Mainframe security

[Peter . Kunz]

Hi folks,

I'd like some info on mainframe security:
What vulnerabilities (classes) exist on a classical mainframe?
What new vulnerabilities do I introduce when running Unix services or TCP/IP
(IBM OPEN MVS?)?
is the any advantager ro running a FW on a mainframe?

Also of interest is the same discussion for minis, aka AS/400.

Thanks.

cu
-pete
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