vBulletin won't (or shouldn't) suffer from such attacks, however the same cannot be guaranteed for modifications. (Although modifications with such flaws are normally pulled from vBulletin.org as soon as they are reported).
I'd check any other scripts you have on your site that are not vBulletin.
Just googling "Prevent SQL Injections" will give you tutorials on how to protect any other scripts which may be vulnerable.
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