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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:    
http://securityresponse.symantec.com/avcenter/security/Content/2007.07.11d.html
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=554

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

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Symantec AntiVirus symtdi.sys Local Privilege Escalation Vulnerability

iDefense Security Advisory 07.11.07
http://labs.idefense.com/intelligence/vulnerabilities/
Jul 11, 2007

I. 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/

II. 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.

III. 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.

IV. 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.

V. WORKAROUND

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

VI. 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

VII. 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.

VIII. DISCLOSURE TIMELINE

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

IX. CREDIT

This vulnerability was reported to iDefense by Zohiartze Herce.

Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php

Free tools, research and upcoming events
http://labs.idefense.com/

X. LEGAL NOTICES

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 customerservice@idefense.com 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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        http://www.auscert.org.au/render.html?cid=1980

If you believe that your computer system has been compromised or attacked in 
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Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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