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September 21, 2005
Symantec Brightmail AntiSpam: winmail.dat File, Denial of Service

Revision History

Risk Impact

Remote AccessYes (incoming mail)
Local AccessNo
Authentication RequiredNo
Exploit publicly availableNA

A potential Denial of Service issue has been identified and fixed in the Symantec Brightmail AntiSpam product. This issue occurs only when processing specific malformed winmail.dat files on RedHat Linux systems.

Affected Supported Products

Symantec Brightmail AntiSpam6.01RedHat LinuxUpdate
Symantec Brightmail AntiSpam6.02RedHat LinuxUpdate
Symantec Mail Security 8200 Series ApplianceAllAllNAAutomatic Update available (build 4.1.0-58)

Note: Customers with product versions prior to 6.0.1 are encouraged to upgrade to the latest product version.

Non-Affected Products

Symantec Brightmail AntiSpamWin32AllAll
Symantec Brightmail AntiSpamWin32AllAll

Symantec Response
An update for Symantec Brightmail AntiSpam Versions 6.0.1 and 6.0.2 on RedHat Linux has been released and can be downloaded from the following location:


An update for the Symantec Mail Security 8200 Series Appliance is available through its software update feature.

Symantec is not aware of any active attempts against or customers impacted by this issue.

As a part of normal best practices, users should keep vendor-supplied patches for all application software and operating systems up-to-date. Symantec strongly recommends any affected customers update their product immediately to protect against these types of threats.

Symantec takes the security and proper functionality of our products very seriously. As founding members of the Organization for Internet Safety (OISafety), Symantec supports and follows the principles of responsible disclosure. Symantec also subscribes to the vulnerability disclosure guidelines outlined by the National Infrastructure Advisory Council (NIAC).

Please contact secure@symantec.com if you feel you have discovered a security issue in a Symantec product. A Symantec Product Security team member will contact you regarding your submission. Symantec strongly recommends using encrypted email for reporting vulnerability information to secure@symantec.com. The Symantec Product Security PGP key can be found at the end of this message.

Symantec has developed a Product Vulnerability Response document outlining the process we follow in addressing suspected vulnerabilities in our products. This document is available below.

PDF Symantec Vulnerability Response Policy PGP Symantec Product Vulnerability Management PGP Key

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Permission to redistribute this alert electronically is granted as long as it is not edited in any way unless authorized by Symantec Security Response. Reprinting the whole or part of this alert in any medium other than electronically requires permission from secure@symantec.com.

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.

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Initial Post on: Wednesday, 21-Sep-05 18:00:00
Last modified on: Wednesday, 21-Sep-05 18:44:04