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<HEAD><TITLE>Internet Explorer Bug</TITLE></HEAD>
<BODY BGCOLOR=BLACK VLINK=BLUE LINK=BLUE>
<TABLE WIDTH=580><TR><TD>
<FONT COLOR=WHITE>
<I>Cybersnot Industries</I><BR>
<FONT COLOR=RED SIZE=5><B>Internet Explorer Bug</B></FONT><BR>
<HR>
<BR>
<BR>
<FONT COLOR=RED><B>Internet Explorer Bug 2/27/97 (Version 3.0 (4.70.1155))</B></FONT><BR>
Microsoft Internet Explorer v3.01 (and earlier?) has a serious
bug which allows web page writers to use ".LNK" and ".URL" files
to run programs on a remote computer. This bug is particularly damaging
because it uses NO ActiveX, and works even when Internet Explorer is set
to its highest security level. It was tested on Microsoft Internet Explorer
Version 3.0 (4.70.1155) running Windows 95. This demo assumes that Windows
is installed in "C:\WINDOWS". Windows 95 DOES NOT PROMPT BEFORE EXECUTING
THESE FILES.
<P>
.URL files are WORSE than .LNK files because .URLs work in both Windows 95 and
Windows NT 4.0 (.LNK's only work in Windows 95). .URL files present a possibly
greater danger because they can be easily created by server side scripts to meet
the specific settings of a user's system. We will provide .URL files for
execution in the next day or so.
<P>
The "shortcuts" can be set to be minimized during execution which means that users may
not even be aware that a program has been started. Microsoft's implementation of
shortcuts becomes a serious concern if a webpage can tell Internet Explorer to refresh
to an executable. Or worse, client side scripts (Java, JavaScript, or VBScript) can
use the Explorer object to transfer a BATCH file to the target machine and then META
REFRESH to that BATCH file to execute the rogue command in that file.
<P>
The following table outlines which areas and users each shortcut type effects:<BR>
<CENTER>
<TABLE WIDTH=400 BORDER=1>
<TR>
<TD><FONT COLOR=WHITE>File Type</FONT></TD>
<TD><FONT COLOR=WHITE>Windows 95</FONT></TD>
<TD><FONT COLOR=WHITE>Windows NT</FONT></TD>
<TD><FONT COLOR=WHITE>Execute Apps</FONT></TD>
<TD><FONT COLOR=WHITE>Command Line Args Allowed</FONT></TD>
<TD><FONT COLOR=WHITE>Searches Path</FONT></TD>
</TR>
<TR>
<TD><FONT COLOR=WHITE>.LNK</FONT></TD>
<TD><FONT COLOR=WHITE>Yes</FONT></TD>
<TD><FONT COLOR=WHITE>No</FONT></TD>
<TD><FONT COLOR=WHITE>Yes</FONT></TD>
<TD><FONT COLOR=WHITE>Yes</FONT></TD>
<TD><FONT COLOR=WHITE>No</FONT></TD>
</TR>
<TR>
<TD><FONT COLOR=WHITE>.URL</FONT></TD>
<TD><FONT COLOR=WHITE>Yes</FONT></TD>
<TD><FONT COLOR=WHITE>Yes</FONT></TD>
<TD><FONT COLOR=WHITE>Yes</FONT></TD>
<TD><FONT COLOR=WHITE>No</FONT></TD>
<TD><FONT COLOR=WHITE>Yes</FONT></TD>
</TR>
</TABLE>
<FONT SIZE=2>Security Comparision .URL vs .LNK</FONT>
</CENTER>
<P>
Naturally, the files must exist on the remote machine to be
properly executed. But, Windows 95 comes with a variety of potentially
damaging programs which can easily be executed. The following link will
start the standard calculator which comes with Windows 95.
<P>
<A HREF="calculator.lnk">Windows Calculator (.lnk)</A>.<BR>
<A HREF="calcnt.url">Windows Calculator (.url)</A>.
<P>
This bug can be used to wreak havoc on a remote user's machine. The
following links will create and delete some directories.
<P>
<A HREF="mkdir.lnk">Create a directory "C:\HAHAHA"</A>.<BR>
<A HREF="explorer.lnk">Open "C:\HAHAHA"</A><BR>
<A HREF="rmdir.lnk">Remove the directory "C:\HAHAHA"</A><BR>
<P>
The META REFRESH tag can be used to execute multiple commands in sequence.
<P>
<BR>
<HR>
<FONT SIZE=2>
<FONT COLOR=RED><B>Internet Explorer Bug</B></FONT><BR>
Discovered By <A HREF="mailto:shoggothe@cybersnot.com">Paul Greene</A><BR>
Page and Examples by <A HREF="mailto:geo@cybersnot.com">Geoffrey Elliott</A>
& <A HREF="mailto:bmorin@cybersnot.com">Brian Morin</A><BR>
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