While it would be great for Apple to release a fix, this is just the latest incarnation of this LONG standing issue. The ultimate fix for this is to have Microsoft patch this clear vulnerability in the ActiveSync code in Exchange (this has been going on since at least Exchange 2003). If they patch this, it only takes care of those Apple devices and I'm sure this is coming from other vectors as well, plus we have to rely on people upgrading their devices including people outside of our company, so it's not a real fix.
This issue in the corporate space usually generates the highest visibility because the issue is related to delegates, usually execs and is a nightmare. I am happy that the latest blowup of this has raised the attention of both vendors to hopefully get this fixed once and for all.
Microsoft, please fix this soon.