Public Vulnerability Reports

Kaspersky Internet Security IOCTL Stack Based Buffer Overflow Vulnerability



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 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 vulnerable.


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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Copyright © 2008 Verisign, Inc.

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