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@xxxxxxxxx [mailto:laurent.gaffie@xxxxxxxxx] Sent: Friday, October 12, 2007 10:34 PM To: bugtraq@xxxxxxxxxxxxxxxxx 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 gaffiי
