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                                    CERT-Renater

                         Note d'Information No. 2008/VULN196
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DATE                      : 02/06/2008

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Systems running Creative Software AutoUpdate
                                                Engine ActiveX.

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http://www.kb.cert.org/vuls/id/501843
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Vulnerability Note VU#501843

Creative Software AutoUpdate Engine ActiveX stack buffer overflow

Overview

The Creative Labs AutoUpdate Engine ActiveX control contains a stack buffer
overflow, which can allow a remote, unauthenticated attacker to execute
arbitrary code on a vulnerable system.

I. Description

The Creative Software AutoUpdate Engine ActiveX control is a component that
provides automatic update capabilities to Creative Labs software. This
ActiveX control is provided by the file CTSUEng.ocx. The Create Software
AutoUpdate Engine ActiveX control is marked Safe For Scripting and Safe For
Initialization, which means that a web page in Internet Explorer has the
ability to interact with the control. This ActiveX control contains a stack
buffer overflow in the CacheFolder property.

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.

III. Solution

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

Disable the Creative Software AutoUpdate ActiveX control in Internet
Explorer

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

       {0A5FD7C5-A45C-49FC-ADB5-9952547D5715}

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_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX 
Compatibility\{0A5FD7C5-A45C-49FC-ADB5-9952547D5715}]
       "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
Creative Labs 	Vulnerable 	26-May-2008

References

http://www.cert.org/tech_tips/securing_browser/
http://support.microsoft.com/kb/240797

Credit

Thanks to Greg Linares of eEye Digital Security for reporting this
vulnerability.

This document was written by Will Dormann.
Other Information
Date Public 	05/27/2008
Date First Published 	05/27/2008 11:04:12 AM
Date Last Updated 	05/28/2008
CERT Advisory 	
CVE Name 	CVE-2008-0955
US-CERT Technical Alerts 	
Metric 	9.87
Document Revision 	16

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