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TITLE:
Symantec Norton Personal Firewall Denial of Service

SECUNIA ADVISORY ID:
SA21938

VERIFY ADVISORY:
http://secunia.com/advisories/21938/

CRITICAL:
Not critical

IMPACT:
DoS

WHERE:
Local system

SOFTWARE:
Symantec Norton Personal Firewall 2005
http://secunia.com/product/6637/
Symantec Norton Personal Firewall 2006
http://secunia.com/product/6638/

DESCRIPTION:
David Matousek has discovered a vulnerability in Symantec Norton
Personal Firewall, which can be exploited by malicious, local users
to cause a Denial of Service.

The vulnerability is caused due to an error in the handling of data
sent to the "\Device\SymEvent" device which is writable by
"Everyone". This can be exploited to crash a vulnerable system by
sending malformed data.

The vulnerability has been confirmed in Symantec Norton Personal
Firewall 2005 versions 8.0.5.14 and 8.0.7.1, and has also been
reported in Symantec Norton Personal Firewall 2006 version 9.1.0.33.
Other versions may also be affected.

SOLUTION:
Grant only trusted users access to affected systems.

PROVIDED AND/OR DISCOVERED BY:
David Matousek

ORIGINAL ADVISORY:
http://www.matousec.com/info/advisories/Norton-Insufficient-validation-of-SymEvent-driver-input-buffer.php

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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