My entire family own Windows boxes, and the internal IP is dynamic most of the time. Now what i didnt realize was that my sister opened DMZ onto her internal IP at the time so she could get a decent download speed over torrent.
The next time i turned my Ubuntu box on, it got that IP, and thus all the traffic got forwarded straight to my laptop, exposing all of my ports (including 139) I dont turn my box off very often either, it usually stays on and connected to the internet for quite sometime. I only realized when somebody contacted me over MSN and told me that they had managed to access my entire user area, i then checked /var/logs/samba and found a lot of requests from external IP addresses.
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