Re: Interscan VirusWall NT 3.23/3.3 buffer overflow.

[Bob_Li () TRENDMICRO COM (Bob Li)]

Just to keep everyone updated, Trend has examined the exploit and is
currently in the process of testing an official patch for this problem.
This should be available within a few hours at most.

Thank you,
Bob Li
Product Manager
Trend Micro, Inc.
E-Mail: bob_li () trendmicro com
Phone:  408-863-6341

-----Original Message-----
From: dark spyrit [mailto:dspyrit () BEAVUH ORG]
Sent: Sunday, November 07, 1999 4:52 AM
To: BUGTRAQ () SECURITYFOCUS COM
Subject: Interscan VirusWall NT 3.23/3.3 buffer overflow.

A buffer overflow exists on the VirusWall smtp gateway - by sending a long
HELO command you can overflow the buffer and execute arbitrary code.

Example code has been written which will spawn a command prompt on a port
you specify.

Before you shrug this one off, take a look:

Connected to mail1.microsoft.com.
Escape character is '^]'.
220 mail1.microsoft.com InterScan VirusWall NT ESMTP 3.23 (build 9/10/99)
ready
at Sun, 07 Nov 1999 03:38:44 -0800 (Pacific Standard Time)

The ironic thing here is, VirusWall was designed to prevent viruses and
'malicious code'.

Obviously not a lot of thought was taken before laying their trust into
3rd party 'security' products.

A quick note to the millions out there who would give their right arm to
compromise microsofts network - sorry, their firewall would prevent the
payload from spawning a remote shell.. unless of course it was modified to
stop an existing service to open a port :)

Exploit source and binary is available at http://www.beavuh.org.

Credit to Liraz Siri for bringing this to our attention.

Hi to eEye/w00w00/teso.

dark spyrit
http://www.beavuh.org - bend over and pray.