Vulnerability Note VU#466601

Microsoft DirectX Media 6.0 Live Picture Corporation DirectTransform FlashPix ActiveX control buffer overflow

Overview

The Live Picture Corporation DirectTransform FlashPix ActiveX control contains a buffer overflow, which may allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.

I. Description

The Microsoft DirectX Media 6.0 SDK includes an ActiveX control that is produced by Live Picture Corporation. This control, which is provided by DXTLIPI.DLL, is known as FlashPix. The FlashPix ActiveX control contains a buffer overflow vulnerability in the SourceUrl() property. Because the FlashPix ActiveX control is marked "Safe for Scripting," Internet Explorer can be used as an attack vector for this vulnerability.

Note that software other than the Microsoft DirectX Media 6.0 SDK may include the vulnerable FlashPix ActiveX control. Exploit code for this vulnerability is publicly available.

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 code with the privileges of the user. The attacker could also cause Internet Explorer (or the program using the WebBrowser control) to crash.

III. Solution

We are currently unaware of a practical solution to this problem. Please consider the following workarounds

Disable the FlashPix ActiveX control in Internet Explorer

The vulnerable ActiveX control can be disabled in Internet Explorer by setting the kill bit for the following CLSID:

{201EA564-A6F6-11D1-811D-00C04FB6BD36}

More information about how to set the kill bit is available in Microsoft Support Document 240797. Alternatively, the following text can be saved as a .REG file and imported to set the kill bit for this control:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX Compatibility{201EA564-A6F6-11D1-811D-00C04FB6BD36}]
"Compatibility Flags"=dword:00000400

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.

Systems Affected

Vendor	Status	Date Updated
Live Picture Corporation	Vulnerable	12-Aug-2007
Microsoft Corporation	Vulnerable	12-Aug-2007

References

http://www.cert.org/tech_tips/securing_browser/#Internet_Explorer
http://support.microsoft.com/kb/240797
http://www.microsoft.com/downloads/details.aspx?familyid=9909BA22-8CAA-4241-954C-E7D710E18522
http://secunia.com/advisories/26426/

Credit

This vulnerability was publicly disclosed by Krystian Kloskowski.

This document was written by Will Dormann.

Other Information

Date Public	08/10/2007
Date First Published	08/12/2007 12:35:47 PM
Date Last Updated	08/13/2007
CERT Advisory
CVE Name
Metric	12.91
Document Revision	7