com for permission.

    Disclaimer
    The information within this paper may change without notice. Use of this
    information constitutes acceptance for use in an AS IS condition. There
    are no warranties, implied or express, with regard to this information.
    In no event shall the author be liable for any direct or indirect
    damages whatsoever arising out of or in connection with the use or
    spread of this information. Any use of this information is at the user's
    own risk. 

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