Public Vulnerability Reports

Kaspersky Internet Security Suite klif.sys Heap Overflow Vulnerability

04.04.07

BACKGROUND

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.

http://www.kaspersky.com/

DESCRIPTION

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.

ANALYSIS

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.

DETECTION

iDefense confirmed this vulnerability in Kaspersky Internet Security 6.0.1.411 for Windows. Previous versions may also be affected.

WORKAROUND

iDefense is currently unaware of any workarounds for this issue.

VENDOR RESPONSE

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

http://www.kaspersky.com/technews?id=203038693

http://www.kaspersky.com/technews?id=203038694

CVE INFORMATION

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

DISCLOSURE TIMELINE

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

CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

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

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

LEGAL NOTICES

Copyright © 2007 Verisign, 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 customer service 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.