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AUSCERT External Security Bulletin Redistribution
ESB-2008.0572 -- [Win]
Creative Software AutoUpdate Engine ActiveX stack buffer overflow
2 June 2008
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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
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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