If you’re using a WiFi-enabled computer, then better check on your settings. Microsoft has confirmed that the ad-hoc networking feature of Windows 2000, XP and 2003 is vulnerable to attacks when left unguarded.

The threat exists once you set up an ad-hoc or peer-to-peer connection (i.e. without a WiFi infrastructure or access point). Your system starts to re-broadcast the SSID (the wireless network ID), which can then be picked up by other WiFi users or systems. Cool idea, right? You can wirelessly network even without an Access Point. Well, not exactly.

Problem is, your wireless-enabled computer or laptop continues to broadcast the SSID even when the ad-hoc network has been disconnected. Your system is now practically an open-access WiFi hotspot (if the ad-hoc network was not set up to be encrypted in the first place). Hackers and malware can now take advantage of this flaw and connect to your PC as if it were in a local area network–and third parties can gain access to your files, printers, and settings.

How to protect yourself? Easy. Simply set your system to access “Access point (infrastructure) networks only” by opening your wireless network’s Property sheet and clicking on Advanced options.

Of course, it pays to have your Windows Firewall enabled, and your system up-to-date with the latest service pack and patches.

Microsoft says users who have their Windows Firewalls activated and who regularly update are at less risk. MS will be releasing patches for this particular vulnerability in the next Patch Tuesday.

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