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What are the best practices for a Debian Squeeze + Grsecurity/PAX based system when multiple, and therefore insecure, websites must run on the same server? I mean how can I mitigate an attack, so that if UserX's website got hacked, the other hosted sites remain intact etc.? Are there any good guides on this topic?

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I would start by reading http://wiki.apache.org/httpd/PrivilegeSeparation

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