http-equiv has discovered a vulnerability in Microsoft Internet Explorer, which can be exploited by malicious people to compromise a user's system.
The vulnerability is caused due to insufficient validation of drag and drop events issued from the "Internet" zone to local resources. This can be exploited by a malicious website to e.g. plant an arbitrary executable file in a user's startup folder, which will get executed the next time Windows starts up.
http-equiv has posted a PoC (Proof of Concept), which plants a program in the startup directory when a user drags a program masqueraded as an image.
mikx has posted a similar PoC, which plants a program in the startup directory when a user uses the scrollbar.
Andreas Sandblad, Secunia Research, has developed a PoC, which only requires a single click on systems running Windows XP SP1.
This vulnerability is a variant of an issue discovered by Liu Die Yu. SA9711
The vulnerability has been confirmed on a fully patched system with Internet Explorer 6.0 and Microsoft Windows XP SP1/SP2.
NOTE: The vulnerability is actively being exploited in the wild.
Solution: Microsoft has issued patches (see vendor advisory or SA12806).
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Subject: Microsoft Internet Explorer Drag and Drop Vulnerability
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