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Each database vendor has a slightly different implementation of the various database components However, the theories and principles apply to all the different platforms fairly universally We will cover enough of these basics to give you a bird s eye view From there, you should have enough background to follow a technical guide on a specific database platform Following are the major pieces of the database that you will need to understand as an auditor
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A database is implemented as a software system, and as such, it comprises a core set of operating system files These files include the executable files that will run the database management system It also may contain other nonexecutable program files such as help files, source and include files, sample files, and installation files These files should be protected, because the database relies on their integrity They should be guarded from any form of modification particularly any executable files Access controls should be as restrictive as possible on the directory that holds these files Ideally, only database administrators should have access to this directory
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Databases rely heavily on configuration settings to determine how the system operates Protecting these settings is important, because if the configuration can be manipulated, security can be subverted Configuration values reside in a variety of places, including the following: In operating system text files In the data files On Windows, stored in the registry In environment variables Configuration values are used for a wide range of settings, such as these: Setting the type of authentication or trust model Setting which groups are database administrators Determining password management features Determining the encryption mechanism used by the database Verifying the integrity of configuration values is a critical component of any audit
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Databases need to store the data they hold in physical operating system files that typically comprise a series of files The format of the files is typically proprietary, and the data files contain information such as the following: Data being stored Pointers from one field to the next field or from one row to the next row Index data, including pointers from the index to the physical data NOTE Indexes contain a subset of the data to which they point This means that if an attacker can access the index, he or she may not need access to the physical data itself Ensure that access to any index is protected to the same degree as the data itself Usually, the database dictionary is stored in these data files, so any access to these files can be used to circumvent controls built into the database
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An important component of any database system is the client Typically, the client is located on a remote system from the database The client also can connect from the local system, which is frequently the case with batch processes In order for a client to connect to the database, a client library or driver is required on the client s machine This usually consists of a set of executables such as DLLs and
9: Auditing Databases
shared objects, as well as an API that the client can use to connect to the database The client libraries are hard to protect because they usually exist on remote systems where access controls are much more difficult to maintain However, it is very important to maintain the integrity of the client drivers in locations from where administrators or even regular users will be connecting One weak point in the security model is the integrity of the client libraries If the client drivers can be manipulated, credentials can be stolen fairly easily Client drivers can be trojaned, or even something as simple as a keyboard logger on the client system can lead to a compromise of the database Communication over the network also requires network drivers on the database These drivers are another point of focus for the auditor, because they are the avenue that the attacker will use to access the database
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