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Norton AntiSpam contains boundary error within the "SymSpamHelper Class" (symspam.dll) ActiveX component.

Vulnerability Note VU#344718

Original Release Date: 2004-03-25 | Last Revised: 2004-03-25


Symantec's Norton AntiSpam is a software package that provides spam filtering. A vulnerability in an ActiveX control that ships with Norton AntiSpam may permit a remote attacker to execute arbitrary code on the local system.


Symantec Norton AntiSpam for Windows installs the SymSpamHelper Class (symspam.dll), an ActiveX control that is marked safe for scripting. The ActiveX control contains a buffer overflow vulnerability that may be remotely exploited. Using the "LaunchCustomRuleWizard" method an attacker may be able to exploit a buffer overflow in the control to run arbitrary code on the target system.

The victim must open a malicious web page or HTML-formatted email message in order for this vulnerability to be exploited remotely.


An attacker may be able to exploit this vulnerable to execute arbitrary code on the target system with elevated privileges.


According to the Symantec advisory, customers should run Symantec LiveUpdate manually to ensure all installed Symantec products are fully updated.

    • Open any installed Symantec product
    • Click on LiveUpdate in the toolbar
    • Run LiveUpdate until all available Symantec product updates are downloaded and installed

Vendor Information


Symantec Corporation Affected

Updated:  March 24, 2004



Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


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Thanks to NGSSoftware Insight Security Research for reporting this vulnerability.

This document was written by Jason A Rafail and is based on information provided by NGSSoftware Insight Security Research and Symantec.

Other Information

CVE IDs: CVE-2004-0363
Severity Metric: 15.30
Date Public: 2004-03-19
Date First Published: 2004-03-25
Date Last Updated: 2004-03-25 19:50 UTC
Document Revision: 5

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