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Absolute OpenBSD, 2nd Edition by Michael W. Lucas

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Security researchers, programmers, and skilled intruders continuously discover new ways to penetrate previously secure systems. Although OpenBSD has suffered only two vulnerabilities in a default installation that permitted an intruder to compromise the system, that doesn’t mean that a two-year-old OpenBSD version is secure.

The OpenBSD Project provides security updates for only the two most recent releases. For example, when OpenBSD 5.3 comes out, OpenBSD 5.1 will be “end-of-lifed” and lose support from developers. If someone figures out how to break into a default OpenBSD 5.1 installation after 5.3 comes out, the developers might not provide fixes. You might adjust new security patches to work on ...

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