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
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http://labs.idefense.com/
X. LEGAL NOTICES
Copyright  2007 iDefense, 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.
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