I'm not sure you fully understand what you're asking.
AmigaOS by default has no network stack. Therefore by default it has no network services.
Once you add a stack, you can have vulnerabilities in the stack. Once you add software/services to use the stack, you can have vulnerabilities in those too, including the IP filter or firewall software. None of these say anything about the security of the operating system. The only fault of AmigaOS in this context therefore is that it has no memory protection*. However if any operating system has a vulnerability in the stack that is remotely exploitable, the operating system is almost certainly going to be fully exploitable.
- Where can I find information about expolits in AmigaOS and apps?
Try searching the bugtraq archives? I doubt AmigaOS software get many mentions, but that's the only central place I can think of.
- Does anyone have any thoughts on which AmigaOS stack is overall most secure?
I doubt any of the available stacks have a bad reputation. I think I've heard of a single vulnerability in each of them.
My own discoveries: MiamiDx is very easy to flood . Just:
ping -l (from unix system) 100000 |amiga ip|.
I did a bit of testing myself once, I wasn't able to make Miami 3.2b crash. I did however slow my Amiga to a virtual halt when I had it logging and displaying traffic during a complete port scan. Poor little 040 and PIO0. :-)
* - WARNING everyone. Do not start an argument about memory protection.
