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             AUSCERT External Security Bulletin Redistribution

                          ESB-2008.0572 -- [Win]
     Creative Software AutoUpdate Engine ActiveX stack buffer overflow
                                2 June 2008


        AusCERT Security Bulletin Summary

Product:              Creative Software AutoUpdate
Publisher:            US-CERT
Operating System:     Windows
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated

Original Bulletin:    http://www.kb.cert.org/vuls/id/501843

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Vulnerability Note VU#501843

Creative Software AutoUpdate Engine ActiveX stack buffer overflow


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 

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


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




Thanks to Greg Linares of eEye Digital Security for reporting this 

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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