Great Circle Associates Firewalls
(November 1996)
 

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Subject: ActiveX and RISKS
From: peter @ baileynm . com (Peter da Silva)
Date: Fri, 15 Nov 1996 19:02:52 -0600 (CST)
To: firewalls @ greatcircle . com

This is precisely the ActiveX exploit I predicted would happen. Who's
got a good ActiveX blocker proxy for a firewall?

>From RISKS:
> Date: Mon, 11 Nov 1996 23:49:03 -0500
> From: "Richard M. Smith" <rms @
 pharlap .
 com>
> Subject: Making good ActiveX controls do bad things

>   Even more worrisome are ActiveX controls that contain methods (i.e.,
>   function calls) that write files to disks.  These methods can be used
>   by a simple VBscript program to overwrite key system files like
>   AUTOEXEC.BAT, CONFIG.SYS, REG.DAT etc.  The damage is done simply by
>   viewing an HTML page that contains the ActiveX control and the
>   malicious VBScript code.  I know of at least three commercially
>   available ActiveX controls that have methods that will save files to
>   disk.  Any of these controls, I believe, can be exploited to build a
>   disk crash HTML page.  At least two of these controls have valid
>   Authenticode digital signatures so that they can be automatically
>   downloaded and executed even with the highest security settings in
>   Internet Explorer 3.


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