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                                   CERT-Renater

                        Note d'Information No. 2008/VULN562
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DATE                      : 09/12/2008

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Systems running Linksys WVC54GC
                              NetCamPlayerWeb11gv2 ActiveX control.

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http://www.kb.cert.org/vuls/id/639345
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Vulnerability Note VU#639345

Linksys WVC54GC NetCamPlayerWeb11gv2 ActiveX control stack buffer
overflow

Overview
The Linksys WVC54GC NetCamPlayerWeb11gv2 ActiveX control contains a
stack buffer overflow, which may allow a remote, unauthenticated
attacker to execute arbitrary code on a vulnerable system.

I. Description
The Linksys WVC54GC wireless video camera provides an ActiveX control
called NetCamPlayerWeb11gv2, which is provided by the file
NetCamPlayerWeb11gv2.ocx. This ActiveX control contains a stack buffer
overflow in the SetSource() method.

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 Internet Explorer (or the program using
the WebBrowser control) to crash.


III. Solution

Apply an update

This vulnerability is addressed in WVC54GC firmware version 1.25.
Please see the release notes for more details. Note that any client
system that has installed the ActiveX control must connect to the
camera and install the updated control.

Disable the NetCamPlayerWeb11gv2 ActiveX control in Internet Explorer

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

      {D7208880-9B7A-43E1-AABB-8C888A5704F9}

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\{D7208880-9B7A-43E1-AABB-8C888A5704F9}]
      "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 Notified	Date Updated
Linksys (A division of Cisco Systems)	Vulnerable	2008-08-15	2008-12-05
References

http://www.cert.org/tech_tips/securing_browser/
http://www.linksys.com/servlet/Satellite?blobcol=urldata&blobheadername1=Content-Type&blobheadername2=Content-Disposition&blobheadervalue1=text%2Fplain&blobheadervalue2=inline%3B+filename%3DWVC54GC-V1.0_non-RoHS-v1.25_fw_ver.txt&blobkey=id&blobtable=MungoBlobs&blobwhere=1193776031728&ssbinary=true&lid=8104724130B17
Credit

Thanks to Andre Protas of eEye for reporting this vulnerability,
who in turn also credits Greg Linares of eEye.

This document was written by Will Dormann.

Other Information

Date Public:	2008-01-03
Date First Published:	2008-12-05
Date Last Updated:	2008-12-05
CERT Advisory:	
CVE-ID(s):	CVE-2008-4391
NVD-ID(s):	CVE-2008-4391
US-CERT Technical Alerts:	
Metric:	2,73
Document Revision:	3

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