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Message-ID: <EE499D69B3D0714590B6FE9762B0461104BD3C3703@emb01.unity.local>
Date: Wed, 9 Jun 2010 16:58:57 -0500
From: ZDI Disclosures <zdi-disclosures@...pingpoint.com>
To: "'full-disclosure@...ts.grok.org.uk'" <full-disclosure@...ts.grok.org.uk>, 
	"'bugtraq@...urityfocus.com'" <bugtraq@...urityfocus.com>
Subject: TPTI-10-03: Sophos Anti-Virus SAVOnAccessFilter
 Local Privilege Escalation Vulnerability

TPTI-10-03: Sophos Anti-Virus SAVOnAccessFilter Local Privilege Escalation Vulnerability
http://dvlabs.tippingpoint.com/advisory/TPTI-10-03
June 9, 2010

-- Affected Vendors:
Sophos

-- Affected Products:
Sophos Sophos Anti-Virus

-- Vulnerability Details:
This vulnerability allows local attackers to execute arbitrary code in
kernel space on vulnerable installations of Sophos Anti-Virus. Local
access to the system is required to leverage the vulnerability.

The specific flaw exists in the handling of the system call
NtQueryAttributesFile by the filter driver savonaccessfilter.sys. Due to
improper handling of parameters to the function pool corruption can
occur in kernel space. A local attacker can leverage this to execute
arbitrary code in ring 0.

-- Vendor Response:
Sophos has issued an update to correct this vulnerability. More
details can be found at:

http://www.sophos.com/support/knowledgebase/article/111126.html

-- Disclosure Timeline:
2009-04-15 - Vulnerability reported to vendor
2010-06-09 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Cody Pierce, TippingPoint DVLabs
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