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                                   CERT-Renater

                        Note d'Information No. 2009/VULN171
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DATE                      : 17/04/2009

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Systems running Microsoft Whale Intelligent
                             Application Gateway Whale Client Components
                              ActiveX control.

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http://www.kb.cert.org/vuls/id/789121
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Vulnerability Note VU#789121

Microsoft Whale Intelligent Application Gateway Whale Client Components
ActiveX control stack buffer overflows


Overview

The Microsoft Whale Intelligent Application Gateway Whale Client
Components ActiveX control contains multiple stack buffer overflows,
which can allow a remote, unauthenticated attacker to execute
arbitrary code on a vulnerable system.


I. Description

Whale Communications Intelligent Application Gateway is an application
that provides SSL VPN functionality. The Whale Client Components, which
is provided by the file WhlMgr.dll, contains stack buffer overflow
vulnerabilities in the CheckForUpdates() and UpdateComponents() methods.
Note that Whale Communications is a subsidiary of Microsoft.


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 the web browser to crash.


III. Solution

Apply an update

This issue is addressed in the Microsoft Intelligent Application
Gateway 3.7 SP2. To verify the version of the installed ActiveX control,
go to %windir%\Downloaded Program Files\ and check the value of the Version
field for Whale Client Components. If the version is less than 3.7, please
utilize the following workarounds:

Disable the Whale Client Components ActiveX control in Internet Explorer

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

      {8D9563A9-8D5F-459B-87F2-BA842255CB9A}

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\{8D9563A9-8D5F-459B-87F2-BA842255CB9A}]
      "Compatibility Flags"=dword:00000400

Please note that setting the kill bit will break the Intelligent
Application Gateway functionality.

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 Notified	Date Updated
Microsoft Corporation	Vulnerable	2006-12-14	2009-04-15


References

http://www.cert.org/tech_tips/securing_browser/#Internet_Explorer
http://technet.microsoft.com/en-us/library/dd282918.aspx
http://support.microsoft.com/kb/240797


Credit

This vulnerability was reported by Will Dormann of CERT/CC.

This document was written by Will Dormann.


Other Information

Date Public:	2009-04-15
Date First Published:	2009-04-15
Date Last Updated:	2009-04-15
CERT Advisory:	
CVE-ID(s):	CVE-2007-2238
NVD-ID(s):	CVE-2007-2238
US-CERT Technical Alerts:	
Metric:	3.41
Document Revision:	13

If you have feedback, comments, or additional information about this vulnerability,
please send us email.

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