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Category:   Application (Security)  >   Kaspersky Anti-Virus Vendors:   Kaspersky Lab
Kaspersky Anti-Virus IOCTL Stack Overflow Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1020196
SecurityTracker URL:
CVE Reference:   CVE-2008-1518   (Links to External Site)
Date:  Jun 4 2008
Impact:   Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.0, 7.0
Description:   A vulnerability was reported in Kaspersky Anti-Virus. A local user can obtain elevated privileges on the target system.

A local user can supply a specially crafted IOCTL command to the 'kl1.sys' kernel driver to trigger a stack overflow to execute arbitrary code on the target system with kernel level privileges.

IOCTL 0x800520e8 is affected.

The vendor was notified on March 19, 2008.

Tobias Klein reported this vulnerability via iDefense.

Impact:   A local user can obtain elevated privileges on the target system.
Solution:   The vendor has issued a fix, available via automatic update.

The vendor's 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 06.04.08: Kaspersky Internet Security

iDefense Security Advisory 06.04.08
Jun 04, 2008


aspersky 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 stack-based buffer overflow in Kaspersky Lab's
Internet Security could allow an attacker to execute arbitrary code in
the context of the kernel.

The kl1.sys kernel driver distributed with Internet Security contains a
stack-based buffer overflow in the handling of IOCTL 0x800520e8. This
issue is caused by a failure to properly perform bounds checks on
user-supplied data that is passed to the swprintf function as a source
buffer. The destination buffer in this case is a 2,000 element
wide-character array. If the source buffer exceeds 2,000 characters, a
buffer overflow will occur leading to the execution of arbitrary code.


Exploitation of this issue allows an attacker to execute arbitrary code
within the kernel. An attacker would need local access to a vulnerable
computer to exploit this vulnerability.


Kasperky Lab's Internet Security version is confirmed to be
vulnerable to this issue. Previous versions are also suspected to be


iDefense is unaware of any workaround for this issue.


Kaspersky Lab has addressed this vulnerability by releasing updated
anti-virus definition databases. For more information, refer the their
article at the following URL.


The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2008-1518 to this issue. This is a candidate for inclusion in
the CVE list (, which standardizes names for
security problems.


03/19/2008  Initial vendor notification
03/20/2008  Initial vendor response
06/04/2008  Coordinated public disclosure


This vulnerability was reported to iDefense by Tobias Klein.

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