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Date: Wed, 18 Feb 2004 16:33:05 -0800
From: "Zone Labs Product Security" <>
To: <>, <>,
Subject: Zone Labs Security Advisory ZL04-08 - SMTP processing vulnerability

Hash: SHA1

Zone Labs Security Advisory ZL04-008
Zone Labs SMTP Processing Vulnerability

Date Published          February 18, 2004
Date Last Revised       February 18, 2004

Severity                Medium


A security vulnerability exists in specific versions of ZoneAlarm,
ZoneAlarm Pro, ZoneAlarm Plus and the Zone Labs Integrity client.
This vulnerability is caused by an unchecked buffer in Simple Mail
Transfer Protocol (SMTP) processing which could lead to a buffer 
overflow. In order to exploit the vulnerability without user 
assistance, the target system must be operating as an SMTP server.
Zone Labs does not recommend using our client security products to 
protect servers. 

Upgrading an affected Zone Labs product will remove this 


If successfully exploited, a skilled attacker could cause the 
firewall to stop processing traffic, execute arbitrary code, or 
elevate malicious code's privileges.

Zone Labs recommends affected users update their software to the 
current versions which address the issue.
Affected Products
    * ZoneAlarm family of products and Integrity client versions 
      4.0 and above

Unaffected Products
    * ZoneAlarm and Integrity client versions earlier than 4.0

Integrity Server and Integrity Clientless Security products are not 


Zone Labs desktop security products process SMTP in order to perform 
various security functions. Due to an unchecked buffer in the SMTP 
processing system, a skilled attacker could cause the firewall to 
stop processing traffic or execute arbitrary code. 

Successful exploitation requires one of the following scenarios and 
applies only to SMTP traffic:

    * A program listening on port 25/TCP (SMTP) of the target system.
      This condition is usually only present on SMTP servers. 
      Zone Labs does not recommend using our client security products
      to protect servers.

    * A malicious program running on the protected system could 
      trigger the buffer overflow and gain SYSTEM privileges if the 
      user or administrator has given it permission to access the 

In all cases, the program requesting network access must be approved
by the user through the Program Control policy.

Recommended Actions

ZoneAlarm, ZoneAlarm Plus, and ZoneAlarm Pro users should upgrade to 
version: 4.5.538.001

To update your Zone Labs client product:

    1. Select Overview | Preferences.

    2. In the Check for Updates area, choose an update option.

    Automatically: Zone Labs security software automatically notifies
    you when an update is available.

    Manually: You monitor the Status tab for updates. To invoke an
    update check immediately, click Check for Update.

Integrity 4.0 users should upgrade to Integrity client version:

Integrity 4.5 users should upgrade to Integrity client version:

Integrity updates are available on the Zone Labs Enterprise Support 
web site.

Related Resources

    * Zone Labs Security Services:


Zone Labs would like to acknowledge eEye Digital Security for
reporting this issue to Zone Labs.


Zone Labs customers who are concerned about this vulnerabilities or
have additional technical questions may reach our Technical Support
group at:  

To report security issues with Zone Labs products contact:


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. Zone Labs and Zone Labs products, are
registered trademarks of Zone Labs Incorporated and/or affiliated 
companies in the United States and other countries. All other 
registered and unregistered trademarks represented in this document
are the sole property of their respective companies/owners.


2004 Zone Labs, Inc. All rights reserved. Zone Labs, TrueVector, 
ZoneAlarm, and Cooperative Enforcement are registered trademarks of 
Zone Labs, Inc. The Zone Labs logo, Zone Labs Integrity and IMsecure
are trademarks of Zone Labs, Inc. Zone Labs Integrity protected under
U.S. Patent No. 5,987,611. Reg. U.S. Pat. & TM Off. Cooperative 
Enforcement is a service mark of Zone Labs, Inc. All other trademarks
are the property of their respective owners.

Permission to redistribute this alert electronically is granted as
long as it is not edited in any way unless authorized by Zone Labs.
Reprinting the whole or part of this alert in any medium other than
electronically requires permission from Zone Labs.

Version: PGP 8.0.2


Full-Disclosure - We believe in it.

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