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Zone Labs Security Advisory Severity: High

Microsoft Workstation Service Vulnerability

Overview: A new vulnerability in the Microsoft Workstation Service has been recently discovered. The vulnerability allows an attacker run arbitrary code or to access the target system. Working exploit programs are known to exist. Zone Labs products prevent this vulnerability from being exploited from un-trusted networks by default.

Date Published: November 20, 2003
Last Update: November 20, 2003

Impact: By exploiting the vulnerability, remote attackers are able to compromise the entire system. Known exploit programs are designed to provide command line access to the target system. It may be possible for a worm or Trojan horse program to infect a machine via this vulnerability.

Description: A security vulnerability exists in the Workstation service that could allow remote code execution on an affected system. This vulnerability results because of an unchecked buffer in the Workstation service.

Working exploit programs are known to exist are easily available. It is believed that this vulnerability is being actively exploited.

Affected Software: The following Microsoft Windows versions are vulnerable to this issue:

  • Microsoft Windows 2000
  • Microsoft Windows XP

Zone Labs Products: All computers employing ZoneAlarm® Pro, ZoneAlarm Plus, and ZoneAlarm security products prevent these vulnerabilities from being exploited from un-trusted networks by default.

Recommended Actions: Install any Zone Labs firewall product and ensure that the Security Setting is set to Medium (the default setting) or High. Zone Labs products, by default, prevent connections from un-trusted networks to the ports used to exploit the Workstation service vulnerability.

  • Windows 2000 users: Install Microsoft Security Update MS03-049
  • Windows XP users: Install Microsoft Security Update MS03-043

Related Resources:

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

Copyright: ©1999-2006 by Zone Labs LLC
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.

Disclaimer: 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.


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