"persistent bios infection" paper and openbsd

[Didier Wiroth]

Hello,
I've read this a few minutes ago. I'm not a developer, nor a security 
specialist so I was wondering if that is a serious issue for Openbsd.
http://i.zdnet.com/blogs/core_bios.pdf
As far as I understood, they mention the "Openbsd shadow files" as being 
vulnerable/exploitable to these kind of attacks, have a look at Page 17.
Kind regards,
Didier