RE: [Full-Disclosure] EEYE: Symantec Multiple Firewall TCP Options Denial of Service

Type securityvulns
Reporter Securityvulns
Modified 2004-04-24T00:00:00


On 04/23/2004: eEye Digital Security posted:

eE"Derek Soeder" <> Sent by: 04/23/2004 01:36 PM

Symantec Multiple Firewall TCP Options Denial of Service

Release Date: April 23, 2004

Date Reported: March 9th, 2004

Severity: High (Remote Denial of Service)

Vendor: Symantec


Symantec Security Advisory


20 April, 2004 Symantec Client Firewall Denial of Service Vulnerability

Revision History none

Risk Impact High

Overview 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 Retail: Symantec Norton Internet Security and Professional 2003, 2004 Symantec Norton Personal Firewall 2003, 2004

Corporate: Symantec Client Firewall 5.01, 5.1.1 Symantec Client Security 1.0 and 1.1

Details 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.

CVE 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 (, which standardizes names for security problems.

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

Symantec Product Security Contact: Symantec takes the security and proper functionality of its products very seriously. As founding members in the Organization for Internet Safety, Symantec follows the process of responsible disclosure. Symantec also subscribes to the vulnerability guidelines outlined by the National Infrastructure Advisory Council (NIAC). Please contact if you feel you have discovered a potential or actual security issue with a Symantec product.

Symantec strongly recommends using encrypted email for reporting vulnerability information to The Symantec Product Security PGP key can be obtained here.

A copy of this advisory can be found at

Copyright (c) 2004 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 parts of this alert in any medium other than electronically requires permission from

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.

Symantec, Symantec products, and SymSecurity are registered trademarks of Symantec Corp. 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.