[NT] TrendMicro Interscan VirusWall Insecurity "Feature"

From: support@securiteam.com
Date: 05/26/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Sun, 26 May 2002 18:55:25 +0200 (CEST)

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  TrendMicro Interscan VirusWall Insecurity "Feature"
------------------------------------------------------------------------

SUMMARY

Trend's Interscan VirusWall has a "feature" in its WinNT/2K implementation
that would assist an attacker, spammer, virus sender, in hiding his
identity.

DETAILS

Vulnerable systems:
 * Interscan VirusWall version 3.52 build 1375

In the most installations of Interscan listens on port 25 (SMTP), receives
the message, scans it, and then re-sends it to the "real" SMTP daemon
(listening on another port), preserving the SMTP-header present in the
message.

However, since it does not include the line found with-in the SMTP-header
with the sender's real IP, the final message header will not contain the
real sender's IP, nor will the program log the real IP of the sender
anywhere.

In other words, if you want to track back the origin of a message, you
cannot use the message header to discover the sender's IP.

Example:
 
============================================================================
Microsoft Mail Internet Headers Version 2.0
Received: from smtp.domain1.com ([172.0.0.1]) by internal.domain1.com with
Microsoft SMTPSVC(5.0.2195.4905);
Thu, 23 May 2002 20:02:08 -0300
Received: from smtp.domain1.com ([172.0.0.1]) by smtp.domain1.com with
Microsoft SMTPSVC(5.0.2195.2966);
Thu, 23 May 2002 20:02:08 -0300
Subject: Test
 
============================================================================

As you can see in this header, it does not include the IP address of the
original message submitter.

ADDITIONAL INFORMATION

The information has been provided by <mailto:PQuintanilha@abril.com.br>
Pedro Quintanilha.

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