Well, my response from MT (after 20hours) was as to be expected:
(mt) Media Temple has done everything it can to keep the (gs) as secure as possible, and we roll out security updates to our servers as they become available. However, when there’s a vulnerability in the site software (CMS, Blog, Shopping Cart, etc) that is being used, having the most secure server in the world (I’m not saying the (gs) is; I’m just using this as an example) hosting that site won’t prevent the site from being hacked/exploited.
I am quite annoyed right now. It seems that MT is simply ignoring the issue.