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
Local exploitation of an input validation vulnerability in version
220.127.116.11 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 18.104.22.168 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
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.
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
VIII. DISCLOSURE TIMELINE
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 =C2=A9 2007 iDefense, Inc.
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