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AUSCERT External Security Bulletin Redistribution
ESB-2008.0433 -- [Win]
Microsoft HeartbeatCtl ActiveX control buffer overflow
30 April 2008
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AusCERT Security Bulletin Summary
---------------------------------
Product: HeartbeatCtl ActiveX control
Publisher: US-CERT
Operating System: Windows
Impact: Execute Arbitrary Code/Commands
Access: Remote/Unauthenticated
CVE Names: CVE-2007-6255
Original Bulletin: http://www.kb.cert.org/vuls/id/570089
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Vulnerability Note VU#570089
Microsoft HeartbeatCtl ActiveX control buffer overflow
Overview
The Microsoft HeartbeatCtl 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 HeartbeatCtl ActiveX control is used to play multiplayer games
on the MSN Games website. The HeartbeatCtl ActiveX control contains a buffer
overflow in the handling of the "Host" parameter.
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
Apply an update
This issue is addressed in Microsoft Security Bulletin MS07-069. This update
sets the kill bit for several unsupported versions of the HeartbeatCtl
ActiveX control.
Disable the HeartbeatCtl ActiveX control in Internet Explorer
The vulnerable ActiveX control can be disabled in Internet Explorer by setting
the kill bit for the following CLSID:
{E5D419D6-A846-4514-9FAD-97E826C84822}
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\{E5D419D6-A846-4514-9FAD-97E826C84822}]
"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
Microsoft Corporation Vulnerable 21-Apr-2008
References
http://www.cert.org/tech_tips/securing_browser/
http://www.microsoft.com/technet/security/bulletin/ms07-069.mspx
http://support.microsoft.com/kb/240797
Credit
This vulnerability was reported by Will Dormann of the CERT/CC.
This document was written by Will Dormann.
Other Information
Date Public 11/12/2007
Date First Published 21/04/2008 05:29:07 PM
Date Last Updated 21/04/2008
CERT Advisory
CVE Name CVE-2007-6255
US-CERT Technical Alerts
Metric 3.90
Document Revision 6
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