As part of the attack, the anonymous researchers obtained a signature certificate from VeriSign for a company named Apple Computer
You have to fool VeriSign first, just like any other SSL man-in-the-middle attack, so I guess it depends on what you call easy.
Actually, as stated in the original blog post liked from the article, it was a demo signature certificate for a person named "Apple Computer". Such certificates are offered by VeriSign without validation. The problem is that the iPhone trusts such certificates, and that it doesn't make it clear that it isn't a validated organization name it publishes.