Denial of Service in Symantec Norton AntiVirus AutoProtect

Symantec responded to two denial of service (DoS) issues identified in the AutoProtect functionality of the Symantec Norton AntiVirus consumer product. The Information-Technology Promotion Agency-Japan, IPA, reported one situation where a real time scan of a specific file type can cause a system crash, Blue Screen of Death (BSOD), with both Symantec Norton AntiVirus 2004 and 2005 Windows applications. This type of file, while not malicious on it’s own, could be maliciously introduced either remotely from outside the system through email or over http, or internally by an authorized user to disrupt service on a targeted system.

Scanning specific file modifications using the “SmartScan” feature of AutoProtect in the Symantec Norton AntiVirus 2005 application can cause the other DoS issue reported by the Japan Computer Emergency Response team, JPCERT. Any malicious use of this DoS would require authorized access to the targeted system to implement.

Affected Products
Symantec Norton AntiVirus 2004
Symantec Norton Internet Security 2004 (Professional)
Symantec Norton System Works 2004 (Professional)
Symantec Norton AntiVirus 2005
Symantec Norton Internet Security 2005
Symantec Norton System Works 2005 (Premier)

Symantec Response
Symantec product engineers confirmed both issues impacting Symantec’s Auto-Protect feature in Symantec Norton AntiVirus and have developed and released a patch for all impacted products through Symantec LiveUpdate. Customers running Automatic LiveUpdate should already be updated.

To manually update via Symantec LiveUpdate, users should:

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

Symantec is unaware of any adverse customer impact from either of these issues.

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