Detailed exploit instructions for a critical Windows update have been published on the Internet.

The code exploits a known and patched vulnerability in the Windows DHCP Client service.

Microsoft released bulletins on 11th July to correct the flaw.

As this is vulnerability has been patched you only have yourself to blame if you get infected by something based on the exploit code that has been published. If you are not up to date then get patching.

See http://isc.sans.org/diary.php?storyid=1509