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Sophos Anti-Virus SAVOnAccessFilter Local Privilege Escalation Vulnerability

TPTI-10-03: June 9th, 2010

CVE ID

Affected Vendors

Affected Products

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: