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April 20, 2004
Symantec Client Firewall Denial of Service Vulnerability

Revision History

Risk Impact

eEye Digital Security notified Symantec Corporation of a severe Denial of Service vulnerability they discovered in the Symantec Client Firewall products for Windows. By properly exploiting this issue, an attacker could render the targeted system inoperable.

Affected Components
Symantec Norton Internet Security and Professional 2003, 2004
Symantec Norton Personal Firewall 2003, 2004
Symantec Client Firewall 5.01, 5.1.1
Symantec Client Security 1.0 and 1.1

eEye Digital Security notified Symantec of a Denial of Service vulnerability they found during product testing against Symantec's client firewall applications. By directing a specifically formatted TCP attack against a target system running a vulnerable Symantec application, an attacker can cause a complete system halt. As a result, the targeted system would require a system reboot to clear the problem.

Symantec Response
Symantec confirmed the vulnerability reported by eEye Digital Security. Symantec product engineers have developed fixes for the issue and released patches for all impacted products through Symantec LiveUpdate and technical support channels.

Clients using retail versions of Symantec Norton Internet Security and Symantec Norton Personal Firewall who regularly run Symantec LiveUpdate should already be protected against this issue. However, to be sure they are fully protected, customers should run Symantec LiveUpdate manually to ensure all available updates are installed.

  • Open any installed Symantec product
  • Click on LiveUpdate in the toolbar
  • Run LiveUpdate until Symantec LiveUpdate indicated that all installed Symantec products are up-to-date

Clients running corporate versions of Symantec Client Firewall or Symantec Client Security should download and apply patches obtained through their appropriate support channels.

Symantec is not aware of any active attempts against or customer impact from this issue.

The Common Vulnerabilities and Exposures (CVE) initiative has assigned Candidate CAN-2004-0375 to this issue.

This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems.

Symantec appreciates the cooperation of the eEye Digital Security research team in identifying this issue.

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

Copyright © by Symantec Corp.
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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Last modified on: Monday, 25-Oct-2004 15:27:53 PDT