How safe is it to buy Linux distributions on ebay

[Rajiv Vyas]

People have talked about backdoor on Win XP. I was wondering: How safe
is it to buy Knoopix, Ubuntu or other distros on ebay? Could a smart
hacker emabde a script that could secretly export your personal info?
These questions came to my mind as I am finding it almost impossibe to
burn CDs on Ubuntu and have been thinking about buying something on
the ebay.

Thanks,

Rajiv