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Category:   Application (Security)  >   Kaspersky Internet Security Vendors:   Kaspersky Lab
Kaspersky Internet Security Heap Overflow in 'klif.sys' Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1017872
SecurityTracker URL:
CVE Reference:   CVE-2007-1880   (Links to External Site)
Updated:  May 16 2008
Original Entry Date:  Apr 5 2007
Impact:   Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.0 prior to
Description:   A vulnerability was reported in Kaspersky Internet Security. A local user can obtain elevated privileges on the target system.

A local user can trigger an integer overflow in 'klif.sys' to execute arbitrary code on the target system with kernel-level privileges.

The _NtSetValueKey() function is affected.

The vendor was notified on January 24, 2007.

iDefense reported this vulnerability.

Impact:   A local user can obtain kernel level privileges on the target system.
Solution:   The vendor has issued a fixed version (Maintenance Pack 2.0, build

The Kaspersky advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Boundary error
Underlying OS:  Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  iDefense Security Advisory 04.04.07: Kaspersky Internet Security

Kaspersky Internet Security Suite klif.sys Heap Overflow Vulnerability

iDefense Security Advisory 04.03.07
Apr 03, 2007


Kaspersky Internet Security Suite is a combination of Kaspersky
anti-virus, anti-spam, and personal firewall in one product. For more
information see the vendor's website at the following URL.


Local exploitation of a heap overflow vulnerability in Kaspersky Lab's
Internet Security Suite klif.sys could allow an attacker to execute
arbitrary code within kernel context.

The klif.sys driver is part of the "anti-hacker" proactive protection.
As part of this defense, the driver hooks and screens various system
calls, such as registry functions.

The hook function for the _NtSetValueKey() function is vulnerable to an
integer overflow that leads to a kernel heap overflow. Passing a large
unsigned value for the data size argument results in an arithmetic
overflow when calculating the amount of memory to allocate. A copy
operation into this buffer results in corruption of kernel memory.


Exploitation allows an attacker to execute code with kernel privileges.

This vulnerability lets an attacker overwrite a nearly arbitrary amount
of kernel heap memory with arbitrary data. Exploitation of kernel heap
based buffer overflows is both difficult and unreliable. However, there
are documented methods for exploiting these types of overflows.


iDefense confirmed this vulnerability in Kaspersky Internet Security for Windows. Previous versions may also be affected.


iDefense is currently unaware of any workarounds for this issue.


Kaspersky has addressed this vulnerability within Maintenance Pack 2.
More information is available from the vendor's advisory at the
following URLs.


A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
been assigned yet.


01/24/2007  Initial vendor notification
03/02/2007  Second vendor notification
03/05/2007  Initial vendor response
04/03/2007  Coordinated public disclosure


The discoverer of this vulnerability wishes to remain anonymous.

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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
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 There are no warranties with regard to this information. Neither the
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