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What A Drag! -revisited-
From: "mikx" <mikx () mikx de>
Date: Tue, 24 Aug 2004 13:24:00 +0200

Most people i talked to consider the Internet Explorer drag and drop vulnerability found by http-equiv not as a serious problem, because it requires some user interaction and the press pushes this topic way to much as the "first security problem in SP2". In an article on BetaNews even Microsoft claims it's not a high risk for customers (http://www.betanews.com/article/1093035994).

To proof it's not a "hype" created by the media or companies like secunia, i created another proof-of-concept based on http-equiv's code that hides both the image to drag and the local folder you drop it to. As a result using the window scrollbar will install malware in your startup folder.

A little 5x5 pixel "drop zone" will automaticly follow your mouse. Just drag the window scrollbar as usual (and a hidden image at the same moment) and whereever you release the mouse button you will drop an exe file to your shell:startup (as long as you remain inside the browser window of course).

Demo website: http://www.mikx.de/scrollbar/

Dragging the window scrollbar is a common behavior - even if i can't believe there was a world before mouse wheels. A common user will probably don't recognize the installation at all.

Speaking of behaviors: If service pack 2 is installed you can work around this vulnerability by disabling "binary behaviors" in the new IE activex settings. You don't need to disable scripting completely.

It took me only 20 minutes to create this, so script kids around the world with enough free time will create even better protected mechanisms to exploit this bug in the near future.

Take it serious!

mikx

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