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16 Revoke PUBLIC permissions where not needed
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Many of the built-in stored procedures and functions in a database are granted to the PUBLIC group by default Each database has a slightly different implementation of a PUBLIC group generically, it represents everyone in the database This means that permissions granted to PUBLIC apply to everyone This has led to many security issues in databases Many of the built-in procedures may not appear dangerous and have no practical use for ordinary users Security best practices dictate that you should restrict all access unless explicitly needed If a procedure contains functionality that is not needed, it should not be granted to any users This is especially important for permissions granted to PUBLIC Remember that if you revoke permissions that are needed, you may end up breaking necessary functionality Blindly revoking all PUBLIC permissions is a recipe for disaster
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9: Auditing Databases
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Start by gathering a list of all permissions, highlighting those granted to PUBLIC Discuss with the DBA which procedures and features of the database are being used or may be used in the future Then determine how much risk would be introduced by revoking permissions from objects that are clearly not needed If everyone agrees to have the permissions revoked, it makes sense to revoke them Always make a backup and provide an undo script that can be used to roll back any changes if you later determine that you need those permissions or something unexpectedly breaks
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PART II
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Data encryption is applied to three distinct areas, or states Data in motion describes data in transit across the network and is often encrypted using protocols such as Secure Sockets Layer (SSL) Data at rest describes data resident on storage, such as inside a database, and can be encrypted with a number of algorithms such as the Advanced Encryption Standard (AES) Data in use describes data processing in applications
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17 Verify that network encryption is implemented
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Network encryption serves two main purposes: to protect authentication credentials as they move across the network and to protect the actual data in the database as it moves over the network The network is not a secure environment IP addresses can be spoofed, and network traffic can be redirected and sniffed It is critical that network traffic be encrypted not just over the external network but also on your intranet
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Verify that the network and client drivers have been configured to support encrypting network traffic using protocols such as SSL Verify settings at both the client and the database In some cases, you may need to sample the traffic to demonstrate the encryption
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18 Verify that encryption of data at rest is implemented where appropriate
Encryption of data at rest involves encrypting data as it is stored in the database Arguably, encryption of data at rest is more important than other forms of encryption, because the lifetime of data on disk or in the database is much longer than the lifetime of data on the network If you look at where data is most likely to be stolen, you ll see that it is stolen directly from the database while at rest and not while traversing the network
Verify that data that should be encrypted is encrypted properly Also review the location where the encryption keys are stored, because the strength of encryption relies on the strength of protection of the encryption keys If the encryption keys are stored with the encrypted data, an attacker can subvert the security simply by extracting the encryption keys
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Check the disaster recovery plan to ensure that encryption key management is included as a component A mistake you do not want your DBA to make is to implement encryption features but fail to include key management in the backup procedures Failing to back up encryption keys properly results in the inability to recover a database backup
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