Good morning,
Unfortunately, the real answer is "it depends" and I know you hate hearing that! I'll put forward a couple of options below. Some might be more likely, some less likely, some might not even match your goals. But they'll at least give you the option to pick the ones that do align and we can discuss those in more detail.
Before I do that, one of the most difficult pre-MBA careers to switch out of is generally IT. Some of this is rooted in stereotype (which may be very accurate depending on the type of IT you do) and the exposure you probably had to larger business problems. Unless you're one of the few that did strategy within IT, most of what a recruiter would think probably isn't that far off the mark. So essentially, wherever you want to switch to, you have to make a case. And that case is, "compared to that other guy over there who was already finance or ex-consulting or in a general position at a business, this is why you should pick me". You can make that case in a few different ways:
Personal network: sure, MBA programs have a great established recruiting process but if you feel you can't quite make the case above when compared to your entire graduating class, do you have a strong enough personal network to get you staffed where you want to be? The answer to this could easily be no - at this stage in your career your network, even if strong relatively, is still starting out. It's possible, however, that you have a few highly placed people you know in finance. That could be an option.
MBA network: there are many ways to plug into the MBA network. Unfortunately, with the 1 year program, these options are inherently limited. So for example, two great options are clubs focused on finance (they may host speakers, hold events, etc.) or working directly with professors within that field (helping them with research or being a TA). Both of these strengthen your exposure and establish you as someone not messing around. Essentially, it serves to differentiate your resume in the eyes of the recruiter either through academic dedication or through sheer number of interactions.
Career Fair: last, but not least, is the standard route. You go to the career fairs your school hosts. Here, your resume must make the case for why you versus the stack of other resumes. The clearest way to make a strong case for the "career switch" story is to say, "I'm really dedicated, look at this internship and how cool it was and all the things I learned!".
If you want to go into corporate finance, you might be ok with a 1 year program using one or some combination of the above options. However, if you're looking at investment banking, PE, or hedge funds, then no. Your chances diminish drastically in a one year program. Sorry, not trying to be negative but that's the truth.
So - which path are you looking at?
Bhavik