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Databases are especially vulnerable to insider attacks because:
Two different entities (DBA's and Sys Admins) can access files.
The data is unencrypted in the database
The data that is housed is attractive and valuable.
The disk storage systems are separated from the hosts, making it possible to remove them.
Due to the fact that system administrators have ubiquitous access to the file systems that house DB files, and DBA's have complete access to the database themselves, there are 2 potential vectors for attack on these critical information systems. Yes, the data is attractive and valuable, which is what makes having 2 entities with access particularly worrysome. The disks could potentially be stolen, but the theft of the disk themselves would be an overt act, easily discovered and requiring substantial technical resources to reconstruct the file systems. The data may actually be encrypted on the DB disks, which would mitigate a number of issues.
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