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Symantec AntiVirus symtdi.sys Local Privilege Escalation Vulnerability

07.11.07

BACKGROUND

Symantec has a wide range of Anti-Virus and Internet Security products that are designed to protect users from viruses and other harmful software. More information can be found on the Symantec site at the following URL.

http://www.symantec.com/

DESCRIPTION

Local exploitation of an input validation vulnerability in version 5.5.1.6 of symtdi.sys allows attackers to elevate privileges to SYSTEM.

The vulnerability specifically exists due to improper address space validation when the \symTDI device driver processes IOCTL 0x83022323. An attacker can overwrite an arbitrary address, including code segments, with a constant double word value by supplying a specially crafted Irp to the IOCTL handler function.

ANALYSIS

Exploitation allows an attacker to obtain elevated privileges by exploiting a kernel-mode driver. This could allow the attacker to gain complete control of the affected system.

Note that since the attacker can only overwrite with a constant double-word value, exploitation is not completely straight forward. However, this does not significantly impact the difficulty of exploitation since code segments can be overwritten within the kernel.

DETECTION

iDefense confirmed this vulnerability in version 5.5.1.6 of Symantec's symtdi.sys device driver as included with version 10 of Symantec AntiVirus Corporate Edition. Previous versions and related products that contain the affected driver are suspected vulnerable.

WORKAROUND

iDefense is currently unaware of any effective workaround for this issue.

VENDOR RESPONSE

Symantec has addressed this vulnerability by releasing updated versions of the SymTDI.sys device driver. The updated driver has been made available via LiveUpdate. For more information consult Symantec's advisory at the following URL.

http://securityresponse.symantec.com/avcenter/security/Content/2007.07.11d.html

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2007-3673 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

DISCLOSURE TIMELINE

01/10/2007 Initial vendor notification
01/11/2007 Initial vendor response
07/11/2007 Coordinated public disclosure

CREDIT

This vulnerability was reported to iDefense by Zohiartze Herce.

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LEGAL NOTICES

Copyright © 2007 Verisign, Inc.

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Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.