Hi,
This is actually a 3 years old vulnerability.
It can also be used to open any type of file (with .exe extension) using its
external application, instead of opening it with the associated browser
plug-in (if exists).
E.g. I've been able to use this old vuln to automate the PDF attack vector
found by GNUCitizen's pdp.
More info: http://aviv.raffon.net/2007/10/15/BackFromTheDead.aspx
--Aviv.
-----Original Message-----
From: laurent.gaffie_at_gmail.com [mailto:laurent.gaffie_at_gmail.com]
Sent: Friday, October 12, 2007 10:34 PM
To: bugtraq_at_securityfocus.com
Subject: playing for fun with <=IE7
playing for fun with <=IE7
Impact: who knows ...
Fix Available: no
-------------------------------------------------------
1) Bug
2) Proof of concept
3)Conclusion
======
1) Bug
======
it's possible to bypass the extension filter of <=IE7 this can result by
downloading
an arbitrary exe file
=====
2)proof of concept
=====
let's take this exemple :
http://dams083.free.fr/tmp/putty.exe
this is simply putty .
you click on this and then you will be prompted for downloading the file.
but what about if we do :
http://dams083.free.fr/tmp/putty.exe?1.txt
... the .exe is showed.
now let's go a bit ahead :
http://dams083.free.fr/tmp/putty.exe?1.cda
wow my .exe is downloaded directly and located in temporary files ( and
"""opened""" by windows media player).
works with theses extension :
.log
.dif
.sol
.htt
.itpc
.itms
.dvr-ms
.dib
.asf
.tif
etc ...
=====
5) Conclusion
=====
this is very funny , because actually it only works for .exe extensions.
.COM , .PIF , etc you CANT do this. ( overwrite the extension , and then
bypass the filter)
i guess we can wonder what the heck.
regards laurent gaffié
Received on Oct 16 2007
Intro
