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Kaspersky AntiVirus SysInfo ActiveX Control Information Disclosure Vulnerability



Kaspersky AntiVirus offers comprehensive protection from computer viruses and malware threats. More information can be found on the vendors site at the following URL.



Remote exploitation of a information disclosure vulnerability in Kaspersky AntiVirus 6 could allow malicious websites to steal files off of a user's machine.

The vulnerability specifically lays with in the following ActiveX Control:

 ProgID: KL.SysInfo Clsid: BA61606B-258C-4021-AD27-E07A3F3B91DB File: C:Program FilesKaspersky LabKaspersky Anti-Virus 6.0AxKLSysInfo.dll Version: 

This control includes a method called "StartUploading" which allows malicious web scripts to perform an anonymous FTP transfer of any file they specify off of the victims machine.


Exploitation of this vulnerability allows attackers to steal files from a victim's computer.

This vulnerability can be triggered by a malicious website. Users would be required to have a vulnerable version of the target software installed and be lured to a malicious site.

No dialogs, warnings or user action is required to perform the transfer.


iDefense has confirmed the existence of this vulnerability in version 6.0 of Kaspersky AntiVirus.


Setting the kill-bit for the target ActiveX control will prevent exploitation via Internet Explorer.


Kaspersky has addressed this vulnerability by removing the vulnerable libraries upon installation of Maintenance Pack 2. More information is available from the vendor's advisory at the following URL.



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


12/12/2006 Initial vendor notification
12/12/2006 Initial vendor response
04/04/2007 Coordinated public disclosure


This vulnerability was reported to iDefense by Peter Vreugdenhil.

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Copyright © 2007 Verisign, Inc.

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