The ignorance of the MCSE.
"Unix security inherited by Linux was developed in a friendly academic environment and for a single machine only."
Whilst *nix can be run in a single user mode, it has from early versions in Bell labs been multi-user, decades before windows even existed
"A Linux user can be member of a single group only."
This would be news to every Linux user, but is wrong.
"A file can have a single owner and belong to single group only"
Sure if Linux file systems didn't supported extended attributes, they do. And they're no kludge and work perfectly across networks.
"Practically nothing else is securable"
No idea of what mandatory access control systems like SELinux is.
The end with the typical superficial analysis of vulnerabilities. All the MCSE ignorance boxes checked.
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