Re: File extensions spoofable in MSIE download dialog

From: cube (chefat_private)
Date: Tue Dec 04 2001 - 10:11:59 PST

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    > Von: chef [mailto:chefat_private] 
    > Gesendet: Donnerstag, 29. November 2001 19:03
    > 
    > > Von: StatiC [mailto:staticat_private]
    > > Gesendet: Donnerstag, 29. November 2001 03:52
    > > 
    > > I was playing with apache configs a few months ago and
    > > noticed a similar issue with IE5.5.  The procodure below will 
    > > cause IE5.5 to display the open dialog for readme.txt but 
    > > once opened, it executes immediately on IE5.5 sp2 with no 
    > > hint that it is really getting an executable file called 
    > > calc.exe.  I only tested it with IE5.5.
    > 
    > I testet it right now, with IE6; Q312461 / WinXP and i think 
    > there is no problem at all.
    > 
    > First a question for text.txt pops up and when i say "open"
    > a second message with question for save / open pops up.
    > This second popup tells the right name "calc.exe" .
    > Finally when i say "open" it opens the calculator.
    > 
    > For testing: http://www.geilerserver.de/text.txt
    > 
    > > Why does microsoft think it is wise to trust the filename in
    > > the url over what the header content-type is set to for 
    > > display purposes since the content-type seems to take 
    > > priority for what will really happen with the file.
    > 
    > I think that's only a Problem of older Versions.
    
    Hello,
    
    I tryed with Win98 5.5 SP2; Q312461 and can confirm the "Sec. hole"
    
    Only the first "text.txt" dialog pop-up's and if i choose "open" 
    the "calc.exe" will be executed.
    It crashes on win98, becouse it's from XP, but thats another thing.
    
    ^cUbE^
    



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