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Category:   Application (Security)  >   Trend Micro Anti-Spyware Vendors:   Trend Micro
Trend Micro Anti-Spyware Buffer Overflow in vstlib32.dll Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1018592
SecurityTracker URL:
CVE Reference:   CVE-2007-3873   (Links to External Site)
Date:  Aug 21 2007
Impact:   Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.5
Description:   A vulnerability was reported in Trend Micro Anti-Spyware. A local user can obtain elevated privileges on the target system.

A local user can create a specially crafted pathname to trigger a buffer overflow in the SSAPI's Venus Spy Trap (VST) function and execute arbitrary code on the target system. The code will run with System level privileges.

A remote authenticated user can exploit this vulnerability if a file share is enabled.

PC-cillin Internet Security 2007 is also affected.

The vendor was notified on July 12, 2007.

Ismael Briones reported this vulnerability via iDefense.

Impact:   A local user can obtain System privileges on the target system.
Solution:   The vendor has issued a fix (hot fix - build 1028). Official patches will be available on September 10, 2007.

The Trend Micro advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Boundary error
Underlying OS:  Windows (2000), Windows (Vista), Windows (XP)

Message History:   None.

 Source Message Contents

Subject:  iDefense Security Advisory 08.20.07: Trend Micro SSAPI Long Path

Trend Micro SSAPI Long Path Buffer Overflow Vulnerability

iDefense Security Advisory 08.20.07
Aug 20, 2007


Trend Micro AntiSpyware is a spyware detection and removal application
designed to help protect home users computers, networks and account
information. More information is available on the vendor's site at the
following URL.


Remote exploitation of buffer overflow vulnerability in Trend Micro
Inc.'s SSAPI Engine could allow attackers to execute arbitrary code
with system level privileges.

Trend Micro products which include the VST functionality are vulnerable
to a stack-based buffer overflow in the vstlib32.dll library. This
overflow is triggered when an attacker creates a file on the local file
system with an overly long path. When vstlib32 receives the
ReadDirectoryChangesW callback notification from the Operating System,
a stack based buffer overflow will occur.


Exploitation allows attackers to execute arbitrary code with system
level privilege.

Exploitation requires that attackers are able to create a specially
constructed file path on the machine running the Trend Micro product.
This could be the local machine to gain SYSTEM level privileges, or
could be conducted remotely by writing a file to an accessible network


iDefense confirmed the existence of this vulnerability in vstlib32.dll
version This file is known to be included in several of
Trend Micro's products such as PC-Cillin Internet Security 2007 and
their AntiSpyware products.


iDefense is currently unaware of any workarounds for this issue.


Trend Micro has addressed this vulnerability by releasing a HotFix. For
more information consult their Knowledge Base article at the following


The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-3873 to this issue. This is a candidate for inclusion in
the CVE list (, which standardizes names for
security problems.


07/12/2007  Initial vendor notification
07/16/2007  Initial vendor response
08/20/2007  Coordinated public disclosure


This vulnerability was reported to iDefense by Ismael Briones.

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Copyright © 2007 iDefense, Inc.

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