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From: dsoeder at (Derek Soeder)
Subject: EEYE: Windows Shell ZIP File Decompression DUNZIP32.DLL Buffer Overflow Vulnerability

Windows Shell ZIP File Decompression DUNZIP32.DLL Buffer Overflow

Release Date:
October 12, 2004

Date Reported:
August 2, 2004

High (Code Execution)


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

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.

Retina Network Security Scanner has been updated to identify this

Vendor Status:
Microsoft has released a patch for this vulnerability. The patch is
available at:

Discovery: Yuji Ukai

Related Links:
Retina Network Security Scanner - Free 15 Day Trial

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
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