Vulnerability Note VU#512804

Sky Software FileView ActiveX control allows arbitrary command execution via unsafe methods

Overview

The Sky Software FileView ActiveX control contains unsafe methods, which may allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.

I. Description

The Sky Software FileView object is an ActiveX control that is provided with several applications, such as WinZip. This ActiveX control contains several unsafe methods, but is marked "safe for scripting" and "safe for initialization." For example, some of the methods of this ActiveX control allow an attacker to open, copy, delete, or execute arbitrary files on the target computer.

II. Impact

By convincing a user to view a specially crafted HTML document (e.g., a web page or an HTML email message or attachment), an attacker may be able to execute arbitrary commands with the privileges of the user. An attacker may also be able to perform other filesystem activities, such as copying or deleting files.

III. Solution

Apply an update

WinZip 10 users should update to WinZip 10 build 7245. This update provides a version of the FileView control that is not marked "safe for scripting" or "safe for initialization," which means that a web page cannot call the unsafe methods. Versions of WinZip prior to 10 do not appear to contain the vulnerable ActiveX control.

Disable ActiveX

Disabling ActiveX controls in the Internet Zone (or any zone used by an attacker) appears to prevent exploitation of this and other ActiveX vulnerabilities. Instructions for disabling ActiveX in the Internet Zone can be found in the "Securing Your Web Browser" document.�

Disable the FileView object in Internet Explorer

The Sky Software FileView ActiveX controls can be disabled in Internet Explorer by setting the kill bit for the following CLSIDs. Note that this list is not a complete list of the vulnerable controls. Other versions of the FileView ActiveX control may use different CLSIDs.

{0A7A7240-D038-DB9F-B3B1-7FEFFE5F9ED6}

{247D857F-1034-4AA6-BB1A-347D1A3340C8}

{551E5AC9-BDBD-48EC-8AE2-ECAF90C7A214}

{A09AE68F-B14D-43ED-B713-BA413F034904}

More information about how to set the kill bit is available in Microsoft Support Document 240797. Note that Microsoft Security Bulletin MS06-067 sets the kill bit for one of these CLSIDs.

Systems Affected

Vendor	Status	Date Notified	Date Updated
Sky Software	Vulnerable	15-Nov-2006
WinZip Computing, Inc.	Vulnerable	15-Nov-2006

References

http://www.us-cert.gov/reading_room/securing_browser/#Internet_Explorer
http://www.zerodayinitiative.com/advisories/ZDI-06-040.html
http://www.winzip.com/wz7245.htm
http://secunia.com/advisories/22891/
http://www.securityfocus.com/bid/21060

Credit

This vulnerability was disclosed by TippingPoint ZDI.

This document was written by Will Dormann.

Other Information

Date Public:	2006-11-14
Date First Published:	2006-11-15
Date Last Updated:	2007-03-09
CERT Advisory:
CVE-ID(s):	CVE-2006-5198
NVD-ID(s):	CVE-2006-5198
US-CERT Technical Alerts:
Metric:	19.56
Document Revision:	8

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Produced 2006 by US-CERT, a government organization
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