Research Archives > Security Advisories > AD20041012A

Windows Shell ZIP File Decompression DUNZIP32.DLL Buffer Overflow Vulnerability

Release Date:
10/12/2004 12:00:00 AM

Date Reported:
8/2/2004 12:00:00 AM

Severity:
High

Vendor:
Microsoft

Affected Software:
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

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

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