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[SNS Advisory No.34] TrendMicro InterScan VirusWall 3.51 smtpscan.dll Buffer Overflow
From: "SNS Advisory" <snsadv () lac co jp>
Date: Thu, 28 Jun 2001 17:30:17 +0900

SNS Advisory No.34
TrendMicro InterScan VirusWall 3.51 smtpscan.dll Buffer Overflow

Problem first discovered: Wed, 6 Jun 2001
Published: Thu, 28 Jun 2001

A buffer overflow vulnerability was found in some administrative programs, 
smtpscan.dll, of InterScan VirusWall for Windows NT. It allows a remote
user to execute an arbitrary command with SYSTEM privilege.

If long strings are included in a certain parameter of configuration by 
exploiting the vulnerability that was reported by SNS Advisory No.28, 
a buffer overflow occurs when requesting the following dll:


The following are a memory dump and contents of register when a buffer 
overflow occurs.

      00F8E5C0 71 71 71 72 72 72 72 73 qqqrrrrs
      00F8E5C8 73 73 73 74 74 74 74 75 sssttttu

     EIP=73727272 ESP=00F8E5C8

Therefore, arbitrary code may be executed by calling esp which may be 
replaced by an attacker's supplied arbitrary code. 

Tested Version:
InterScan VirusWall for Windows NT 3.51 English

Tested OS:
Windows NT 4.0 Server SP6a [English Version] 

Patch Information:
To get the patch, send e-mail to support () support trendmicro com or
search this issue on

Discovered by:
Nobuo Miwa (LAC / n-miwa () lac co jp)

All information in these advisories are subject to change without any 
advanced notices neither mutual consensus, and each of them is released
as it is. LAC Co.,Ltd. is not responsible for any risks of occurrences
caused by applying those information.

Archive of this advisory:

SNS Advisory No.28(TrendMicro InterScan VirusWall for NT remote
configuration Vulnerability)


SNS Advisory:


Secure Net Service(SNS) Security Advisory <snsadv () lac co jp>
Computer Security Laboratory, LAC  http://www.lac.co.jp/security/

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