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Category:   OS (Microsoft)  >   Windows DLL (Any) Vendors:   Microsoft
Microsoft Windows XP 'i2omgmt.sys' Input Validation Flaw Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1020006
SecurityTracker URL:
CVE Reference:   CVE-2008-0322   (Links to External Site)
Date:  May 12 2008
Impact:   Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): XP SP2 and prior service packs
Description:   A vulnerability was reported in Windows XP. A local user can obtain kernel level privileges on the target system.

A local user can access the \\.\I2OExc interface of the Intelligent Input/Output (I2O) Utility Filter driver (i2omgmt.sys) and supply a specially crafted DeviceObject pointer value to execute arbitrary code on the target system with kernel privileges.

The vendor was notified on March 20, 2007.

Ruben Santamarta of reported this vulnerability via iDefense.

Impact:   A local user can obtain kernel level privileges on the target system.
Solution:   Microsoft has issued a fix (XP SP3).

The Microsoft advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Access control error

Message History:   None.

 Source Message Contents

Subject:  iDefense Security Advisory 05.12.08: Microsoft Windows I2O Filter

iDefense Security Advisory 05.12.08
May 12, 2008


Intelligent Input/Output (I2O) is a defunct computer input/output (I/O)
specification. i2omgmt.sys is a Windows driver for the I2O Utility
Filter. For more background information about I2O, see following


Local exploitation of an input validation vulnerability within version
5.1.2600.2180 of i2omgmt.sys, as included with Microsoft Corp's Windows
XP operating system, could allow an attacker to execute arbitrary code
in the context of the kernel.

This vulnerability specifically exists due to insecure permissions on
the \\.\I2OExc device interface. The permissions on this device allow
"Everyone" write access. This could allow a locally logged-in user to
access functionality designed for privileged use only.

Additionally, the IOCTL handlers for this device interface do not
properly validate user-mode buffer passed to them, so an attacker can
supply a fake DeviceObject pointer to a user-mode address. As such, it
is possible to overwrite arbitrary memory or execute attacker-supplied
code in the context of the kernel.


Exploitation allows an attacker to elevate privileges by overwriting
arbitrary system memory or executing code within kernel context. An
attacker needs to log-in to the target machine to exploit this

This driver is related to I2O protocol and RAID devices. It is not
present by default on every Windows installation. However, iDefense
found this driver loaded on several systems we tested.


iDefense has confirmed the existence of this vulnerability in
i2omgmt.sys version 5.1.2600.2180 as installed on some Windows XP SP2
systems. All other Windows releases with this driver, including
previous versions, are suspected to be vulnerable.


Removing write permissions for "Everyone" appears to prevent access to
the vulnerable code. Although no side effects were witnessed in lab
tests, normal functionality may be hindered.


Microsoft has addressed this issue within Windows XP Service Pack 3. To
obtain Microsoft XP Service Pack 3, visit the following URL.


The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2008-0322 to this issue. This is a candidate for inclusion in
the CVE list (, which standardizes names for
security problems.


03/20/2007  Initial vendor notification
03/20/2007  Initial vendor response
05/12/2008  Coordinated public disclosure


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