Kaspersky AntiVirus SysInfo ActiveX Control Information Disclosure
Vulnerability

iDefense Security Advisory 04.04.07
http://labs.idefense.com/intelligence/vulnerabilities/
Apr 04, 2007

I. BACKGROUND

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

http://usa.kaspersky-labs.com/products/anti-virus.php

II. DESCRIPTION

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 Files\Kaspersky Lab\Kaspersky Anti-Virus
6.0\AxKLSysInfo.dll
  Version: 5.0.5.0

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.

III. ANALYSIS

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.

IV. DETECTION

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

V. WORKAROUND

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

VI. VENDOR RESPONSE

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.

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

VII. CVE INFORMATION

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

VIII. DISCLOSURE TIMELINE

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

IX. CREDIT

This vulnerability was reported to iDefense by Peter Vreugdenhil.

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X. LEGAL NOTICES

Copyright © 2007 iDefense, Inc.

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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
of the information constitutes acceptance for use in an AS IS condition.
 There are no warranties with regard to this information. Neither the
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indirect, or consequential loss or damage arising from use of, or
reliance on, this information.