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bugtraq: iDefense Security Advisory 08.20.07: Trend Micro SSAPI

iDefense Security Advisory 08.20.07: Trend Micro SSAPI Long Path Buffer Overflow Vulnerability

From: iDefense Labs <labs-no-reply_at_nospam>
Date: Tue Aug 21 2007 - 19:16:59 GMT
To: vulnwatch@vulnwatch.org, full-disclosure@lists.grok.org.uk, bugtraq@securityfocus.com

Trend Micro SSAPI Long Path Buffer Overflow Vulnerability

iDefense Security Advisory 08.20.07
http://labs.idefense.com/intelligence/vulnerabilities/ Aug 20, 2007

I. BACKGROUND 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.


II. DESCRIPTION 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.

III. ANALYSIS 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 share.

IV. DETECTION 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.

V. WORKAROUND iDefense is currently unaware of any workarounds for this issue.

VI. VENDOR RESPONSE Trend Micro has addressed this vulnerability by releasing a HotFix. For more information consult their Knowledge Base article at the following URL. http://esupport.trendmicro.com/support/consumer/search.do?cmd=displayKC&externalId=PUB-en-1035845

VII. CVE INFORMATION 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 (http://cve.mitre.org/), which standardizes names for security problems.

VIII. DISCLOSURE TIMELINE 07/12/2007 Initial vendor notification 07/16/2007 Initial vendor response 08/20/2007 Coordinated public disclosure

IX. CREDIT This vulnerability was reported to iDefense by Ismael Briones.

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X. LEGAL NOTICES Copyright © 2007 iDefense, Inc.

Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDefense. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please e-mail customerservice@idefense.com for permission.

Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition.  There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.