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Category:   Application (Security)  >   Sophos Anti-Virus Vendors:   Sophos
Sophos Anti-Virus 'savonaccessfilter.sys' Error Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1024089
SecurityTracker URL:
CVE Reference:   CVE-2010-2308   (Links to External Site)
Updated:  Jun 18 2010
Original Entry Date:  Jun 11 2010
Impact:   Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 7.6.20
Description:   A vulnerability was reported in Sophos Anti-Virus. A local user can obtain elevated privileges on the target system.

A local user can invoke a specially crafted NtQueryAttributesFile() system call to trigger an error in the 'savonaccessfilter.sys' driver and execute arbitrary code on the target system with kernel level privileges.

The vendor was notified on April 15, 2009.

Cody Pierce of TippingPoint DVLabs reported this vulnerability.

Impact:   A local user can obtain kernel level privileges on the target system.
Solution:   The vendor has issued a fix (7.6.20, 9).

The vendor's advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Access control error
Underlying OS:  Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  TPTI-10-03: Sophos Anti-Virus SAVOnAccessFilter Local Privilege Escalation Vulnerability

TPTI-10-03: Sophos Anti-Virus SAVOnAccessFilter Local Privilege Escalation Vulnerability
June 9, 2010

-- Affected Vendors:

-- 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:

-- 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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