The costs of a root-level security breach can be devastating, however. According to CERT , compromised machines must be disconnected from the network, their drives wiped, and their OS software reinstalled from clean media. Any data restored from backups must be carefully scrutinized to prevent reintroduction of backdoors or viruses. Finally all associated machines must also be scoured for any signs of intrusion. CERT does point out one silver lining to this cloud.
Nobody wants to go through that twice.
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