Tecchannel's report available in English here, or in German here) demonstrates that WPA can be compromised via numerous hardware-related routes; it all centres on the file wpa.dbl, which WinXP keeps in the system32 directory.

This file stores information on the nature of the hardware at the time of activation, and when Windows XP notices more than three items of hardware have changed, it deletes it. Then you need to activate again. You'll also, Tecchannel notes, need to activate immediately if you installed more than 30 days (or 14 with RC1) ago, as that's when the clock starts ticking. This, incidentally, is also the case if you do a 'repair' to fix a bust system - not exactly friendly.

So first of all Tecchannel saved the file then started changing hardware. Two items OK, but replacing a third - the CPU - triggered the deletion. Although you'd think the CPU is only one component, it's actually tallied up as two. Switching off the CPU serial number in the bios and therefore knocking it down to one doesn't get the earlier wpa.dbl back - this has been restored in a non-activated state.

Copy the saved version back? That surely shouldn't work - but it does. Next, Tecchannel tried a completely new installation using the same product key. This produces a new product ID, but nevertheless copying the wpa.dbl file back again works.

They also use this file on another computer, altering the computer's volume ID first, which is easily enough done. They can also use forged network cards MAC addresses, so now they've taken two parts of the hardware ID out of the picture. Next, use the hardware profile to tell the computer it's a notebook with a docking station. This works, and tells WPA to stop counting the IDE/SCSI controller and the graphics card.

That gets the differences counted down to three, hard disk, CPU and CDROM ID, which is within the limit, so WPA is effectively toast.

What does this mean? Tecchannel's investigation shows that, at the very least, you can use the same wpa.dbl file to activate as many computers as you like, provided the RAM size is the same. A 'universal' file that didn't even require the same RAM might be a possibility, but it's more likely that people will simply swap files to get one appropriate for their hardware. If Microsoft doesn't change WPA before WinXP ships, then it's pointless. But changing it when RC2 is looming, and when the holes are so obviously huge, would be difficult.

So farewell then, Windows Product Activation - for the moment?

The Register

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