[NT] ZoneLabs SMTP Processing Buffer Overflow (RCPT TO)

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To: list@securiteam.com
Date: 22 Feb 2004 15:03:59 +0200

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  ZoneLabs SMTP Processing Buffer Overflow (RCPT TO)
------------------------------------------------------------------------

SUMMARY

 <http://www.zonelabs.com> ZoneLabs provides a suite of desktop firewall
products. Products in this suite such as ZoneAlarm analyze incoming and
outgoing email messages for malicious or otherwise abnormal content.
When ZoneAlarm examines outgoing email messages a buffer overflow
condition is presented when the destination email address is retrieved
from the message. An attacker can exploit this vulnerability to elevate
his privileges to SYSTEM on any machine protected by a vulnerable ZoneLabs
product. This vulnerability can also be exploited remotely if an attacker
can manipulate the protected system into sending an outgoing email
message.

DETAILS

A stack based buffer overflow vulnerability within vsmon.exe can be
exploited to execute code with the context of the SYSTEM account. The
vulnerability exists within the component responsible for processing the
RCPT TO command argument. By specifying a large argument to the RCPT TO
command an internal stack based buffer can be overflowed within the
TrueVector Internet Monitor (vsmon.exe) process.

Vendor Status:
ZoneLabs was contacted and within only a few days they produced an update
to eliminate this vulnerability within their products. We would like to
give special recognition to the responsiveness of ZoneLabs in creating a
fix to protect their customers.
A patch for this vulnerability can be found at:
<http://download.zonelabs.com/bin/free/securityAlert/8.html>
http://download.zonelabs.com/bin/free/securityAlert/8.html.

ADDITIONAL INFORMATION

The information has been provided by <mailto:mmaiffret@EEYE.COM> Marc
Maiffret.

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