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ESB-2007.0520 -- [Win] -- Symantec AntiVirus symtdi.sys Local Privilege Escalation Vulnerability

Date: 17 July 2007

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             AUSCERT External Security Bulletin Redistribution

                          ESB-2007.0520 -- [Win]
  Symantec AntiVirus symtdi.sys Local Privilege Escalation Vulnerability
                               17 July 2007


        AusCERT Security Bulletin Summary

Product:              Symantec AntiVirus
Publisher:            iDefense
Operating System:     Windows
Impact:               Administrator Compromise
Access:               Existing Account
CVE Names:            CVE-2007-3673

Original Bulletin:

Revision History:  July 17 2007: Added Symantec Bulletin
                   July 12 2007: Initial Release

- --------------------------BEGIN INCLUDED TEXT--------------------

Symantec AntiVirus symtdi.sys Local Privilege Escalation Vulnerability

iDefense Security Advisory 07.11.07
Jul 11, 2007


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.


Local exploitation of an input validation vulnerability in version 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.


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.


iDefense confirmed this vulnerability in version 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.


iDefense is currently unaware of any effective workaround for this


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.


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 (, which standardizes names for
security problems.


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


This vulnerability was reported to iDefense by Zohiartze Herce.

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Copyright © 2007 iDefense, Inc.

Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDefense. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically,
please e-mail for permission.

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.

- --------------------------END INCLUDED TEXT--------------------

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